CN115522154B - Stabilizer bar, preparation method thereof, suspension assembly and vehicle - Google Patents

Abstract

The invention discloses a stabilizer bar, a preparation method thereof, a suspension assembly and a vehicle, wherein the stabilizer bar comprises a bar body and an anti-corrosion layer, the anti-corrosion layer is arranged on the surface of the bar body, the anti-corrosion layer comprises a surface layer, and the surface layer comprises the following components in percentage by mass: 5-12% of Si and 85-95% of Al. According to the technical scheme, the corrosion resistance of the stabilizer bar is improved through the silicon-aluminum content of the surface layer in a specific proportion, corrosive substances such as sewage, grease, rainwater and the like in the external environment are effectively isolated, the bar body of the stabilizer bar is prevented from being corroded, the corrosion resistance of the stabilizer bar is effectively ensured, the stabilizer bar is prevented from being corroded, the service life of the stabilizer bar is prolonged, and the potential safety hazard of an automobile is eliminated.

Description

Stabilizer bar, preparation method thereof, suspension assembly and vehicle

Technical Field

The invention relates to the technical field of stabilizer bars, in particular to a stabilizer bar, a preparation method thereof, a suspension assembly and a vehicle.

Background

Stabilizer bars, also known as stabilizer bars or anti-roll bars, are one of the important parts of automobiles. When the vehicle turns to and causes the car body to roll, the suspension frames at two sides are inconsistent in jumping, the stabilizer bar is twisted, the torsional rigidity of the stabilizer bar prevents the car body from continuing to roll, so that the amplitude of the car roll is reduced, the car body is more stable when the car turns, and the steering stability when the car turns is greatly improved.

Because the use environment is changeable and abominable, the stabilizer bar often contacts with sewage, greasy etc. substances, even acid rain contacts, leads to the stabilizer bar to be corroded, causes the life of stabilizer bar to reduce, has the potential safety hazard to the normal operating of car.

Disclosure of Invention

The invention mainly aims to provide a stabilizer bar, a preparation method thereof, a suspension assembly and a vehicle, and aims to improve the corrosion resistance of the stabilizer bar.

In order to achieve the above purpose, the stabilizer bar provided by the invention comprises a bar body and an anti-corrosion layer, wherein the anti-corrosion layer is arranged on the surface of the bar body and comprises a surface layer, and the surface layer comprises the following components in percentage by mass: 5-12% of Si and 85-95% of Al.

In one embodiment, the corrosion protection layer further comprises a diffusion layer, wherein the diffusion layer is positioned between the surface layer and the rod body; the diffusion layer comprises the following components in percentage by mass: 70-80% of Al,8-15% of Si and 10-20% of Fe.

In one embodiment, the total thickness of the corrosion protection layer and the diffusion layer is 20-30 μm.

In an embodiment, the rod body is hollow, the anti-corrosion layer is arranged on the inner surface and/or the outer surface of the rod body, and the stabilizer further comprises an electrophoresis layer, and the electrophoresis layer is positioned on one surface of the anti-corrosion layer away from the rod body.

In one embodiment, the anti-corrosion layer is disposed on the surface of the rod body by hot dip plating.

In one embodiment, the rod body comprises the following components in percentage by mass: c:0.33-0.37%; si:0.15-0.30%; mn:1.20-1.40%; cr:0.020% -0.040%; b:0.003-0.006%.

The invention also provides a preparation method of the stabilizer bar, which comprises the following steps:

arranging an anti-corrosion coating on the surface of the rod body;

preserving heat for a preset time for the rod body after the anti-corrosion coating is prepared, so that the anti-corrosion coating is alloyed with the rod body; wherein the heat preservation temperature is 930+/-15 ℃, and the preset time is more than or equal to 15min;

putting the alloyed rod body into quenching liquid, cooling to below 200 ℃, and tempering to obtain a surface layer on the rod body, wherein the surface layer comprises an anticorrosive layer containing 5-12% of Si and 85-95% of Al; wherein the tempering heat preservation temperature is 320+/-10 ℃, and the heat preservation time is more than or equal to 60 minutes.

In one embodiment, the preparation of the anti-corrosion coating on the surface of the rod body comprises the following steps:

s1, immersing a rod body into a container containing plating solution for hot dip plating; wherein, the plating solution comprises the following components: 8-15% of Si, 70-80% of Al and the balance of Fe; the process temperature of the hot dip plating is controlled at 620+/-10 ℃;

s2, cooling to room temperature after hot dip plating so as to prepare the anti-corrosion coating on the surface of the rod body.

The invention also provides a suspension assembly, which comprises a stabilizer bar, wherein the stabilizer bar comprises a bar body and an anti-corrosion layer, the anti-corrosion layer is arranged on the surface of the bar body, the anti-corrosion layer comprises a surface layer, and the surface layer comprises the following components in percentage by mass: 5-12% of Si and 85-95% of Al.

The invention also proposes a vehicle comprising a body and a suspension assembly mounted to the body; the suspension assembly comprises a stabilizer bar, the stabilizer bar comprises a bar body and an anti-corrosion layer, the anti-corrosion layer is arranged on the surface of the bar body, the anti-corrosion layer comprises a surface layer, and the surface layer comprises the following components in percentage by mass: 5-12% of Si and 85-95% of Al.

According to the technical scheme, the anti-corrosion layer is arranged on the surface of the rod body of the stabilizer rod to prevent the rod body from corrosion, so that the anti-corrosion performance of the stabilizer rod is improved. The anticorrosive coating comprises a surface layer, wherein the surface layer comprises the following components in percentage by mass: 5-12% of Si and 85-95% of Al; the special proportion of the silicon-aluminum content of the surface layer plays a role in protecting the rod body, and corrosive substances such as sewage, grease, rainwater and the like in the external environment are isolated, so that the rod body of the stabilizer rod is prevented from being corroded, the corrosion resistance of the stabilizer rod is effectively ensured, the service life of the stabilizer rod is prevented from being reduced due to corrosion, and the potential safety hazard of an automobile is eliminated. In addition, the anti-corrosion layer has extremely high hardness, so that the overall structural strength of the stabilizer bar is increased, the fatigue life of the stabilizer bar is also remarkably improved, and the running stability of an automobile is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of one embodiment of a stabilizer bar of the present invention;

fig. 2 is an enlarged view of a portion of the stabilizer bar of fig. 1.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	Rod body	210	Surface layer
200	Corrosion-resistant layer	220	Diffusion layer

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" is presented throughout this document, it is intended to include three schemes in parallel, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The invention provides a stabilizer bar.

In the embodiment of the present invention, referring to fig. 1, the stabilizer bar includes a bar body 100 and an anti-corrosion layer 200, the anti-corrosion layer 200 is disposed on the surface of the bar body 100, the anti-corrosion layer 200 includes a surface layer 210, and the surface layer 210 includes the following components in percentage by mass: 5-12% of Si and 85-95% of Al.

Specifically, the rod body 100 of the stabilizer rod may be made of a metal material to improve structural strength of the stabilizer rod and prolong the service life of the stabilizer rod. The rod body 100 can be of a solid structure, so that the structural strength of the stabilizer bar is further improved, bending deformation of the stabilizer bar is avoided, the running stability of the automobile is improved, and the comfort of riding the automobile is improved. In another embodiment, the rod body 100 may be hollow, thereby reducing the weight of the stabilizer bar and facilitating the operation of the driver of the automobile.

The structure of the rod body 100 is various, in an embodiment, the rod body 100 includes a torsion bar and torsion arms disposed at two ends of the torsion bar, the two torsion arms are disposed oppositely, one torsion arm can be disposed in an L-shape integrally, and the corner of the torsion wall is in an arc-shaped structure. It is understood that the shape of the two torque arms may be identical. The opposite ends of the torsion bar are connected with two torsion arms and are in a U-shaped structure. The torsion bar and the torsion arm may be identical in shape or different in shape. In one embodiment, the torsion bar and torque arm are provided in varying diameters.

Referring to fig. 1, by providing the anti-corrosion layer 200 on the surface of the rod body 100, the anti-corrosion performance of the stabilizer bar is improved, the shot blasting process can be eliminated, the inner surface of the rod body 100 does not need to be subjected to anti-corrosion treatment, the processing process is reduced, the energy is saved, and the carbon emission is reduced. The anti-corrosion layer 200 comprises silicon and aluminum, so that the anti-corrosion layer 200 has extremely high hardness and impact resistance, the fatigue life of the stabilizer bar is remarkably improved, and the service life of the stabilizer bar is further prolonged; meanwhile, the anti-corrosion layer 200 of silicon and aluminum is adopted, so that the anti-corrosion layer 200 has excellent high temperature resistance, and no oxidation and falling and decarburization are generated during hot working.

The anti-corrosion layer 200 is arranged on the surface of the rod body 100, and before hot working, the anti-corrosion layer 200 comprises pure Al phase, a small amount of Si-rich phase and a small amount of Fe-Al-Si ternary alloy; after hot working, the entire stabilizer bar is austenitized, fe-Al-Si diffuses, and the corrosion-resistant layer 200 undergoes a structural transformation to form a Si-rich phase and a Fe-Al-Si ternary alloy phase.

The corrosion-resistant layer 200 can be iron (Fe) except silicon and aluminum, and the proper silicon content is beneficial to forming a relatively continuous matrix by ternary Al-Fe-Si phase, so that holes generated in the corrosion-resistant layer 200 on the surface of the rod body 100 are reduced, the surface roughness of the corrosion-resistant layer 200 is reduced, and the corrosion resistance and the post-treatment are beneficial; when the silicon content is increased to 12%, the thickness of the anti-corrosion layer 200 is significantly reduced, resulting in an increase in the number of holes and a larger diameter of the anti-corrosion layer 200, and a reduction in the anti-corrosion performance of the anti-corrosion layer 200.

According to the technical scheme, the anti-corrosion layer 200 is arranged on the surface of the rod body 100 of the stabilizer rod to prevent corrosion of the rod body 100, so that the anti-corrosion performance of the stabilizer rod is improved. The anti-corrosion layer 200 comprises a surface layer 210, wherein the surface layer 210 comprises the following components in percentage by mass: 5-12% of Si and 85-95% of Al; through the silicon-aluminum content of the surface layer 210 in a specific proportion, the corrosion resistance of the stabilizer bar is enhanced, corrosive substances such as sewage, grease, rainwater and the like in the external environment are isolated, the bar body 100 of the stabilizer bar is prevented from being corroded, the corrosion resistance of the stabilizer bar is effectively ensured, the reduction of the service life or the deterioration of the mechanical property of the stabilizer bar due to corrosion is prevented, and the potential safety hazard of an automobile is eliminated. In addition, the surface layer 210 has extremely high hardness, so that the overall structural strength of the stabilizer bar is increased, the fatigue life of the stabilizer bar is also remarkably improved, and the running stability of the automobile is further improved.

Referring to fig. 1 to 2, in an embodiment, the stabilizer bar further includes a diffusion layer 220, and the diffusion layer 220 is located between the surface layer 210 and the bar body 100. The diffusion layer 220 may be an alloy layer, which may be formed by interaction between the surface layer 210 and the rod body 100, and the diffusion layer 220 has strong corrosion resistance and can isolate corrosive substances in the external environment, thereby further improving the corrosion resistance of the stabilizer rod and prolonging the service life of the stabilizer rod.

Further, in one embodiment, the diffusion layer 220 comprises the following components in mass percent: 70-80% of Al,8-15% of Si and 10-20% of Fe. The iron (Fe) of the diffusion layer 220 may be carried by the rod body 100 itself, and the rod body 100 is diffused into the diffusion layer 220 after reacting with the corrosion preventing layer 200. The diffusion layer 220 includes an Fe-Al alloy layer, and after the corrosion protection layer 200 and the rod body 100 are thermally processed, the stabilizer body structure is transformed from ferrite + pearlite to a martensitic structure, and the Fe-Al alloy layer of the diffusion layer 220 is transformed to an Fe-Al phase.

The diffusion layer 220 contains elemental aluminum, silicon, and iron, including metallic elemental aluminum and iron, and non-metallic elemental silicon. The aluminum, silicon and iron of the diffusion layer 220 have good corrosion resistance, good high temperature resistance and extremely high hardness, and further improve the structural strength of the stabilizer bar.

If the thickness of the anti-corrosion layer 200 is too small, it is easily corroded by corrosive substances, so that the rod body 100 is exposed, and the anti-corrosion effect is poor; if the thickness of the anti-corrosion layer 200 is too large, the material energy consumption is large, the production cost of the product is increased, and the environmental protection is not facilitated. In one embodiment, the thickness of the anti-corrosive layer 200 is 20-30 μm. The hardness of the coating of the surface layer 210 and the diffusion layer 220 on the surface of the rod body 100 may be less than or equal to 100HV. In one embodiment, the thickness of the surface layer 210 is in the range of 17-23um.

To further enhance the corrosion resistance of the stabilizer bar, in one embodiment, the stabilizer bar is subjected to an electrophoresis treatment, so that an electrophoresis layer is disposed on a surface of the surface layer 210 facing away from the bar body 100, and the electrophoresis layer has the corrosion resistance. By adopting electrophoresis treatment, the anti-corrosion performance of the stabilizer bar is improved, the production and manufacturing cost is reduced, the operation is simple, and the formed electrophoresis layer is thin.

It is understood that the electrophoretic fluid for the electrophoresis treatment may be a general electrophoretic fluid, so long as an electrophoretic layer is formed on the surface of the surface layer 210. In one embodiment, the thickness of the electrophoretic layer is in the range of 7-15um.

Referring to fig. 1, in an embodiment, the rod 100 is hollow, and the anti-corrosion layer 200 is disposed on an inner surface and/or an outer surface of the rod 100.

With continued reference to fig. 1, by arranging the rod body 100 to be a hollow structure, the weight of the stabilizer bar is reduced, the resonance frequency with the automobile can be avoided, and the comfort of the driving condition is improved. And set up anticorrosive coating 200 at the internal surface or the surface of stabilizer bar, play anticorrosive effect to body of rod 100, prolonged the life of stabilizer bar, promote the reliability of product.

The anti-corrosion layer 200 may be disposed on an inner surface, an outer surface, or both the inner surface and the outer surface of the rod body 100. In an embodiment, the inner surface and the outer surface of the rod body 100 are provided with the anti-corrosion layer 200, so that the anti-corrosion performance of the stabilizer bar is further improved, and the service life of the stabilizer bar is prolonged.

In the related art, the inner surface of the rod body 100 is generally treated by injecting wax, but the stabilizer cannot design a wax injection hole, and manual wax injection is needed to be implemented at the sealing position of the earring of the stabilizer, so that the efficiency is low, the wax injection amount cannot be ensured, and the anti-corrosion effect is poor. According to the invention, the anti-corrosion layer 200 is arranged on the inner surface of the rod body 100, so that manual wax injection operation is not required, and the anti-corrosion performance of the anti-corrosion layer 200 is excellent.

The anticorrosive layer 200 may be disposed on the surface of the rod body 100 by spraying or by brushing. In one embodiment, the anti-corrosion layer 200 is provided on the rod body 100 by hot dip plating.

Hot dip plating is a method of immersing a base metal in a molten metal liquid to form a metal plating layer on the surface thereof. Specifically, a metal plating layer is formed on the surface of a base metal by immersing the base metal to be plated in molten plating metal, and then taking out and cooling. The surface layer 210 is formed on the surface of the rod body 100 by putting the rod body 100 into a molten aluminum silicon metal liquid and then taking out the rod body 100, so that the surface layer 210 is firmly adhered to the surface of the rod body 100. The hot dip plating is simple in operation, shortens the time of the processing procedure, and is beneficial to mass processing production of products.

The rod body 100 is made of various materials, and in one embodiment, the rod body 100 is made of steel, the corrosion-resistant layer 200 is disposed on the rod body 100 by hot dip plating, so as to form an alloy layer between the surface layer 210 and the rod body 100, and the alloy layer is the diffusion layer 220. The steel has larger strength and durability, and the rod body 100 prepared by the steel has large structural strength, which is beneficial to the structural stability of the stabilizer rod. The steel material can be carbon steel or spring steel, and is specifically selected according to actual conditions. The rod body 100 made of steel may be a seamless steel pipe.

Further, in an embodiment, the rod 100 comprises the following components in mass percent: c:0.33-0.37%; si:0.15-0.30%; mn:1.20-1.40%; cr:0.020% -0.040%; b:0.003-0.006%.

The carbon (C) contributes to the improvement of mechanical strength and hardness, maintains the mass of carbon at 0.33% -0.37%, ensures the rod body 100 to have good mechanical strength and hardness, and improves corrosion resistance according to the precipitation of carbide. Manganese (Mn) can improve hardenability and mechanical strength, on one hand, the mass of Mn is controlled to be 0.50% or more, and good mechanical strength and hardenability can be ensured; on the other hand, the Mn content is controlled to 1.40% or less, whereby the corrosion resistance can be improved. Chromium (Cr) can improve strength, corrosion resistance, and hardenability. The boron (B) can improve the hardenability, the mechanical strength and the like, and on one hand, the quality of the boron is controlled to be between 0.003 and 0.006 percent, so that the boron-containing alloy has good hardenability, and the toughness and the corrosion resistance can be improved.

In one embodiment, the rod body further comprises the following components in percentage by mass: p is less than or equal to 0.015 percent; s is less than or equal to 0.005 percent. Phosphorus (P) is an unavoidable impurity remaining during steel making, and the phosphorus quality is controlled to be 0.0015% or less, so that the problems of deterioration of toughness and corrosion resistance due to segregation can be prevented. Therefore, the quality control of phosphorus is better at 0.0015% or less. Elemental sulfur (S) is also an unavoidable impurity remaining during steel making, and the sulfur quality is controlled to 0.005% or less, so that problems of deterioration in toughness and corrosion resistance due to segregation and inclusions can be prevented. The addition of a proper amount of Cr element and B element into the rod body 100 can improve the hardenability of the rod body 100, ensure that the hardness of the core part of the stabilizer rod can meet the requirements, and strictly control the content of P, S and other harmful impurity elements.

It should be noted that, the surface of the anti-corrosion layer 200 away from the rod body 100 may be provided with a protection layer, and the protection layer may be a metal coating or a non-metal layer. The protective layer can cover the surface of the anti-corrosion layer 200, and the protective layer can have an anti-corrosion effect, so that the anti-corrosion layer 200 is protected, the anti-corrosion performance of the stabilizer bar is further improved, and the service life of the stabilizer bar is prolonged.

The following description will be made with respect to an embodiment in which the anti-corrosive layer 200 is provided on the rod body 100 and then bending is performed.

The invention also provides a preparation method of the stabilizer bar, which comprises the following steps:

providing an anti-corrosion coating on the surface of the rod body 100;

preserving heat of the rod body after the preparation of the anti-corrosion coating for a preset time to enable the anti-corrosion coating to be alloyed with the rod body 100; wherein the heat preservation temperature is 930+/-15 ℃, and the preset time is more than or equal to 15min;

after the alloyed rod body 100 is placed into quenching liquid to be cooled to below 200 ℃, tempering treatment is carried out so that the surface layer on the rod body 100 comprises an anticorrosive layer 200 with 5-12% of Si and 85-95% of Al; wherein the tempering heat preservation temperature is 320+/-10 ℃, and the heat preservation time is more than or equal to 60min

Before the preparation, heating and heat preservation, a material preparation operation can be performed, and the rod body 100 is cut off and cut according to the actual size requirement. Before or after cutting, a corrosion-resistant coating may be provided on the surface of the rod body 100. Then, a box-type furnace or an induction heating furnace can be adopted to heat the rod body 100 provided with the anti-corrosion coating, at the moment, the heat preservation temperature is 930+/-15 ℃, and the heat preservation time is more than or equal to 15 minutes. When the heating forming is adopted, the rod body 100 can be subjected to the heating forming, and the surface of the rod body 100 is provided with the anti-corrosion coating, so that the surface of the rod body 100 has no decarburization and oxidation phenomenon, and the anti-corrosion performance is strong. It is understood that the bending process of the rod body 100 may also be performed by using a cold roll forming process.

And rapidly cooling the heat-preserving rod body 100 to below 200 ℃ in quenching liquid, and tempering by adopting a mesh belt tempering furnace, wherein the tempering heat-preserving temperature is 320+/-10 ℃, and the heat-preserving time is more than or equal to 60 minutes. After tempering treatment, the stabilizer bar is obtained. After the rod body 100 is subjected to thermal insulation and thermoforming, waste heat is utilized for quenching and low-temperature tempering treatment, so that the production cost and carbon emission are reduced.

When the rod body 100 provided with the anti-corrosion coating is molded in a heat preservation way, the heating temperature is 930+/-15 ℃, the rod body 100 and the die are softened to a certain extent, and further reaction diffusion is carried out between the anti-corrosion coating and the rod body 100 to generate a ternary eutectic group, so that the anti-corrosion coating is hardened, and the anti-corrosion layer 200 is formed on the surface of the rod body 100. The whole rod body 100 is austenitized, and the anti-corrosion coating structure is transformed to form a Si-rich phase and an Fe-Al-Si ternary alloy phase, so that the rod body 100 is protected, the inner surface of the rod body 100 is not required to be subjected to anti-corrosion treatment, shot blasting treatment is cancelled, the consumed time is short, the influence on the environment is reduced, and the environment is protected; and the production procedures are reduced, and the production efficiency is improved. Compared with the method of coating the inner surface of the rod body 100 after shot blasting, the method is simpler and more convenient in technical implementation, simple in operation procedure and low in cost.

In one embodiment, the preparation of the anti-corrosion coating on the surface of the rod body 100 includes the following steps:

s1, immersing a rod body 100 into a container containing plating solution for hot dip plating; wherein, the plating solution comprises the following components: 8-15% of Si, 70-80% of Al and the balance of Fe; the process temperature of the hot dip plating is controlled at 620+/-10 ℃;

s2, cooling to room temperature after hot dip plating to prepare the anti-corrosion coating on the surface of the rod body 100.

Specifically, the container containing the plating solution may be a zinc pot, in which the plating solution is placed, and then the rod body 100 is immersed in the zinc pot for hot dip plating. After hot dip plating, the rod body 100 is cooled to room temperature, thereby forming an anti-corrosion coating on the surface of the rod body 100. It is understood that the cooling may be air cooling. After the anti-corrosion coating is provided, the anti-corrosion coating is converted into the anti-corrosion layer 200 through heat preservation operation.

In one embodiment, before the step of heating and insulating the rod body 100, the method further comprises the following steps: the rod body 100 is heated, and the earrings are cut and punched after being formed. The heating may be performed using an all solid state induction heating device, since the earring forming step requires a lower temperature than the bending step and only requires localized heating, it may be performed prior to the bending step. And, it is not necessary to heat the rod body 100 after bending and forming, so as to avoid reheating the austenitized stabilizer rod, thereby maintaining the body performance of the stabilizer rod. It will be appreciated that the earring is a mounting point and the stabilizer bar may be mounted to other objects via the earring.

After tempering, the rod body 100 may also be subjected to calibration and exterior surface spraying. The spraying of the outer surface may be spraying of a protective material or a corrosion-resistant material. In one embodiment, the stabilizer bar is prepared by a method comprising the steps of material preparation, heating earring forming, heating, forming, waste heat quenching, medium temperature tempering, correction and outer wall spraying.

The invention also provides a suspension assembly, which comprises a stabilizer bar, wherein the specific structure of the stabilizer bar refers to the embodiment, and as the suspension assembly adopts all the technical schemes of all the embodiments, the suspension assembly at least has all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted. Referring to fig. 1, the stabilizer bar includes a bar body 100 and an anti-corrosion layer 200, the anti-corrosion layer 200 is disposed on the surface of the bar body 100, the anti-corrosion layer 200 includes a surface layer 210, and the surface layer 210 includes the following components in percentage by mass: 5-12% of Si and 85-95% of Al. In one embodiment, the suspension assembly may be a subframe of an automobile.

The invention also provides a vehicle which comprises a vehicle body and a suspension assembly, wherein the specific structure of the suspension assembly refers to the embodiment, and the vehicle adopts all the technical schemes of all the embodiments, so that the vehicle has at least all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted. The vehicle can be an automobile, and the automobile can be a small automobile, a truck or a large bus; the automobile can also be a new energy automobile, a gas automobile or other types of automobiles.

Embodiments of the present invention will be described in detail below with reference to specific examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer.

Tables 1 and 2 show the contents of the respective components of the rod body, the surface layer and the diffusion layer on the rod body surfaces (inner and outer walls) of examples 1 to 3 and comparative examples 4 to 5, respectively, and the following groups of examples and comparative examples were subjected to bending processing according to the above-mentioned stabilizer bar manufacturing method to obtain the final forms of the stabilizer bars. Wherein, the outer walls of comparative examples 1 to 3 were subjected to phosphating and spraying treatments, and the inner walls thereof were not provided with an anticorrosive layer.

TABLE 1 rod body Components and their contents (in mass percent)

Sample of	C/％	Si/％	Mn/％	Cr/％	B/％	P/％	S/％
								Example 1	0.36	0.22	1.28	0.030	0.005	0.008	0.002
Example 2	0.34	0.31	1.28	0.028	0.005	0.009	0.001
								Example 3	0.37	0.28	1.32	0.028	0.005	0.005	0.001
Comparative example 1	0.36	0.22	1.28	0.030	0.005	0.008	0.002
								Comparative example 2	0.34	0.31	1.28	0.028	0.005	0.009	0.001
Comparative example 3	0.37	0.28	1.32	0.028	0.005	0.005	0.001
								Comparative example 4	0.35	0.26	1.30	0.029	0.004	0.007	0.001
Comparative example 5	0.34	0.26	1.25	0.029	0.005	0.006	0.001

TABLE 2 Components and contents of anticorrosive coating (in mass percent)

The stabilizer bars (before bending) of examples 1 to 3 and comparative examples 4 to 5 were subjected to electrophoresis treatment, and the total thickness of the anti-corrosion layer and the electrophoresis layer, and the hardness of the bar surface were measured, and the results are shown in table 3 below.

TABLE 3 product thickness and hardness

According to tables 2 and 3, examples 1 to 3 and comparative examples 4 to 5 were subjected to an electrophoretic treatment on the outer surface of the aluminum silicon plating layer, and the total thickness of the electrophoretic layer and the anticorrosive layer in examples 1 to 3 was not greatly different, and was 32 to 37 μm; the thickness of the anticorrosive layer is substantially the same, but the hardness is different. Specifically, in example 1 and example 3, although the thickness of the anti-corrosive layer is the same, the total thickness of the electrophoretic layer, the anti-corrosive layer and the diffusion layer is different, and accordingly the hardness of the rod body surface is different, and the hardness of the surface stabilizer rod is related to the thickness of the electrophoretic layer. In the anticorrosive layers of examples 1 and 3, the contents of silicon element and aluminum element were substantially the same, and the contents of silicon element, aluminum element and iron element in the diffusion layer were slightly different, indicating that hardness was a result of interaction between the elements, and that it was not simple that an increase in one element resulted in an increase in hardness.

Since the outer wall and the inner wall of comparative examples 1 to 3 are not provided with the anticorrosive coating of the present application, the outer wall thereof is subjected to usual process phosphating and spray-molding treatment, thereby obtaining a corresponding anticorrosive coating structure, the thickness of which is 32-36 μm. For comparative examples 4 to 5, the thickness of the electrophoretic layer was in the range of 7-15um, and the corrosion-preventing layer and the diffusion layer exceeded the aluminum, silicon and iron contents of the present application, and the hardness before heating was substantially the same as in examples 1 to 3.

The stabilizer bars (after bending processing) of examples 1 to 3 and comparative examples 1 to 3 were taken respectively to conduct bar hardness, surface hardness, fatigue life and 480 hours neutral salt spray test, and specific test results are shown in table 4 below.

TABLE 4 results of stabilizer bar related Performance test

According to tables 1 and 4, the rod bodies of examples 1 to 3 are different in the respective component contents and have rod body hardness of 50 to 52HRC, i.e., the rod body hardness of the examples is substantially the same; the respective component contents of the comparative examples 1 to 3 were also within the range claimed by the component contents of the rod bodies of the present application, and the hardness of the corresponding rod bodies was 49 to 51, and the hardness of the comparative example rod bodies was not much different from that of the example rod bodies.

As can be seen from tables 3 and 4, the stabilizer bars of examples 1 to 3 were subjected to bending (heating) treatment, and the surface hardness of the bar body was raised from the original 88-92HV to 700-824HV, and since the pre-heating anticorrosive layer 200 contained pure Al phase, al was solid-dissolved, diffused into the bar body 100 and phase-changed after heating, thereby improving the overall hardness of the stabilizer bar. The surface hardness of the rod body is greatly improved, and the surface hardness of the stabilizer rod is higher after bending, so that the hardness of the stabilizer rod is not reduced by heating treatment, but the surface hardness of the stabilizer rod is improved, the structural strength of the stabilizer rod is improved, and the service life of the stabilizer rod is prolonged. Whereas comparative examples 1 to 3 had only 490-539HV, comparative examples 4 to 5 had 780HV and 612HV, respectively, which had higher surface hardness than comparative examples 1 to 3, and were close to those of examples 1 to 3, the stabilizer bars of the present application had significantly higher surface hardness than comparative examples 1 to 3, 5, demonstrating extremely high hardness of the corrosion preventing layer and the diffusion layer of the present application.

In fatigue tests, the fatigue life values of examples 1 to 3 and comparative examples 4 to 5 are 23 to 25 ten thousand times, which are 19 to 21 ten thousand times higher than the fatigue life values of comparative examples 1 to 3, and the stabilizer bar of the application cancels the shot blasting process, but the fatigue life is improved, which indicates that the canceling of the shot blasting process and the setting of the anti-corrosion layer do not reduce the fatigue life of the stabilizer bar, and the stabilizer bar of the application has long service life and high reliability.

The neutral salt spray test was performed on examples 1 to 3 and comparative examples 1 to 5, the corrosion test was performed on the stabilizer bars of each group, and the appearance of the stabilizer bars of each group was observed after 480 hours of neutral salt spray. According to table 4, the inner walls of the stabilizer bars of examples 1 to 3 were not corroded, which means that the corrosion-preventing layer was not corroded, thereby protecting the bar body from corrosion; the stabilizer bar has strong corrosion resistance. The inner walls of comparative examples 1 to 3 were all corroded, and the rod body of the stabilizer bar was corroded; while comparative examples 4 to 5 also provided the silicon aluminum surface layer 210, the diffusion layer 220 and the electrophoretic layer, the inner wall thereof was rusted, and the corrosion resistance was poor, indicating that the corrosion resistance was general beyond the content ranges of the components corresponding to the surface layer 210 and the diffusion layer 220 of the present application.

Although comparative examples 1, 4-5 had fatigue life values of 21, 25 and 23 ten thousand times, respectively, which were greater than those of comparative examples 2 to 3, the inner wall of the stabilizer bar was also rusted, that is, the comparative examples were not provided with the anticorrosive layer of the present application, did not pass the 480 hour neutral salt spray test, and had weak corrosion resistance, failing to meet the requirements.

The stabilizer bar of this application adopts the body of rod of specific element content to set up high temperature resistant and anticorrosive excellent anticorrosive coating of anticorrosive performance at the surface of body of rod, utilize waste heat quenching and low temperature tempering after the thermoforming to handle, the inner wall of body of rod, outer wall all do not have decarbonization oxidation, cancel the peening process, the inner wall of body of rod need not to carry out anticorrosive treatment, the body of rod has very high intensity and impact resistance, in addition the high hardness of surface anticorrosive coating, make the fatigue life of stabilizer bar obtain showing and improve. Meanwhile, the production time is shortened, the energy is saved and the carbon emission is reduced by reducing the working procedures.

The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (9)

1. A stabilizer bar, comprising:

a rod body; and

the anti-corrosion layer is arranged on the surface of the rod body, the anti-corrosion layer comprises a surface layer, and the surface layer comprises the following components in percentage by mass: 6-10% of Si and 90-94% of Al;

the anti-corrosion layer further comprises a diffusion layer, and the diffusion layer is positioned between the surface layer and the rod body; the diffusion layer comprises the following components in percentage by mass: 72-78% of Al,9-13% of Si and 11-16% of Fe.

2. The stabilizer bar of claim 1, wherein said corrosion-resistant layer has a thickness of 20-30 μm.

3. A stabilizer bar according to any one of claims 1 to 2, wherein the bar body is hollow and the anti-corrosion layer is provided on the inner and/or outer surface of the bar body; and/or the number of the groups of groups,

the stabilizer bar further comprises an electrophoresis layer, and the electrophoresis layer is located on one surface, far away from the bar body, of the anti-corrosion layer.

4. A stabilizer bar according to claim 3, wherein the corrosion protection layer is provided on the surface of the bar body by hot dip plating.

5. The stabilizer bar of claim 4, wherein the bar body comprises the following components in mass percent:

C：0.33-0.37％；

Si：0.15-0.30％；

Mn：1.20-1.40％；

Cr：0.020％-0.040％；

B：0.003-0.006％。

6. a method of preparing a stabilizer bar according to any one of claims 1 to 5, comprising the steps of:

arranging an anti-corrosion coating on the surface of the rod body;

preserving heat for a preset time for the rod body after the anti-corrosion coating is prepared, so that the anti-corrosion coating is alloyed with the rod body; wherein the heat preservation temperature is 930+/-15 ℃, and the preset time is more than or equal to 15min;

putting the alloyed rod body into quenching liquid, cooling to below 200 ℃, and tempering to obtain a surface layer on the rod body, wherein the surface layer comprises an anticorrosive layer with 6-10% of Si and 90-94% of Al; wherein the tempering heat preservation temperature is 320+/-10 ℃, and the heat preservation time is more than or equal to 60 minutes.

7. The stabilizer bar of claim 6, wherein said preparing an anti-corrosion coating on the surface of the bar body comprises the steps of:

s1, immersing a rod body into a container containing plating solution for hot dip plating; wherein, the plating solution comprises the following components: 8-15% of Si, 70-80% of Al and the balance of Fe; the process temperature of the hot dip plating is controlled at 620+/-10 ℃;

s2, cooling to room temperature after hot dip plating so as to prepare the anti-corrosion coating on the surface of the rod body.

8. A suspension assembly comprising a stabilizer bar according to any one of claims 1 to 5.

9. A vehicle comprising a body and the suspension assembly of claim 8, the suspension assembly being mounted to the body.