CN106591761A - Preparation method for composite coating resisting etching of molten metal - Google Patents
Preparation method for composite coating resisting etching of molten metal Download PDFInfo
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- CN106591761A CN106591761A CN201510658604.XA CN201510658604A CN106591761A CN 106591761 A CN106591761 A CN 106591761A CN 201510658604 A CN201510658604 A CN 201510658604A CN 106591761 A CN106591761 A CN 106591761A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
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Abstract
The invention discloses a preparation method for a composite coating resisting etching of molten metal. The method includes the steps that the surface of a workpiece base body is pretreated; and then a plasma spraying mode is adopted to spray metal Mo powder to the surface of the workpiece base body to form a bottom coating, to spray CoMoCr alloy powder to form an intermediate bonding protection layer, and to spray potassium titanate whisker powder to form a working coating in sequence. The composite coating prepared through the method is compact in structure and good in bonding and has high corrosion resistance and abrasion resistance, galvanizing zinc has the low wetting feature on the coating, and thus the phenomenon that aluminum and zinc adhere to the surfaces of workpieces is reduced; and the service life of the workpieces is effectively prolonged, and the production quality of hot-dipped boards is improved.
Description
Technical field
The present invention relates to material hot-spraying coating preparing technical field, more particularly to a kind of preparation method of molten-metal-resistant etch composite coating.
Background technology
Hot dip plate has good corrosion resisting property and good formability, weldability and coating, and hot dip plate is just more and more broadly substituting at present other cold rolling clad plates and applying in the industries such as automobile, building and household electrical appliances.Sinking roller is the key equipment of hot dip unit production, its technical performance is the principal element for affecting hot dip product appearance quality and yield, it is to be immersed in when being worked due to sinking roller in molten metal, working environment is extremely severe, in addition to the erosion by high temperature fluent metal Zn, Al, abrasion and the pulling force effect of with steel are also subject to, generally, iron can react with plating solution and generate Fe2Al5Equipment surface is attached to Deng intermetallic compound or in the form of cadmia in plating solution, these reaction products are after the attachment of sinking roller roll surface, when with steel in zinc pot through sinking roller when, the cadmia of roll surface accumulation can be pressed into strip coating and be transferred to with steel surfaces, so that belt steel surface forms defect or cut, the presentation quality of hot dip panel products is greatly affected.
Sinking roller and stabilizing roller surface spraying WC-Co coatings generally in hot dip unit, the coating is usually no more than two weeks due to there is certain viscous zinc phenomenon, generally contiguous service life, needs to carry out surface to move back zinc and roller surface reparation grinding, so that it reaches machine working condition again.Simultaneously as the needs of development of modern industry, various novel high aluminum content coating are continued to bring out, and more than 500 DEG C, WC-Co coatings cannot meet new use requirement to the operating temperature of fused solution.And the coating prepared using the preferable ceramic material of the resistance to erosion energy of borides there is fragility and thermal coefficient of expansion differs greatly with stainless steel base, it is easily caused sinking roller and peels off in the big use process floating coat of temperature change.Therefore, requirements at the higher level are proposed to the face coat performance of the workpiece such as sinking roller and stabilizing roller.
The content of the invention
The technical problem to be solved is to provide a kind of preparation method of molten-metal-resistant etch composite coating, composite coating structure prepared by this method is fine and close, be well combined, with higher resistance to corrode and abrasion resistance properties, and there is relatively low imbibition characteristic with zinc liquid, reduce surface of the work viscous aluminium, zinc phenomenon, the service life of workpiece is effectively improved, the quality of production of hot dip plate is improve.
To solve above-mentioned technical problem, the preparation method of molten-metal-resistant etch composite coating of the present invention comprises the steps:
Step one, workpiece substrate surface is carried out oil removing, dehumidifying and sandblast texturing pretreatment;
Step 2, using plasma spraying mode in workpiece substrate surface spraying metal Mo powder, form prime coat;
Step 3, using plasma spraying mode in prime coat surface spraying CoMoCr alloy powders, formed in the middle of combinative prevention layer;
Step 4, using plasma spraying mode middle combinative prevention layer surface spray potassium titanate crystal whisker powder, formed work coating.
Further, sprayed between middle combinative prevention layer and work coating using plasma spraying mode and mixed the transition zone for constituting by CoMoCr alloy powders and potassium titanate crystal whisker powder.
Further, potassium titanate crystal whisker content is 25~55wt% in the transition zone.
Further, the thickness of the transition zone is 0.02~0.04 mm.
Further, the thickness of the prime coat is 0.03~0.05 mm, and the thickness of the middle combinative prevention layer is 0.02~0.04 mm, and the thickness of the work coating is 0.06~0.09 mm.
Further, the particle size range of the metal Mo powder is 15~75 μm, and the particle size range of the CoMoCr alloy powders is 10~53 μm, 20~125 μm of the particle size range of the potassium titanate crystal whisker powder.
Further, the composition by weight percent of the CoMoCr alloy powders is 26~30%Mo, 6.0~19%Cr, balance of Co and impurity.
Because the preparation method of molten-metal-resistant etch composite coating of the present invention employs above-mentioned technical proposal, i.e. this method workpiece substrate surface is pre-processed first;Then prime coat, spraying CoMoCr alloy powders are formed in workpiece substrate surface spraying metal Mo powder using plasma spraying mode successively and forms middle combinative prevention layer, spraying potassium titanate crystal whisker powder formation work coating.Composite coating structure prepared by this method is fine and close, be well combined, with higher resistance to corrode and abrasion resistance properties, and there is relatively low imbibition characteristic with zinc liquid, reduce surface of the work viscous aluminium, zinc phenomenon, the service life of workpiece is effectively improved, the quality of production of hot dip plate is improve.
Specific embodiment
The preparation method of molten-metal-resistant etch composite coating of the present invention comprises the steps:
Step one, workpiece substrate surface is carried out oil removing, dehumidifying and sandblast texturing pretreatment;
Step 2, using plasma spraying mode in workpiece substrate surface spraying metal Mo powder, form prime coat;
Step 3, using plasma spraying mode in prime coat surface spraying CoMoCr alloy powders, formed in the middle of combinative prevention layer;
Step 4, using plasma spraying mode middle combinative prevention layer surface spray potassium titanate crystal whisker powder, formed work coating.
Preferably, sprayed between middle combinative prevention layer and work coating using plasma spraying mode and mixed the transition zone for constituting by CoMoCr alloy powders and potassium titanate crystal whisker powder.
Preferably, in the transition zone potassium titanate crystal whisker content be 25~
55wt%。
Preferably, the thickness of the transition zone is 0.02~0.04 mm.
Preferably, the thickness of the prime coat is 0.03~0.05 mm, and the thickness of the middle combinative prevention layer is 0.02~0.04 mm, and the thickness of the work coating is 0.06~0.09 mm.
Preferably, the particle size range of the metal Mo powder is 15~75 μm, and the particle size range of the CoMoCr alloy powders is 10~53 μm, 20~125 μm of the particle size range of the potassium titanate crystal whisker powder.
Preferably, the composition by weight percent of the CoMoCr alloy powders is 26~30%Mo, 6.0~19%Cr, balance of Co and impurity.
Generally sinking roller and stabilizing roller are made up of stainless steel materials such as 316L in hot dip unit, this method first sprays one layer of metal Mo powder with self-bonding performance to improve the bond strength of coating and matrix on the surface of the work after purified and roughening treatment, not only there is mechanical bond between coating with self-bonding performance and matrix and micro metallurgic bonding also occurs, its general principle is that Mo materials molten drop in spraying carries substantial amounts of heat energy, there is oxidation reaction and discharge out substantial amounts of heat again to make the temperature of molten drop further raise in the oxygen in overheated molten drop and air, there is metallurgical binding when colliding in molten drop and matrix, form self-bonding layer.Self-bonding layer is present between matrix and work coating, and good combination had not only improve with the adhesion of matrix but also provided a coarse surface gives work coating.Meanwhile, Mo coatings have good resistance to liquid metal corrosion performance, and with lyophobicity.
CoMoCr alloys have good compatibility and binding ability with Mo metals, cobalt is good Binder Phase, the addition of chromium can strengthen Binder Phase, improve the antioxygenic property of coating, simultaneously, the intermetallic compound of Laves phases can be formed in CoMoCr coatings, with hardness is high, resistance to liquid metal corrosion, wear-resistant, resistance to high temperature oxidation are up to 800 DEG C, the middle combinative prevention layer can also effectively prevent the roller coating infiltration oxidative damage of 400 DEG C of high temperature above air to Mo bottoms in using front warm that sinks, it is ensured that the good combination of composite coating and matrix.
The potassium titanate molecular formula of work coating is K2O
NTiO2, is exactly potassium hexatitanate as n=6, and crystal structure is tunnel type, and potassium ion is coated in the middle of tunnel, and the atom of isolation perimeter, so as to have very high chemical stability, mechanical strength is higher.The whisker of formation is a kind of new needle-like chopped fiber, is a kind of high-performance composite materials reinforcing agent, with good mechanical property and physical property, also with very high heat resistance(1200℃)With good resistance to corrode and wear resistance, and with liquid zn Al not mutually affine wettings, possess anti-stick property.Meanwhile, the microstructure that coating is formed is presented filamentary structure, is conducive to improving coating toughness and thermal shock resistance.
Plasma spraying mode is that the high temperature plasma jet by being produced using non-diverting type electric arc is heated to sprayed on material and accelerated, and makes sprayed on material reach a high temperature fast state, is ejected in substrate deposit at a high speed from gun barrel and forms coating.Because plasma jet has, energy density is high, temperature is high, fast feature, and sprayed on material scope is wide, can deposit all materials with physics fusing point.Plasma spraying coating tissue is more fine and closely woven, and oxide content and porosity are relatively low, and the bond strength between combination and coating particle between coating and matrix is higher.
Embodiment 1:
Oil removing, dehumidifying and sandblast texturing pretreatment are carried out to roll body substrate surface to be painted, using plasma spraying mode first on matrix spray metal Mo powder, form the thick prime coats of 0.05 mm;Equally using plasma spraying mode in prime coat surface spraying CoMoCr alloy powders, the thick middle combinative prevention layers of 0.02mm are formed;One layer is sprayed on middle combinative prevention layer the transition zone that thickness is 0.04 mm is constituted by CoMoCr and potassium titanate crystal whisker mixing, the % of potassium titanate crystal whisker content 35 in the transition zone;Using same spraying method in middle combinative prevention layer and excessive layer surface spraying potassium titanate crystal whisker powder, the surface work coating of 0.08mm is formed.
Embodiment 2:
Oil removing, dehumidifying and sandblast texturing pretreatment are carried out to roll body substrate surface to be painted, using plasma spraying mode first on matrix spray metal Mo powder, form the thick prime coats of 0.03 mm;Equally using plasma spraying mode in prime coat surface spraying CoMoCr alloy powders, the thick middle combinative prevention layers of 0.03mm are formed;Potassium titanate crystal whisker powder is sprayed in middle combinative prevention layer surface using same spraying method, the surface work coating of 0.09mm is formed.
Embodiment 3:
Oil removing is carried out to roll body substrate surface to be painted, is dehumidified and sandblast texturing pretreatment, CoMoCr alloy powders are sprayed first on matrix using plasma spraying mode, form the thick bottoming of 0.04mm and middle combinative prevention layer;One layer is sprayed on middle combinative prevention layer the transition zone that thickness is 0.03 mm is constituted by CoMoCr and potassium titanate crystal whisker mixing, the % of potassium titanate crystal whisker content 25 in the transition zone;Using same spraying method in transition zone surface spraying potassium titanate crystal whisker powder, the surface work coating of 0.07mm is formed.
The characteristics of this method:
There is self-bonding performance between 1.Mo coatings and stainless steel base, a coarse surface had not only been improve with the adhesion of matrix but also provided to binder course, meanwhile, Mo coatings have good resistance to liquid metal corrosion performance, and with lyophobicity;
2.CoMoCr alloys have good compatibility and binding ability with Mo metals, and the intermetallic compound excellent performance of the Laves phases in coating, this layer can also effectively prevent the high-temperature oxydation of prime coat Mo, while the layer also can be used directly as prime coat;
3. the introducing of potassium titanate crystal whisker ceramic material, improves the corrosion-resistant and abrasion resistance properties of coating, meanwhile, the bacillar structure structure of coating is conducive to improving the toughness of ceramic phase and thermal shock resistance;
4. wide using plasma spraying material ranges, coating structure is more fine and closely woven, and oxide content and porosity are relatively low, so as to the overall performance and coating that ensure composite coating prepare it is simple and easy to do.
Molten-metal-resistant etch composite coating intensity height prepared by this method, good toughness, there are very strong high temperature resistant and thermal shock resistance, there is excellent wear-resistant, the liquid zinc corrosion of resistance to molten aluminum ability simultaneously, by the compound transition of cermet, coating and stainless steel base coefficient of thermal expansion are relatively close to, coating is difficult to peel off, and compared with conventional coatings, performance is greatly enhanced.
Claims (7)
1. a kind of preparation method of molten-metal-resistant etch composite coating, it is characterised in that this method comprises the steps:
Step one, workpiece substrate surface is carried out oil removing, dehumidifying and sandblast texturing pretreatment;
Step 2, using plasma spraying mode in workpiece substrate surface spraying metal Mo powder, form prime coat;
Step 3, using plasma spraying mode in prime coat surface spraying CoMoCr alloy powders, formed in the middle of combinative prevention layer;
Step 4, using plasma spraying mode middle combinative prevention layer surface spray potassium titanate crystal whisker powder, formed work coating.
2. the preparation method of molten-metal-resistant etch composite coating according to claim 1, it is characterised in that:Sprayed between middle combinative prevention layer and work coating using plasma spraying mode and mixed the transition zone for constituting by CoMoCr alloy powders and potassium titanate crystal whisker powder.
3. the preparation method of molten-metal-resistant etch composite coating according to claim 2, it is characterised in that:Potassium titanate crystal whisker content is 25~55wt% in the transition zone.
4. the preparation method of the molten-metal-resistant etch composite coating according to Claims 2 or 3, it is characterised in that:The thickness of the transition zone is 0.02~0.04 mm.
5. the preparation method of molten-metal-resistant etch composite coating according to claim 1, it is characterised in that:The thickness of the prime coat is 0.03~0.05 mm, and the thickness of the middle combinative prevention layer is 0.02~0.04 mm, and the thickness of the work coating is 0.06~0.09 mm.
6. the preparation method of molten-metal-resistant etch composite coating according to claim 1, it is characterised in that:The particle size range of the metal Mo powder is 15~75 μm, the particle size range of the CoMoCr alloy powders is 10~
53 μm, 20~125 μm of the particle size range of the potassium titanate crystal whisker powder.
7. the preparation method of molten-metal-resistant etch composite coating according to claim 1 and 2, it is characterised in that:The composition by weight percent of the CoMoCr alloy powders is 26~30%Mo, 6.0~19%Cr, balance of Co and impurity.
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Cited By (4)
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CN107904536A (en) * | 2017-11-14 | 2018-04-13 | 北京矿冶研究总院 | Sealant-free molten zinc-aluminum corrosion resistant coating material and preparation method thereof |
CN111424229A (en) * | 2018-12-20 | 2020-07-17 | 上海宝钢工业技术服务有限公司 | Preparation method of composite coating resistant to liquid metal alloy erosion |
CN112575210A (en) * | 2020-11-27 | 2021-03-30 | 李江巡 | Preparation process of high-strength corrosion-resistant aluminum alloy |
CN114686796A (en) * | 2020-12-31 | 2022-07-01 | 安泰天龙钨钼科技有限公司 | Wear-resistant corrosion-resistant coating material, coating and preparation method thereof |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN107904536A (en) * | 2017-11-14 | 2018-04-13 | 北京矿冶研究总院 | Sealant-free molten zinc-aluminum corrosion resistant coating material and preparation method thereof |
CN107904536B (en) * | 2017-11-14 | 2020-01-07 | 北京矿冶研究总院 | Sealant-free molten zinc-aluminum corrosion resistant coating material and preparation method thereof |
CN111424229A (en) * | 2018-12-20 | 2020-07-17 | 上海宝钢工业技术服务有限公司 | Preparation method of composite coating resistant to liquid metal alloy erosion |
CN111424229B (en) * | 2018-12-20 | 2022-12-27 | 上海宝钢工业技术服务有限公司 | Preparation method of composite coating resistant to liquid metal alloy etching |
CN112575210A (en) * | 2020-11-27 | 2021-03-30 | 李江巡 | Preparation process of high-strength corrosion-resistant aluminum alloy |
CN114686796A (en) * | 2020-12-31 | 2022-07-01 | 安泰天龙钨钼科技有限公司 | Wear-resistant corrosion-resistant coating material, coating and preparation method thereof |
CN114686796B (en) * | 2020-12-31 | 2024-02-13 | 安泰天龙钨钼科技有限公司 | Wear-resistant corrosion-resistant coating material, coating and preparation method thereof |
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Address after: 3520 Tongji Road, Baoshan District, Shanghai 201900 Patentee after: Baowu equipment Intelligent Technology Co.,Ltd. Address before: 201900, 335, Pu Pu Road, Shanghai, Baoshan District Patentee before: SHANGHAI BAOSTEEL INDUSTRY TECHNOLOGICAL SERVICE Co.,Ltd. |