JPH051395A - Electrolytic plating method and device therefor - Google Patents

Abstract

PURPOSE:To attain a plating of an unbendable material such as a thick steel sheet by enabling an electrode to travel and by jetting a plating solution between the electrode and a material to be plated. CONSTITUTION:The electrode unit 1 provides the electrode plate 11 to face against the upper plating surface of the steel plate 2 and plates the plate 2 while travelling horizontally. The plating solution heated by the heating device 10 is jetted between the steel plate and the electrode plate 11 via the pressure pump 7 and the pipe line 8. Without increasing temp. of the thick steel sheet having large heat capacity, the plating high in efficiency and quality is obtained with heating of only the surface of the steel sheet 2 by the plating solution heated just before plating.

Description

Detailed Description of the Invention

[0001]

The present invention relates to thick steel plates, medium steel plates, etc.
The present invention relates to an electrolytic plating method and apparatus for plating a material such as a cold rolled steel sheet that cannot be electrolytically plated while bending a material to be plated.

[0002]

2. Description of the Related Art Conventionally, as a plating method for a material that cannot be plated while bending a material to be plated such as a thick steel plate and a medium steel plate, there is a method of immersing in a large plating tank, as represented by hot dip galvanizing. Japanese Patent Laid-Open No. 2-18289
As disclosed in Japanese Patent Laid-Open No. 3 (1993), there is only a method using an electrode pad which is impregnated with a paste plating solution without using a plating bath. Therefore, plating is unavoidable after cutting and welding. Further, the paste plating has a problem that the plating efficiency is inferior to the liquid plating and it is difficult to make the current density uniform.

Recently, as a dry plating method, there is a plating method in which zinc or the like is attached to the periphery of the abrasive cleaning material, and blasting is used.

[0004]

As is well known in the field of plating of cold-rolled steel sheets, the steel sheets can be freely bent and passed through a plating solution while at the same time being energized. However, this method cannot be applied to thick steel plates, medium steel plates, and the like because it is impossible to bend the steel plates. At present, there is no choice but to rely on a low-efficiency plating method at a low current density by immersing it in a large-scale plating tank.

The present invention provides an electrolytic plating method and apparatus capable of treating these thick steel plates, medium steel plates and the like without bending to obtain high efficiency and high quality plating.

[0006]

The present invention makes it possible to plate a material such as a thick steel plate and a medium steel plate that cannot be plated by bending a material to be plated.

That is, according to the first aspect of the present invention, in order to achieve the above object, the inflexible material to be plated is horizontally immersed in the plating solution in the plating bath to form an electrode on the upper surface of the material to be plated. Is a method of electrolytic plating in which the plating solution is circulated by facing each other while the plating solution is circulated between the material to be plated and the electrode while the plating solution is being circulated. There is provided an electrolytic plating method characterized in that a liquid surface is held above the electrode surface and the electrode is horizontally moved for plating.

Further, according to the second aspect of the present invention, there is provided an electrolytic plating apparatus having a plating tank, a preliminary tank and an electrode unit, for circulating a plating solution to plate an inflexible material to be plated. There, the plating tank is capable of horizontally loading the material to be plated, and the preliminary tank is provided in communication with the plating tank and heats the plating solution flowing from the plating tank,
The electrode unit has a heater and an agitator for stirring, the electrode unit has an electrode plate facing the upper surface of the material to be plated, and a heating device for heating the plating solution and the heated plating solution are the material to be plated. And a means for ejecting between the electrode plate and the electrode plate so as to be horizontally movable, and having a circulation system for circulating a plating solution between the plating tank, the auxiliary tank and the electrode unit. An electrolytic plating apparatus is provided.

The present invention will be described in more detail below.

First, a first aspect of the present invention will be described with reference to FIGS. 1 and 2. In the following description, a thick steel plate (hereinafter, simply referred to as a steel plate) is taken as a representative example of the material to be plated, but the material to be plated is not limited to this. A plate having a thickness of about 6 mm or more is symmetrical.

FIG. 1 shows an example of an electrolytic plating apparatus to which the method of the present invention is applied. This apparatus has a plating tank 3, a preliminary tank 4, and an electrode unit 1. Plating tank 3
May have a size such that the material to be plated (steel plate 2) can be loaded horizontally and a material that is difficult to bend, such as a thick steel plate and a medium steel plate, can be loaded.

The preliminary tank 4 has a heater 5 and a stirrer 6, and is provided in communication with the plating tank 3. The plating solution cooled in the plating tank 3 is transferred from the plating tank 3 to the preliminary tank 4
It is possible to heat and stir the plating solution that has flowed out to the preliminary tank 4 to a temperature close to the plating temperature to make it uniform.

The electrode unit 1 has an electrode plate 11 facing the plated surface, that is, the upper surface of the steel plate 2 (see FIG. 2),
Plating is performed while the electrode unit 1 horizontally moves on the steel plate 2. A heating device 10 is provided in this unit, and the plating solution previously heated to a temperature close to the plating temperature in the preliminary tank 4 is transferred by the pressure pump 7 and the pipe 8 and heated to a predetermined plating temperature. The heating device 10 is not particularly limited. The plating solution heated to a predetermined temperature is jetted between the steel plate 2 and the electrode plate 11 when the electrode unit 1 is horizontally moved and plated. The ejection method is not limited.

A circulation system for circulating a plating solution is provided between the plating tank 3, the preliminary tank 4 and the electrode unit 1. The plating solution is pressurized by, for example, the pump 7 to give a flow rate to form a circulation system to eliminate the gas generated during plating, and at the same time, heat it to a high current density to achieve high efficiency plating. I am trying. The plating liquid surface 9 during plating may be above the lower surface of the electrode plate 11 on the steel plate 2 as shown in FIG. The sealing material 14 need not be a perfect seal.

With cold-rolled steel sheets, the heat of the plating solution causes the steel sheet to immediately rise to a temperature near the plating solution. However, for thick steel plates and the like, it takes time for the temperature of the steel plate 2 to rise close to the temperature of the plating solution. Further, in the present invention, since the surface area of the plating solution is large, the plating solution is relatively easy to cool. Therefore, there is an advantage in heating the plating solution immediately before plating. That is, even if the temperature of the steel sheet 2 is not raised, high efficiency and high quality plating can be obtained by heating only the surface of the steel sheet 2 with the plating solution.

As a heating method, gas, electricity, steam or the like can be used, but the efficiency of heating with combustion gas or steam is desirable.

Further, as compared with the conventional immersion type plating method, by heating the plating solution immediately before plating, it is possible to perform high quality and quick plating with a very large current density. Further, since the material to be plated is immersed in the plating solution, there is no discoloration of the plated surface and a good plated surface can be obtained.

Here, an operation example of the present invention will be described.

First, the steel plate 2 is installed horizontally in the plating tank 3. The plating tank 3 has a distance (depth) larger than the distance between contacts.
Of the plating solution (the liquid surface 9 is above the lower surface of the electrode unit 1 as shown in FIG. 2).

Next, the electrode unit 1 is moved to the left (or right) end portion on the steel plate 2, and the pump 7 pumps up and pressurizes the plating solution in the auxiliary tank 4 to supply it to the electrode unit 1 to supply the plating solution. Circulate. The plating solution is preheated in the preliminary tank 4.

When the electrode unit 1 is filled with the plating solution, the electrode unit 1 is moved to the right (or left) and simultaneously energized (not shown). Plating is now possible.

The desired plating thickness can be controlled by the traveling speed of the electrode unit 1 and the current density. The running method of the electrode unit 1 is as follows.
It is desirable to mount it on the vehicle and run it (see Fig. 2).

The plating solution ejected from the electrode unit 1 is
It flows from the plating tank 3 into the preliminary tank 4. In the spare tank 4, the plating solution such as the pH of the plating solution is managed, and if necessary, equipment for adding the plating solution raw material, removing impurities, and the like can be added.

Next, a second aspect of the present invention will be described with reference to FIGS. Since the plating tank 3 and the like have already been described, description thereof will be omitted.

FIG. 2 is an example of a cross-sectional view of the electrode unit 1 which is the most important for performing electrolytic plating. Spare tank 4
The plating solution preheated at
Is supplied to the electrode unit 1. The heater 10 provided in the electrode unit 1 causes the plating solution to flow in the direction of the electrode plate 11 while being further heated, and passes between the steel plate 2 and the electrode plate 11. Steel plate 2 and electrode plate 1
It is desirable to provide the wing 12 so that the plating solution fills the space between the first and second parts and the bubbles are less likely to be generated.

As a pretreatment for plating, conventionally, degreasing,
Although complicated steps such as pickling and neutralization are carried out, shot blasting is sufficient as the pretreatment in the present invention.

According to the present invention, higher quality plating can be performed quickly with a small-scale apparatus, as compared with the conventional plating on thick steel plates.

[0028]

EXAMPLES The present invention will be specifically described below based on examples.

(Example 1) Ni plating was performed by the apparatus shown in FIGS. 1 and 2. The composition of the plating solution was a sulfamic acid bath, and the plating conditions were as follows. Composition Nickel sulfamate 300g / l Nickel chloride 30g / l Boric acid 30g / l Plating solution temperature Preliminary bath temperature 40 ℃, Plating temperature 50
〜55 ℃ Current density 50A / dm ² Plating solution flow rate 0.5〜0.8m / sec

The electrodes have a width of 500 mm and a depth of 200 mm.
Ni plate was used and the distance between the electrodes was 10 mm. The steel plate is
Regular steel SM50B, thickness 15 mm, 500 mm x 10
A shot blast material of 00 mm was used. Both ends of the steel plate were plated by temporarily stopping the electrode unit. Ni of about 2 μm thickness at plating speed (electrode unit speed) of 1 m / min
A plating was obtained. The plated surface was good, and the plating efficiency in this case was 90% or more.

[0031]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, various kinds of electroplating can be performed on a thick steel plate or the like on which the material to be plated cannot be bent. It has the effect of expanding applications.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an example of an electrolytic plating apparatus of the present invention.

FIG. 2 is a partial cross-sectional view of the electrode unit of FIG.

[Explanation of symbols]

1 electrode unit 2 Plated material (steel plate) 3 plating tank 4 Plating spare tank 5 heater 6 stirrer 7 Pressurizing pump 8 piping 9 Plating surface 10 Plating solution heating device 11 electrode plate 12 wings 13 electrode unit frame 14 Seal material

Claims (2)

[Claims] 1. An electrolytic plating method in which a non-flexible material to be plated is horizontally immersed in a plating solution in a plating tank, and an electrode is opposed to the upper surface of the material to be plated and electrolytic plating is performed while circulating the plating solution. To spray the heated plating solution during circulation between the material to be plated and the electrode, hold the plating solution surface in the plating tank above the electrode surface, and move the electrode horizontally. An electrolytic plating method, characterized by performing the plating. 2. An electrolytic plating apparatus configured to have a plating tank, a preliminary tank, and an electrode unit and to circulate a plating solution to plate an inflexible material to be plated, wherein the plating tank is made of a material to be plated. It can be loaded horizontally, and the preliminary tank has a heater and a stirrer that are provided in communication with the plating tank to heat and stir the plating solution flowing from the inside of the plating tank. Horizontally movable with an electrode plate facing the top surface of the plating material, a heating device for heating the plating solution, and means for ejecting the heated plating solution between the material to be plated and the electrode plate. And an electroplating apparatus having a circulation system for circulating a plating solution between the plating tank, the auxiliary tank, and the electrode unit.