Solution in use for plating trivalent chromium, and plating method for using the plating solution

A technology of trivalent chromium and plating solution, which is applied in the field of plating solution for trivalent chromium electroplating and electroplating using the plating solution, and can solve problems such as low covering ability and monotonous coating color

Inactive Publication Date: 2007-12-26
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is in order to overcome the shortcoming that the covering power of existing plating solution for trivalent chromium electroplating is low, and the coating color that obtains is monotonous, provides a kind of coating that has strong covering power and the coating color that obtains is rich in trivalent chromium electroplating. electroplating bath

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] The preparation method of the plating solution provided by the present invention is the same as the preparation method of the conventional plating solution for trivalent chromium electroplating. According to the above content, each component is added into water and stirred evenly, and then the pH value can be adjusted. The plating solution of the present invention can also be prepared by adding ferric chloride and optionally manganese chloride into an existing commercially available plating solution, and then using alkaline substances to adjust the pH.

[0018] The trivalent chromium electroplating method provided by the invention comprises putting the workpiece into the plating solution as the cathode, putting the graphite plate into the plating solution as the anode, and then switching on the DC power supply, and the plating solution contains a potting agent, a stabilizer, and a wetting agent And complexing agent, wherein, the plating solution also contains ferric chlo...

Embodiment 1-5

[0025] These examples are used to illustrate the plating solution for trivalent chromium electroplating provided by the present invention.

[0026] Ferric chloride and the manganese chloride selectively contained are joined in the TVC trivalent chromium plating solution (wherein, this TVC trivalent chromium plating solution contains 425 grams per liter) according to the content shown in table 1 TVC-BC cylinder opening agent, TVC-CAT stabilizer of 65 milliliters / liter, TVC-MS wetting agent of 3 milliliters / liter and TVC-EXT complexing agent of 1 milliliter / liter), after stirring evenly, add ammoniacal liquor The pH values ​​of the plating solutions were respectively adjusted to the pH ranges of the plating solutions shown in Table 1 to obtain the plating solutions D1-D5.

Embodiment 6

[0035] This embodiment is used to illustrate the trivalent chromium electroplating method provided by the present invention.

[0036]Put the workpiece coated with bright nickel on the surface into the plating solution prepared in Example 5 as the cathode, and use the high-purity graphite plate as the anode, connect the DC power supply, at a temperature of 32 ° C, the cathode current density is 20 ampere / square minute M conditions for 1 min.

[0037] The workpiece after electroplating was dipped in 30 g / L chromic anhydride aqueous solution at 30° C. for 20 seconds. Then the workpiece surface was cleaned with water and dried at 80°C.

[0038] Gained coating is uniform in color, and the adhesion of the coating is good (shedding rate is less than 10%) measured by the cross-knife test described below, and the appearance of the coating after the neutral salt spray test described below is normal.

[0039] Hundred grid knife test: place the sample on the test table, use a cutting kn...

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Abstract

This invention provides a plating solution for trivalent chrome electroplating. The plating solution comprises make-up agent, stabilizer, wetting agent, complexing agent and FeCl3. This invention also provides a method for trivalent chrome electroplating by using the plating solution. The coordination effect of FeCl3 with the other components can improve the covering performance of the plating solution, and can adjust the darkness of the plating layer so that the colors of the product are abundant.

Description

technical field [0001] The present invention relates to a plating solution for electroplating and an electroplating method using the same, more particularly, the present invention relates to a plating solution for trivalent chromium electroplating and an electroplating method using the same. Background technique [0002] The toxicity of trivalent chromium is only 1% of that of hexavalent chromium, the sewage treatment is easy, and the adhesion and corrosion resistance of the trivalent chromium plating layer are very good. Therefore, the trivalent chromium plating process has been developed rapidly in recent years. [0003] Existing plating solutions for trivalent chromium electroplating generally include potting agents, stabilizers, wetting agents and complexing agents, and the pH value is 2.5-3.0. Commercially available plating solutions for trivalent chromium electroplating mainly include Shangma TVC Trivalent Chromium of Technology Co., Ltd., TC Trivalent Chromium of Inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/06
Inventor 彭波李爱华
Owner BYD CO LTD
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