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Whole sulphate type trivalent chromium plating solution and electroplating method using the same

A sulfate type, electroplating solution technology, applied in the field of trivalent chromium electroplating solution, can solve the problems of small current density range in bright area, small current density range of coating layer, etc. good effect

Active Publication Date: 2008-10-08
BYD CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the existing full sulfate type trivalent chromium electroplating solution, such as the small current density range of the plating layer and the small current density range in the bright area, and provide a full range of current density in the plating layer and a large current density range in the bright area. Sulfate type trivalent chromium electroplating solution

Method used

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Examples

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preparation example Construction

[0020] The preparation method of the electroplating solution provided by the present invention is basically the same as the preparation method of the conventional electroplating solution for trivalent chromium electroplating, and each component is stirred evenly according to the above content, and then the pH value can be adjusted.

[0021] The electroplating method provided by the present invention includes putting the workpiece into the electroplating solution as the cathode, putting titanium-based iridium dioxide into the electroplating solution as the anode, and then performing electroplating under electroplating conditions, wherein the electroplating solution is the electroplating solution provided by the present invention. liquid.

[0022] According to the trivalent chromium electroplating method provided by the present invention, except that the electroplating solution of the present invention is used, the electroplating steps and conditions are the same as the conventio...

Embodiment 1

[0025] This embodiment is used to illustrate the full sulfate type trivalent chromium electroplating solution provided by the present invention and its preparation method.

[0026] Add 600ml of distilled water to the beaker and heat it to 60°C; then add 115g of potassium sulfate, 35g of sodium sulfate, 70g of boric acid, 10g of potassium formate and 10g of potassium acetate; stir until completely dissolved The pH value of the solution is adjusted to 1.8 with concentrated sulfuric acid; Add 15 grams of chromium sulfate, add water to 900 milliliters, slowly adjust the pH value to 3.4 with NaOH with a concentration of 20% by weight, and keep the solution at 47° C. for 12 hours, Add 0.05 g of OP-10 (Shanghai Rufa Chemical Technology Co., Ltd.) and 0.05 g of o-benzoylsulfonimide (Guangzhou Yijunming Chemical Co., Ltd.) to the solution, and add distilled water to a final volume of 1 liter to obtain the electroplated Liquid D1.

Embodiment 2

[0028] This embodiment is used to illustrate the full sulfate type trivalent chromium electroplating solution provided by the present invention and its preparation method.

[0029] Add 600ml of distilled water to the beaker and heat it to 60°C; then add 115g of potassium sulfate, 35g of sodium sulfate, 70g of boric acid, 10g of potassium formate and 10g of potassium acetate; stir until completely dissolved The pH value of the solution is adjusted to 1.8 with concentrated sulfuric acid; Add 15 grams of chromium sulfate, add water to 900 milliliters, slowly adjust the pH value to 3.4 with 20% by weight of NaOH, and keep the solution at 47°C for 12 hours, and add to the solution Add 0.05 g of OP-10 (Shanghai Rufa Chemical Technology Co., Ltd.), 0.05 g of cystine and 0.05 g of o-benzoylsulfonimide (Guangzhou Yijunming Chemical Co., Ltd.), and add distilled water to a final volume of 1 liter to obtain electroplating solution D2.

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Abstract

The invention relates to full sulfate type trivalent chromium electroplating solution. The electroplating solution includes chromic sulfate, potassium sulfate and / or sodium sulfate, boracic acid, complexing agent and water, wherein, the electroplating solution also includes additive A and additive B, the additive A is selected from one or more of OP emulsifier, water soluble borofluoride, water soluble silico fluoride, vinyl diamine acetic acid, cystine, 1,4-butynediol, thiourea and glycol; the additive B is selected from one or more of O-Sulfonylbenaylsuamine, glycerine, water soluble sulphosuccinate, Docusate sodium and water soluble alkyl ether sulfate. The electroplating solution provided by the invention ensures the current density scopes of the coating and the luminous area to be both improved to a great extent.

Description

technical field [0001] The invention relates to a trivalent chromium electroplating solution and an electroplating method using the electroplating solution, more particularly to a full sulfate type trivalent chromium electroplating solution and an electroplating method using the electroplating solution. Background technique [0002] The trivalent chromium coating has bright white color, high hardness and excellent mechanical properties. The dispersion and coverage of trivalent chromium plating are much higher than that of hexavalent chromium. 2 times that of chrome plating, the current efficiency is very high. In addition, the toxicity of trivalent chromium plating is only 1 / 100 of that of hexavalent chromium, which is one of the best electroplating processes to replace hexavalent chromium plating. [0003] The commonly used trivalent chromium electroplating solution system is divided into chloride system and sulfate system. During the chloride system electroplating process...

Claims

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Application Information

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