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A kind of trivalent chromium environmental protection electroplating solution and using method thereof

A technology of electroplating solution and trivalent chromium, which is applied in the field of trivalent chromium environmental protection electroplating solution, to achieve the effect of smooth surface, dense crystallization and reducing the health hazards of electroplating workers

Active Publication Date: 2020-07-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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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 to provide a kind of trivalent chromium electroplating solution and its use method, by introducing a special component into the formula of conventional trivalent chromium electroplating solution, effectively reduce the surface tension of the coating in the electroplating process, and improve the dispersibility of the electroplating solution , and then solve the problem of edge effect in the electroplating process, thereby increasing the thickness of the coating to 80 microns and the density, and the coating has a good bonding force with the substrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In the present embodiment, electroplating solution composition: Chromium chloride 1.5mol / L, citric acid 1.0mol / L, aminoacetic acid 1.0mol / L, sodium chloride 0.5mol / L, polyethylene glycol (200): 0.2mol / L L, special component 0.2mol / L, the rest is water. Wherein, by weight percentage, the specific composition and content of the special components are as follows: polyacrylamide 10%, eicosanol 20%, dimethyl sulfoxide (DMSO) 70% uniformly mixed.

[0019] Mix the above substances evenly to prepare the electroplating solution, the pH value of the electroplating solution is 3.0, and the cathode current density is 35A / dm 2 , the temperature of the electroplating solution is 30°C, the electroplating time is 60min, and the coating thickness is 85μm. The coating is dense and bright.

Embodiment 2

[0021] In the present embodiment, the electroplating solution composition: chromium chloride 1.8mol / L, citric acid 1.2mol / L, lactic acid 1.0mol / L, sodium chloride 0.2mol / L, palladium chloride 0.3mol / L, polyethylene glycol (1000): 0.6mol / L, special component 0.3mol / L and the rest is water. Wherein, by weight percentage, the specific composition and content of the special components are as follows: 15% of α-olefin sulfonate, 15% of pentacosanol, and 70% of dimethylformamide (DMF) are uniformly mixed.

[0022] Mix the above substances evenly to prepare the electroplating solution, the pH value of the electroplating solution is 3.2, and the cathode current density is 40A / dm 2 , the temperature of the electroplating solution is 40°C, the electroplating time is 60min, and the coating thickness is 90μm. The middle part of the coating is of good quality and dense.

Embodiment 3

[0024] In this embodiment, the composition of the electroplating solution: chromium chloride 1.0mol / L, malic acid 1.0mol / L, succinic acid 1.0mol / L, aminoacetic acid 0.5mol / L, maleic acid 0.5mol / L, chlorine Sodium chloride 0.5mol / L, magnesium chloride 0.5mol / L, palladium chloride 0.5mol / L, polyethylene glycol (2000): 0.5mol / L, polyethylene glycol (4000): 0.5mol / L, special components 0.5mol / L, the rest is water. Wherein, by weight percentage, the specific composition and content of the special components are as follows: 10% fatty acid sulfoalkyl ester, 15% eicosanol, and 75% acetonitrile are uniformly mixed.

[0025] Mix the above substances evenly to prepare the electroplating solution, the pH value of the electroplating solution is 2.5, and the cathode current density is 30A / dm 2 , the temperature of the electroplating solution is 50°C, the electroplating time is 90min, and the coating thickness is 90μm. The coating is dense and bright.

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Abstract

The invention relates to the field of environment-friendly electroplating hard chromium, in particular to a trivalent chromium environment-friendly electroplating solution and a using method thereof.The electroplating solution comprises, by weight, 0.5-2.0mol / L of chromium chloride, 1.5 to 3.0mol / L of a coordination agent, 0.5 -2.5mol / L of conductive salt, 0.2-1.0mol / L of a dispersing agent, 0.1-0.5mol / L of a special component and the balance water. The using method is characterized in that under the determined acidity, temperature and current density, a chromium coating with the thickness of more than 80 microns is prepared; in the using process of the electroplating solution, the acidity PH is controlled to be between 2 and 4, the temperature is controlled between 30 DEG C and 50 DEG C, and the current density is controlled to be 30 to 40 A / dm2; and then, the special component is introduced into a conventional trivalent chromium electroplating solution formula, so that surface tension of the coating in the electroplating process is effectively reduced, dispersibility of the electroplating solution is improved, the edge effect problem in the electroplating process is further solved, then, the thickness of the coating is increased to 80 microns, density is improved, and binding force between the coating and a substrate is good.

Description

technical field [0001] The invention relates to the field of environment-friendly electroplating hard chromium, in particular to a trivalent chromium environment-friendly electroplating solution and a use method thereof. Background technique [0002] The electroplated chromium layer has high hardness, good wear resistance and corrosion resistance, and has excellent decorative properties. It is often used as a decorative coating for electronic and electrical equipment, hardware tools, etc., and functions such as pistons, molds, and shafts. Non-toxic coating, widely used. At present, most of the electroplated chromium layers in the world use the hexavalent chromium electroplating process, which is simple, easy to maintain, and has good coating performance. However, hexavalent chromium ions are very toxic. Excessive intake can cause skin ulcers, damage liver and kidney functions, and have a strong carcinogenic effect. The U.S. Environmental Protection Agency has identified he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/06
CPCC25D3/06
Inventor 张博赵焕刘伟华李庆鹏刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI