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Trivalent chromium electroplating solution and preparing method thereof

A technology of trivalent chromium and solution is applied in the field of trivalent chromium electroplating solution and its preparation, which can solve the problems of hexavalent chromium ion health and environmental protection, and achieves reduction of the health hazards of electroplating workers, dense crystallization, combined with good effect

Inactive Publication Date: 2017-11-03
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 novel trivalent chromium electroplating solution and its preparation method to solve the problem that the existing hexavalent chromium ion toxicity has a greater impact on health and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, the components of the electroplating solution: chromium chloride 0.8mol / L, chromium sulfate 0.3mol / L, benzoic acid 0.3mol / L, oxalic acid 0.5mol / L, sulfonylurea 1.5mol / L, citric acid 0.5mol / L L, sodium chloride 0.5mol / L, nonylphenol polyoxyethylene ether (NP-10) 4g / L, acrylonitrile-butadiene-styrene copolymer (ABS) 5g / L, and the rest is water. Mix the above substances evenly to prepare an electroplating solution, the pH value of the solution is 1.8, and the cathode current density is 35A / dm 2 , bath temperature 30 ℃, electroplating time 60min, coating thickness 75μm. The coating is dense and bright.

Embodiment 2

[0029] In this embodiment, the components of the electroplating solution: chromium chloride 0.8mol / L, chromium sulfate 0.2mol / L, benzoic acid 0.2mol / L, oxalic acid 0.4mol / L, sulfonylurea 2.0mol / L, ethylenediaminetetraacetic acid (EDTA) 0.5mol / L, sodium chloride 0.5mol / L, sodium lauryl sulfate (K12) 5g / L, polyethylene glycol (200) 6g / L, and the rest is water. Mix the above substances evenly to prepare an electroplating solution, the pH value of the solution is 2.0, and the cathode current density is 40A / dm 2 , bath temperature 40 ℃, electroplating time 60min, coating thickness 65μm. The middle part of the coating is of good quality and dense, and the end part is blackened.

Embodiment 3

[0031] In this embodiment, the components of the electroplating solution: chromium chloride 0.6mol / L, chromium sulfate 0.3mol / L, maleic acid 0.5mol / L, thioglycolic acid 0.5mol / L, sulfonylurea 2.0mol / L, ethyl Diaminetetraacetic acid (EDTA) 0.5mol / L, sodium chloride 0.5mol / L, sodium lauryl sulfate (K12) 4g / L, polyethylene glycol (1000) 5g / L, and the rest is water. Mix the above substances evenly to prepare an electroplating solution, the pH value of the solution is 1.5, and the cathode current density is 40A / dm 2 , bath temperature 40 ℃, electroplating time 60min, coating thickness 80μm. The coating is dense and blackened at the end.

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Abstract

The invention relates to the field of environment-friendly electroplating hard chromium, in particular to a novel trivalent chromium electroplating solution and a preparing method thereof. The problem that existing hexavalent chromium ions greatly influence health and environment protection is solved. The electroplating solution includes 0.5 mol / L-1.0 mol / L of chromium chloride, 0.2 mol / L-0.5 mol / L of chromium sulfate, 1.5 mol / L-3.0 mol / L of a coordination agent, 0.1 mol / L-1.0 mol / L of a buffer agent, 0.5 mol / L-2.5 mol / L of conducting salt, 2 g / L-10 g / L of a wetting agent, 2 g / L-10 g / L of a dispersing agent and the balance water. By means of the novel trivalent chromium electroplating solution and the preparing method thereof, a blend system for different kinds of trivalent compounds of chromium is adopted, a special additive is used in the electroplating solution under a conventional electroplating device, the thickness of a chromium plating layer is effectively increased to 60 microns or above, crystals are compact, and the bonding force with a base body is good.

Description

technical field [0001] The invention relates to the field of environment-friendly electroplating hard chromium, in particular to a novel trivalent chromium electroplating solution and a preparation 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 hexavalen...

Claims

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Application Information

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Patent Type & Authority Applications(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
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