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Electroplating method of trivalent chromium diaphragm

A technology of trivalent chromium and diaphragm, applied in the field of electroplating, can solve problems such as trivalent chromium ion oxidation, and achieve the effects of cost reduction, overcoming environmental pollution problems, and avoiding anode chlorine evolution reaction.

Inactive Publication Date: 2012-09-19
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bottleneck problems such as chlorine gas precipitation on the anode and oxidation of trivalent chromium ions in the process of trivalent chromium electroplating

Method used

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  • Electroplating method of trivalent chromium diaphragm
  • Electroplating method of trivalent chromium diaphragm
  • Electroplating method of trivalent chromium diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The trivalent chromium plating solution in the cathode chamber is a chromium chloride system, the cathode is a copper plate, and the electrolyte in the anode chamber is sulfuric acid and an appropriate amount of Br - The aqueous solution, the anode is a lead-silver alloy, and the ion exchange membrane is a cation exchange membrane. After electroplating, the color of the chromium coating is bright, and no Cl is detected in the anode chamber. - , There is no chlorine gas precipitation on the anode, and no hexavalent chromium is detected in the trivalent chromium plating solution in the cathode chamber.

Embodiment 2

[0026] The trivalent chromium plating solution in the cathode chamber is a chromium sulfate system, the cathode is a copper plate, and the electrolyte in the anode chamber is sulfuric acid, sodium sulfate and an appropriate amount of Br - The aqueous solution, the anode is a lead-silver alloy, and the ion exchange membrane is a cation exchange membrane. After electroplating, the chromium coating is bright in color, and no hexavalent chromium is detected in the trivalent chromium plating solution in the cathode chamber.

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PUM

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Abstract

The invention discloses an electroplating method of a trivalent chromium diaphragm and belongs to the technical field of electroplating. The electroplating method comprises the processing steps of: dividing a plating tank into two parts, namely a cathode chamber and an anode chamber, by an ion exchange membrane; injecting trivalent chromium plating solution into the cathode chamber, injecting acid or neutral electrolyte into the cathode chamber, and then carrying out trivalent chromium electroplating, wherein precipitation of chlorine and generation of hexavalent chromium on the anode in the electroplating process of trivalent chromium can be removed, and only precipitation reaction of oxygen occurs on the anode. The electroplating method of the trivalent chromium diaphragm has the advantages of completely overcoming the negative effects of environment pollution, poor plating solution stability and the like caused by chlorine precipitation and hexavalent chromium generation on the anode and facilitating promotion and application of the trivalent chromium electroplating technique.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and in particular relates to a trivalent chromium diaphragm electroplating method. The trivalent chromium electroplating process is free of chlorine gas precipitation and hexavalent chromium formation. Background technique [0002] As a decorative or functional coating, electroplating chrome has a wide range of applications in the fields of automobiles, electronics, sanitary ware, and aerospace. The traditional hexavalent chromium plating technology produces a large amount of waste water and acid mist containing hexavalent chromium, which is highly toxic and polluting, and is subject to strict restrictions. The toxicity of trivalent chromium is only one percent of that of hexavalent chromium, and electroplating chromium with it as raw material is considered to be a sustainable green electroplating technology. [0003] Trivalent chromium electroplating technology can be divided into two ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/06
Inventor 王明涌王志栗磊刘玲张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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