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Trivalent-chromium electroplating solution

A trivalent chromium solution technology, applied in the field of electroplating, can solve the problems of easy hydrolysis, hydroxylation, oxygenation, difficulty in thickening the coating, and low tolerance of impurities, and achieve dense crystallization, low inertness, and high tolerance of impurities Effect

Inactive Publication Date: 2020-05-05
江门市顺高电镀有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 as a functional coating for pistons, molds, shafts, etc. Plating layer is widely used. Most of the electroplating chromium layers in the world now use hexavalent chromium electroplating process. The toxicity of trivalent chromium is 100 times less than that of hexavalent chromium. Trivalent chromium electroplating technology is considered to be a promising Replacing the environmental protection technology of hexavalent chromium electroplating, according to the existing technology, the composition of the trivalent chromium plating solution is complex, the tolerance to impurities is low, the maintenance of the plating solution is difficult, and because the trivalent chromium ion complex is relatively inert, it is prone to hydrolysis, Hydroxylation, oxygenation and other reactions make it difficult to thicken the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A trivalent chromium electroplating solution, the composition of the plating solution is: chromium chloride 1.3mol / L, complexing agent 3.1mol / L, buffering agent 0.9mol / L, conductive salt 2.1mol / L, organic additive 36g / L, the rest for water.

Embodiment 2

[0015] A kind of trivalent chromium electroplating solution, plating solution composition is: Chromium chloride 1.4mol / L, complexing agent 3.3mol / L, buffering agent 1.1mol / L, conductive salt 2.3mol / L, organic additive 38g / L, the rest for water.

Embodiment 3

[0017] A trivalent chromium electroplating solution, the composition of the plating solution is: chromium chloride 1.5mol / L, complexing agent 3.5mol / L, buffering agent 1.2mol / L, conductive salt 2.5mol / L, organic additive 40g / L, the rest for water.

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PUM

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Abstract

The invention discloses a trivalent-chromium electroplating solution. The plating solution comprises the following components: chromium chloride of 1.3 to 1.5 mol / L, coordination agent of 3.1 to 3.5 mol / L, buffering agent of 0.9 to 1.2 mol / L, conducting salt of 2.1 to 2.5 mol / L, organic additive of 36 to 40 g / L and the balance of water. The trivalent-chromium electroplating solution provided by the invention is simple in cost, high in tolerance to impurities, simple in maintenance of plating solution and low in inertia.

Description

technical field [0001] The invention relates to the field of electroplating, in particular to a trivalent chromium electroplating solution. 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 as a functional coating for pistons, molds, shafts, etc. Plating layer is widely used. Most of the electroplating chromium layers in the world now use hexavalent chromium electroplating process. The toxicity of trivalent chromium is 100 times less than that of hexavalent chromium. Trivalent chromium electroplating technology is considered to be a promising Replacing the environmental protection technology of hexavalent chromium electroplating, according to the existing technology, the composition of the trivalent chromium plating solution is complex, the tolerance ...

Claims

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Application Information

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IPC IPC(8): C25D3/06
CPCC25D3/06
Inventor 王志和
Owner 江门市顺高电镀有限公司