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Sulphate trivalent chromium electroplating pollution as well as preparation process thereof and electroplating process thereof

A technology of production process and electroplating process, which is applied in the fields of sulfate trivalent chromium electroplating solution and its production process and electroplating process, and can solve the problems of uneven color plating of workpieces, large power consumption, and slow deposition rate, etc.

Inactive Publication Date: 2019-04-19
陈建平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a trivalent chromium sulfate electroplating solution and its production process and electroplating process, which can obtain trivalent chromium with good appearance at a normal temperature of 25-40°C for workpieces electroplated by it. Chromium coating, the Lab color value of the coating can be adjusted freely within a certain range of data according to the needs of electroplating, which enables the color of the coating to be adjusted from silvery white to brownish black, and its electroplating solution has good stability and strong covering ability , the advantages of good throwing ability and environmental protection, the workpiece electroplated by the present invention can enhance its corrosion resistance, hardness, conductivity, smoothness, heat resistance and wear resistance, and the deposition rate of its chromium layer reaches 0.1 -0.2 microns / min, the thickness of the coating reaches more than 1 micron, and the current density range can be expanded to 5-75 A / dm 2 , under the condition of ensuring the quality of the process, it can save electric energy and reduce the cost of use. It not only solves the problem that the chloride system in the hexavalent chromium solution and the trivalent chromium electroplating solution system is used to electroplate the workpiece, which will affect the environment. At the same time, it also solves the current problem of using the sulfate system in the trivalent chromium electroplating solution system to electroplate the workpiece, which has the advantages of large power consumption, slow deposition rate, thin coating thickness, narrow current density range and workpiece color electroplating. uneven problem

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  • Sulphate trivalent chromium electroplating pollution as well as preparation process thereof and electroplating process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A sulfate trivalent chromium electroplating solution, which comprises the following components by weight: conductive salt 30%, A preparation 20%, B preparation 6%, C preparation 0.5%, D preparation 1%, wetting agent 0.3%, all the other are pure water.

[0040] The conductive salt is composed of 46% potassium sulfate, 15% sodium sulfate, 8% ammonium sulfate, 9% magnesium sulfate and 22% boric acid in weight ratio.

[0041] Described A preparation comprises following weight proportion composition: 45% chromium sulfate, the complexing agent of 16%, all the other are the pure water that makes A preparation usefulness;

[0042] The B preparation is a mixture of formic acid, glycolic acid, malic acid, tartaric acid and nitrilotriacetic acid with a weight ratio of 10-50%, and the rest is pure water for making the B preparation.

[0043] The C preparation includes 2-20% thiourea by weight, and the rest is pure water for preparing the C preparation. The thiourea can be thioure...

Embodiment 2

[0047] A kind of sulfate trivalent chromium electroplating solution, it comprises following composition by weight ratio: conductive salt 35%, A preparation 16%, B preparation 8%, C preparation 1.5%, D preparation 1.5%, wetting agent 0.5%, all the other are pure water.

[0048] The conductive salt is composed of 42% potassium sulfate, 19% sodium sulfate, 6% ammonium sulfate, 5% magnesium sulfate and 28% boric acid by weight.

[0049] The A preparation includes the following components by weight: 38% chromium sulfate, 19% complexing agent, and the rest is pure water for making the A preparation.

[0050] The B preparation includes a mixture of lactic acid, malic acid and nitrilotriacetic acid with a weight ratio of 10-50%, and the rest is pure water for making the B preparation.

[0051] The C preparation includes a mixture of thiourea and sodium thiosulfate with a weight ratio of 2-20%, and the rest is pure water for making the C preparation.

[0052] The D preparation includ...

Embodiment 3

[0055] A kind of sulfate trivalent chromium electroplating solution, it comprises following composition by weight ratio: conductive salt 23%, A preparation 25%, B preparation 10%, C preparation 2%, D preparation 0.5%, wetting agent 0.6%, all the other are pure water.

[0056] The conductive salt is composed of 38% potassium sulfate, 20% sodium sulfate, 9% ammonium sulfate, 10% magnesium sulfate and 23% boric acid by weight.

[0057] Described A preparation comprises following weight proportion composition: 32% chromium sulfate, 12% complexing agent, all the other are the pure water that makes A preparation usefulness;

[0058] The B preparation includes a mixture of lactic acid, malic acid, tartaric acid and nitrilotriacetic acid with a weight ratio of 10-50%, and the rest is pure water for making the B preparation.

[0059] The C preparation includes 2-20% sodium thiosulfate by weight, and the rest is pure water for preparing the C preparation.

[0060] The D preparation in...

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Abstract

The invention relates to a sulphate trivalent chromium electroplating pollution which comprises conductive salt, a preparation A, a preparation B, a preparation C, a preparation D, a wetting agent andpure water. At the normal temperature of 25-40 DEG C, an electroplated workpiece can be adopted to obtain a trivalent chromium coating with good appearance, and the thickness of the coating can be 1micron or more; the electroplated workpiece is strengthened in corrosion resistance, hardness, electrical conductivity, smoothness, heat resistance and wear resistance; a deposition rate of a chromiumlayer is 0.1-0.2 micron per minute; and electric energy can be saved, and use cost can be reduced in case of guaranteeing process quality. The Lab colour of the coating can be freely regulated withina range of L being greater than 65 and smaller than 80, a being greater than (-)1 and smaller than 1, and b being greater than 2 and smaller than 6, so that the colour of the coating can be regulatedto be brownish black from sliver, and the coating has the advantages of being good in stability, strong in covering power, good in uniform-coating ability and environmentally friendly.

Description

technical field [0001] The invention relates to a sulfate trivalent chromium electroplating solution and its production process and electroplating process. Background technique [0002] Because of its good hardness, wear resistance, corrosion resistance and decorative properties, chrome plating has become one of the most widely used plating types. The traditional hexavalent chromium solution is very polluting to the environment, and the governments of various countries are strengthening legislation and management, so that hexavalent chromium will be phased out gradually. The trivalent chromium plating solution is more environmentally friendly than the hexavalent chromium plating solution. Therefore, it is imperative to develop an environmentally friendly trivalent chromium plating solution that can replace hexavalent chromium plating. [0003] At present, the commonly used trivalent chromium electroplating solution systems are divided into chloride system and sulfate system...

Claims

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Application Information

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IPC IPC(8): C25D3/06
CPCC25D3/06
Inventor 陈建平刘妍霞文剑
Owner 陈建平
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