Trivalent chromium electroplating solution and an electroplating process with the solution

a technology of trivalent chromium and electroplating solution, which is applied in the field of trivalent chromium electroplating solution and an electroplating process with the solution, can solve the problems of difficult to obtain thick chromium deposits and lack of stability, and achieve high current density, low toxic, and high current efficiency

Inactive Publication Date: 2008-07-17
CHANG GUNG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0005]The main objective of this invention is to provide a low toxic trivalent chromium electroplating bath, which can be used to achieve chromium deposit by electroplating with high current efficiency and high electroplating current density; meanwhile, an electroplating process of using the trivalent chromium electroplating solution is provided.

Problems solved by technology

Nowadays, the chromium deposit is mainly obtained from the plating bath containing hexavalent chromium ion which is highly toxic in nature.
However, lack of stability and difficult to obtain thick chromium deposit are presently the main drawbacks for trivalent chromium electroplating.

Method used

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  • Trivalent chromium electroplating solution and an electroplating process with the solution
  • Trivalent chromium electroplating solution and an electroplating process with the solution

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Embodiment Construction

[0014]A trivalent chromium electroplating solution in accordance with the present invention contains at least one trivalent chromium salt for electroplating a chromium deposit on a workpiece. To obtain the chromium deposit on a workpiece, electroplating is conducted with the bath containing low toxic trivalent chromium ions to substitute the bath with highly toxic hexavalent chromium ions. Therefore, the electroplating process of the present trivalent chromium electroplating bath is an environmental friendly method.

[0015]Owing to its high hardness, superior oxidation and wear resistance, chromium coating is widely used for surface finish of precision mechanical parts, mould, and surgical tool. According to the thickness, two types of chromium deposits xould be classified. The first type is decorative chromium deposit and the other type is hard chromium deposit. The decorative chromium deposit usually has a thickness of about 0.1-0.5 μm. The decorative chromium is mainly used for dec...

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Abstract

A trivalent chromium electroplating solution in accordance with the present invention contains at least one trivalent chromium salt for electroplating a chromium coating layer on a workpiece. By using the low toxic trivalent chromium to substitute highly toxic hexavalent chromium, an electroplating process of the present trivalent chromium electroplating solution has less pollution.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an electroplating bath contained with low toxic trivalent chromium ions to obtain chromium deposit through electroplating.[0003]2. Description of the Prior Art[0004]Because of high hardness, excellent wear and oxidation resistance, the chromium deposit is commonly used in industrial applications. Nowadays, the chromium deposit is mainly obtained from the plating bath containing hexavalent chromium ion which is highly toxic in nature. Thus, to develop alternative surface coatings for replacement of hard and decorative chromium deposits has been much attracted in recent years. The plating bath with low toxic trivalent chromium ions could be a suitable alternative electroplating method for obtaining chromium deposit. However, lack of stability and difficult to obtain thick chromium deposit are presently the main drawbacks for trivalent chromium electroplating. In this invention, a stable tr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25D5/34C25D3/06
CPCC25D5/34C25D3/06
Inventor HUANG, CHING ANHSU, CHUN CHINGLEU, UI WEI
Owner CHANG GUNG UNIVERSITY
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