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Copper-zinc alloy electroplating bath and plating method using the copper-zinc alloy electroplating bath

A technology of zinc alloy and electroplating bath, which is applied in the field of copper-zinc alloy electroplating bath, can solve the problems of cyanide toxicity and large burden of cyanide-containing waste liquid treatment, and achieve the effect of improving productivity

Inactive Publication Date: 2010-10-27
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since conventional plating baths contain a large amount of cyanide, the toxicity of cyanide is a big problem, and the burden of disposal of cyanide-containing waste liquid is also a big problem

Method used

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  • Copper-zinc alloy electroplating bath and plating method using the copper-zinc alloy electroplating bath
  • Copper-zinc alloy electroplating bath and plating method using the copper-zinc alloy electroplating bath
  • Copper-zinc alloy electroplating bath and plating method using the copper-zinc alloy electroplating bath

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Embodiment

[0031] Hereinafter, the present invention will be described in more detail using examples.

[0032] According to the composition of the copper-zinc alloy electroplating bath shown in following tables 1~3 respectively, prepare the copper-zinc alloy electroplating bath of each embodiment; According to the plating condition in following table 1~3, carry out copper-zinc alloy electroplating bath Plating treatment. Immediately after preparing the plating bath, the plating treatment was carried out, and the plating deposition amount and alloy composition were analyzed. In addition, use a laser microscope to observe the roughness of the coating surface to obtain roughness parameters Ra, Rv, and Rz. At the same time, the current density range in which a glossy and uniform alloy layer can be obtained was obtained. The obtained results are collectively described in the following Tables 1-3.

[0033]

[0034] Ra was calculated from the following equation of the centerline average ...

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Abstract

Disclosed is a copper-zinc alloy electroplating bath that can form a uniform and glossy alloy layer having a contemplated composition without using any cyanide compound even at a higher current density than the current density in the prior art technique and can realize excellent productivity. The copper-zinc alloy electroplating bath contains a copper salt, a zinc salt, an alkali metal pyrophosphate, and at least one material selected from amino acids or salts thereof, and has a pH value of 8.5 to 14. The pH value is preferably 10.5 to 11.8. The concentration of the amino acid or the salt thereof is preferably 0.08 mol / L to 0.22 mol / L, more preferably 0.1 mol / L to 0.13 mol / L. Histidine or salts thereof are preferred for use as the amino acid or the salt thereof.

Description

technical field [0001] The present invention relates to a copper-zinc alloy electroplating bath and a plating method using the same. Specifically, it relates to a copper-zinc alloy electroplating bath which does not contain cyanide and can form a glossy and uniform alloy layer even at a high current density and a plating method using the same. Background technique [0002] At present, copper-zinc alloy plating is widely used industrially as decorative plating in order to impart a brassy metallic luster and color tone to metal products, plastic products, ceramic products, and the like. However, since the conventional plating bath contains a large amount of cyanide, the toxicity of cyanide is a big problem, and the burden of disposal of cyanide-containing waste liquid is also a big problem. [0003] As a solution to this problem, a large number of copper-zinc alloy plating methods that do not use cyanide have been reported so far. For example, continuous plating is a practic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/58
CPCC25D3/38C25D3/58
Inventor 山本由纪子大场丈司丰泽真一
Owner BRIDGESTONE CORP
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