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Zinc alloy electroplating
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Zinc alloy electroplating : ウィキペディア英語版
Zinc alloy electroplating
Zinc alloy electroplating is an electrogalvanization process for corrosion protection of metal surfaces and increasing their wear resistance.
==History==
Modern development started during the 1980s with the first alkaline Zn/Fe (99.5%/0.5%) deposits and Zn/Ni (94%/6%) deposits. Recently, the reinforcement of the corrosion specifications of major European car makers and the End of Life Vehicles Directive (banishing the use of hexavalent chromium (CrVI) conversion coating) required greater use of alkaline Zn/Ni containing between 12 and 15% Ni (Zn/Ni 86/14).〔(European Directives ) (in French)〕
Only Zn/Ni (86%/14%) is an alloy while lower content of iron, cobalt and nickel leads to co-deposits. Zn/Ni (12%-15%) in nickel in acidic a and alkaline electrolytes is plated as the gamma crystalline phase of the binary diagram Zn-Ni.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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