Letter 1011

Zinc-Cobalt as a replacement for Cadmium Plating

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Is there any current information on the use of electrodeposited zinc-cobalt (ASTM B 840) as a replacement for cadmium plating (QQ-P-416F) on fasteners?, in the aerospace industry? Also, where does zinc-cobalt fit in the galvanic series with respect to aluminum alloys-5052, 6061, etc..

Joe Pesik BFG-Rosemount Aerospace

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