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Need alternative for cadmium plating

What is the alternative plating for cadmium, used with steel and aluminium alloys and have a high corrosion resistance and electrically conductive.

Mohamad Galal
reverse engineering for spare parts - Cairo, Egypt
June 29, 2008

Hi, Mohamad. The most common substitute is a zinc alloy such as zinc-nickel, zinc-iron, zinc-cobalt, or tin-zinc. However, there is no such thing as a 'general purpose' alternative, and a substitution is never permissible without the explicit permission of the design authority because there may be other issues than corrosion resistance and conductivity. For example, unlike cadmium, the zinc alloys are not compatible with bare aluminum; their corrosion products can be bulky and sticky; and they do not offer the same lubricity and freedom from stick-slip.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
July 1, 2008

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