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AMS 2412 copper undercoat

2005

I am a plater and I have this question.

In AMS2412 3.2.1 says " Silver shall be plated over a preliminary plating of copper of .0005 inch maximum. The copper strike may be omitted in plating copper and copper alloys, except for copper alloys containing zinc in quantities of 30% or more by weight. A nickel flash shall be used before the copper strike when plating corrosive corrosive-resistant steel.

My question is " copper strike " in the above statement- does it mean the plating should be done in a strike bath or could it be done in a strike as well as copper plating bath.
Or does it mean it does not matter as long the plating is less than .0005 max. Please help.

Ram. Gar
ABB plating - Livonia, Michigan

The ASTM guide on electroplating terminology might be something you should reference in interpreting this use of the term "strike." In general, strikes are much, much less than 1/2 mil in thickness. Activating stainless with a nickel strike is indeed a strike, however, 1/2 mil of copper to be used as a diffusion barrier is an underplate.

Milt Stevenson, Jr.
Syracuse, New York
2005

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