Nickel Finishing Plating QQ-N-290 Specification
QQ-N-290A, FEDERAL SPECIFICATION: NICKEL PLATING (ELECTRODEPOSITED) (12 NOV 1971) [S/S BY SAE-AMS-QQ-N-290]., This specification covers the requirements for electro-deposited nickel plating on steel, copper and copper alloys, and zinc and zinc alloys.
Nickel can be deposited soft or hard - dull or bright, hardness can range from 150 - 500 Vickers. Can be similar to stainless steel in color, or can be a dull gray or light gray (almost white) color. Corrosion resistance is a function of thickness. Has a low coefficient of thermal expansion, and is magnetic.
Class 1 For corrosion protection. With typical 0.0002" copper undercoating prior to the nickel plate.
Grade A .0016" min.
Grade B .0012" min.
Grade C .0010" min.
Grade D .0008" min.
Grade E .0006" min.
Grade F .0004" min.
Grade G .0002" min.
Class 2 .002" min.
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