[QQ-N-290A]
There is a nickel finish for almost any
requirement. Nickel can be deposited soft or hard, dull to bright. The
difference is dependent on process used and conditions employed in plating.
The hardness can range from 150 -
500 Vickers. Can range in appearance from matte, light gray (almost white)
to a condition resembling stainless steel. Corrosion resistance is a function
of thickness. Has a low coefficient of thermal expansion. Nickel plating
is magnetic.
All steel parts having a hardness
of Rc 40 or greater require a post bake at 375°F ± 25 for 3
hours minimum. Note: All steel parts having a tensile strength of 220,000
or greater shall not be nickel plated without specific approval of procuring
agency.
Class 1: For corrosion protection.
Plating shall be applied over an underplating of copper or yellow brass
on zinc and zinc based alloys.
In no case shall the copper underplate
be substituted for any part of the specified nickel thickness.
Class 2: For engineering applications.
Grade A : .0016" minimum thickness
Grade B: .0012" minimum thickness
Grade C: .0010" minimum thickness
Grade D: .0008" minimum thickness
Grade E: .0006" minimum thickness
Grade F: .0004" minimum thickness
Grade G: .0002" minimum thickness
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