Quote:
Originally Posted by al76slc
The problem is that our parts are already pre-plated with a shiny nickel finish over brass. The customer is finding that the black oxide plating is not adhering well over the nickel plated surface.
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Black oxide is utilized on plain steel or iron. It will not work on nickel very well and it will certainly not work if you stripped the nickel and tried to use it on brass.
The use of nickel effectively eliminates any need for black oxide. Both provide corrosion protection, although the brass hardly needs it.