Re: The Ford Books Fastener Guide
Black chromate can be real black.
The amount "brightener" in the zink aplied reflects in how shiny it comes out...lotīs of mixes in the plating to besides pure zink.
Manganese phosfate is another popular coting in automotive thatīs black...itīs mostly for rust protection and anti galling...camshafts is a common product where itīs used.
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