Black coating for Nickel Silver?
After having bought 65-18 nickel silver component parts done in a black titanium PVD process, the manufacturer has discontinued that option. This leaves me in a dilemma as to how to obtain a black coating that is durable. Since the use of these parts is quite limited it is not feasible to send them out for PVD, or any commercial process for that matter. I have done various chemical conversion techniques on nickel silver, and while some are perfect executions of the color, none are very durable. What I need almost has to be something that could be done as an in-house process. Any suggestions?
- Conway, Arkansas, USA
You probably already know that most sulfide blackening processes leave a very thin coating that wears quickly (which is why we are able to produce those nice 'relief' finishes with black in the recesses and brightness on exposed surfaces). There are both black nickel and black chrome plating processes that may meet your needs, but doing it in house would indeed involve you with wastewater treatment issues.
Ted Mooney, P.E.
Pine Beach, New Jersey
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