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"Caustic black oxide without tank immersion - could this work?"
November 29, 2016
Q. I have a friend who is a sculptor. She is working on this magnificent sculpture of a horse, made out of mild steel rods, welded together.
I was wondering; could she possibly have luck putting a black oxide coat on it by painting it with a solution of NaOH/NaNO3, and heating gently with a torch? I do not expect that this would produce the kind of uniform coat expected in a job shop production piece. In an art work this might not even be desirable.
Has anyone ever tried something like this?
Consultant - The Bronx, New York
A. Hi Dave. With millions of firearms black oxided and then touched up with cold blackening solutions, I think we'd have heard of it if it was practical to do hot black oxide without immersion. So I'd suggest experimenting with cold blackening.
Ted Mooney, P.E. RET
Aloha -- an idea worth spreading
finishing.com - Pine Beach, New Jersey