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What is blackened steel?





Q. What is blackened steel; a finish? What is best way to specify this?
If a finish, is it typically done to a specific type of steel for this effect?
Eg. blackened steel treads and risers for a stair.
Thanks

Ann Marciano
Specifier - Morganville, New Jersey
2007


A. I don't think that "blackened steel" is a codename or special industry lingo for anything, Ann; I think it really just means steel that has been blackened in some way. So "black oxided" may be as good a definition as any. In this process the steel is cleaned, acid activated, then dipped into a vat of hot strong caustic plus some nitrates or other oxidizers, which forms a black oxide product on the surface. While it's applicable to most any kind of steel, I don't think it's terribly durable or very rust resistant. So if you want a more durable coating you may need to specify a black nickel plating, black chrome plating, or zinc plating with black chromate conversion coating.

Ted Mooney, finishing.com
Ted Mooney, P.E.

Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey
2007


thumbs up sign Thank you Ted.

Ann Marciano [returning]
- Morganville, New Jersey
2007




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