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Seeking blackening of stainless steel (304 or 316) component [California] 

May 6, 2008

I am looking to blacken a piece of 316 or 304 stainless steel which is approximately 13.5 x 3.5 x 0.25 inches. I am specifically looking for a sodium dichromate treatment. This webpage www.azom.com/details.asp?ArticleID=1142 states that "blackening to produce a non-reflective black oxide surface can be accomplished by several methods. Immersion in sulphuric acid/potassium dichromate solutions at 80 to 99°C or immersion in a molten salt bath of sodium dichromate at 400°C are two common methods."

Shipping the piece anywhere in the US is not a problem.

Fenton Glass
scientific research - Foothill Ranch, CA, USA