Blackening process for stainless steels

Details Blackening process for stainless steels Blackening process for stainless steels

1990-10-09

1992-04-14

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148242, 148325, C23C 2224

Patent

active

051044633

ABSTRACT:
A corrosion resistant stainless steel article is provided with a substantly uniform black oxide coating over the surface thereof, the article being formed from a steel alloy in martensitic structure which is treated in a boiling aqueous alkaline-chromate-oxidizing solution containing sodium hydroxide, sodium nitrate and sodium dichromate at a temperature in the range from about 230.degree. F. to about 260.degree. F. for 30 to 60 minutes.

REFERENCES:
patent: 3915759 (1975-10-01), Smollett

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