Oxidation of chromium surfaces

Details Oxidation of chromium surfaces Oxidation of chromium surfaces

1975-03-24

1976-06-15

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 315, C23F 702

Patent

active

039635287

ABSTRACT:
A method for forming an oxidized chromium film on the surface of chromium metal in a controlled manner which involves the use of a permanganate solution. The chromium metal film is first subjected to a basic hydrogen peroxide solution. The chromium surface is then removed from the hydrogen peroxide solution and immersed in an aqueous permanganate solution maintained at a temperature less than about 100.degree. C. for a time preferably within 1 to 5 minutes. At this time the chromium film has been oxidized to the desired thickness depending upon the time and temperature at which the surface has been subjected to the solutions. The surface is removed from the permanganate solution and dried. Should additional thickness of chromium oxide films be desired, the surface is intermittently subjected to the permanganate solution and dried to build up the desired thickness of chromium oxide.

REFERENCES:
patent: 2312066 (1943-02-01), Batcheller
patent: 2317205 (1943-04-01), Lowit
patent: 3698928 (1972-10-01), Blome

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