Process for forming a black oxide on aluminum alloys and a solut

Details Process for forming a black oxide on aluminum alloys and a solut Process for forming a black oxide on aluminum alloys and a solut

1996-02-22

1997-02-11

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148274, C23F 700

Patent

active

056016638

ABSTRACT:
A process for producing a black oxide coating on an aluminum or aluminum alloy component in which the process entails a single treatment step with a novel solution to rapidly produce the desired black oxide coating. The process includes cleaning the surface to be coated and then, without first undergoing anodization, treating the surface with a solution that develops a black oxide on the surface. The reactive component of the solution comprises distilled water containing chlorides, sulfates and bicarbonates of sodium salts. The remainder of the solution includes a catalyst and a substance for maintaining the pH of the solution at a level sufficient to promote the reaction between the surface of the aluminum alloy and the reactive constituents.

REFERENCES:
patent: 4354881 (1982-10-01), Tanikawa
patent: 4647392 (1987-03-01), Darden et al.

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