Anti-corrosion treatment process

Details Anti-corrosion treatment process Anti-corrosion treatment process

1983-09-07

1985-07-02

Silverberg, Sam

Metal treatment

Compositions

Heat treating

376305, 376306, 427380, C23F 704

Patent

active

045266263

ABSTRACT:
An anti-corrosion treatment process for protecting alloys containing chromium and cobalt and/or nickel against corrosion by superheated water, which consists of heating the alloy in contact with a solution containing EDTA and ferrous ions to within a temperature range that forms a thick, chromium oxide-rich glassy film over the surface of the alloy. Where the EDTA is present in the form of one of its disubstituted alkali salts, the solution is preferably heated to 200.degree. C. to 210.degree. C. under chemically reducing conditions. Further heating of the solution to 225.degree.-250.degree. C. improves the corrosion resistance of the film, by increasing its iron oxides content and converting at least part of its structure to microcrystalline. Films produced by the present process are found to have a very low nickel and cobalt content.

REFERENCES:
patent: Re30796 (1981-11-01), Lesinski
patent: 3699052 (1972-10-01), Petrey

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