Electrolyte for producing conversion coatings

Details Electrolyte for producing conversion coatings Electrolyte for producing conversion coatings

1991-04-25

1992-03-10

Tufariello, T. M.

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Forming nonmetal coating

205327, C25D 1102, C25D 1106

Patent

active

050947273

ABSTRACT:
By means of an electrolyte free of ammonia, cyanide, and fluoride, hence low in harmful substances and inoffensive to the environment, optically black coatings having a thickness of less than 10 microns and substantially equal optical absorption and thermal emission capability can be produced on light metals or alloys thereof by spark discharge anodizing. In comparison with prior art conversion coatings obtained by spark discharge anodizing, the coatings produced with this electrolyte have a substantially lower roughness of this electrolyte in spark discharge anodizing provides an alternative mode of coating particularly for structural components or subassemblies of complicated shapes having greater requirements for accuracy to gauge.

REFERENCES:
patent: 4869789 (1989-09-01), Kurze

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