Process for producing improved, protective conversion coatings o

Details Process for producing improved, protective conversion coatings o Process for producing improved, protective conversion coatings o

1976-06-16

1977-07-19

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 627, C23F 726

Patent

active

040366677

ABSTRACT:
This invention relates to the use of sodium nitroferricyanide as a substitute for sodium or potassium ferricyanide in nitric acid acidified, hexavalent chromium-fluoride solutions for the treatment of aluminum and its alloys (wherein aluminum is the principal constituent), providing coatings having excellent corrosion-resistance, reduced surface powdering, and improved adhesion and appearance. Small amounts of sodium vanadate may also be added to effectively modify the characteristics of the deposited coatings. Controlled build-up of the protective coatings, produced by chemical reaction between the active components of the solution and the aluminum or aluminum alloy surfaces, are readily accomplished within a temperature range of 65.degree.-85.degree. F. and an immersion time of 5-10 minutes.

REFERENCES:
patent: 3066055 (1962-11-01), Pimbley
patent: 3520736 (1970-07-01), Newell

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