Chromic-phosphoric acid coated aluminized steel

Details Chromic-phosphoric acid coated aluminized steel Chromic-phosphoric acid coated aluminized steel

1973-10-09

1976-04-06

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

29195, 291962, B32B 1518

Patent

active

039486893

ABSTRACT:
Low temperature aluminum diffusion is of better quality when effected with a pack energized by aluminum chloride or other material that does not generate nitrogen and is shielded from contacting the work pieces until after the pack is heated to energizing temperatures. The resulting aluminizing very effectively protects steels against corrosion in marine atmospheres, particularly when there is a chromate-type coating applied over the aluminizing. Highly effective chromate-type coating mixture consists essentially of aqueous solution of chromic and phosphoric acid also containing magnesium salts of said acids with or without dispersed polytetrafluoroethylene particles. The salts of divalent metals such as calcium, zinc, strontium, manganese, cobalt and nickel whose chromates are soluble in acid, can be used instead of or in addition to the magnesium. Such coating mixture is best applied over porous pre-coating of colloidal inert particles.

REFERENCES:
patent: 2490543 (1949-12-01), Robertson
patent: 2490549 (1949-12-01), Schultz
patent: 2562118 (1951-07-01), Osdal
patent: 2917818 (1959-12-01), Themson
patent: 3248249 (1966-04-01), Collins
patent: 3248251 (1966-04-01), Allen
patent: 3284319 (1966-11-01), Hill
patent: 3618193 (1971-11-01), Anderson
patent: 3637354 (1972-01-01), Zaremski
patent: 3713903 (1973-01-01), Zaremski

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