High temperature resistant diffusion coating

Details High temperature resistant diffusion coating High temperature resistant diffusion coating

1973-05-07

1976-04-06

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 627, 427203, C23F 714

Patent

active

039486877

ABSTRACT:
Low temperature aluminum diffusion is more uniform when effected with a pack energized by aluminum chloride or other material that does not generate nitrogen, and gives food protection against marine corrosion of steels, and 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 and dispersed polytetrafluoroethylene particles. Such coating mixture is best applied over porous pre-coating of colloidal inert particles. Aluminized superalloy can be heated in air to whiten it, then cleaned to give product having more ductile case. Such coated superalloy can also be stripped of coating by aqueous HNO.sub.3 --HF--CrO.sub.3 bath.

REFERENCES:
patent: 2562118 (1951-07-01), Osdal
patent: 2619443 (1952-11-01), Robinson
patent: 2707703 (1955-05-01), Dorst
patent: 3096160 (1963-07-01), Puyear
patent: 3248249 (1966-04-01), Collins
patent: 3284319 (1966-11-01), Hill
patent: 3286684 (1966-11-01), Aves

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