Method of anodizing and sealing aluminum

Details Method of anodizing and sealing aluminum Method of anodizing and sealing aluminum

1984-09-04

1986-04-15

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

148 627, 204 383, 204 42, 136250, C25D 1108

Patent

active

045825882

ABSTRACT:
The disclosure relates to a method of sealing the surface of an aluminum member, such as an aluminum foil, from the environment by first placing the foil in an H.sub.2 SO.sub.4 bath to form an oxide which normally will not provide a total seal of the aluminum from the environment and then placing the aluminum member with oxide thereon in an H.sub.3 PO.sub.4 bath to close the pores in the oxide layer and provide sealing of the aluminum from the environment. This process also passivates the silicon.

REFERENCES:
patent: 3882000 (1975-05-01), Schwartz et al.
patent: 4002541 (1977-01-01), Streander
patent: 4049504 (1977-09-01), Chu et al.
patent: 4108736 (1978-08-01), Rigo et al.
patent: 4152222 (1979-05-01), Sheasby et al.
patent: 4451968 (1984-06-01), Jensen et al.

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