Surface pretreatment of aluminium and aluminium alloys prior to

Details Surface pretreatment of aluminium and aluminium alloys prior to Surface pretreatment of aluminium and aluminium alloys prior to

1985-09-03

1986-11-25

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 351, 204 33, 204 383, 204 387, 204 58, C25D 550

Patent

active

046247521

ABSTRACT:
A method of surface pretreatment for aluminium or aluminium alloys before adhesive coating, electroplating or painting comprises a first anodizing step using an acid selected to produce a dense-packed, thick-walled anodic oxide coating followed by an etching step to modify the outer surface of the oxide coating while leaving the inner part unaffected.
The anodizing acid may be sulphuric acid or chromic acid and the etch acid may be phosphoric acid, chromic acid or a mixture of sulphuric and chromic acids.

REFERENCES:
patent: 3017285 (1962-01-01), Wainer
patent: 3808000 (1974-04-01), Magnotta
patent: 4116695 (1978-09-01), Mori et al.
"Hard Anodizing", Surface Treatment of Al, by Wernick et al, 1964, pp. 404-405, 415-416.

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