Twice-anodized aluminum article having an organo-phosphorus mono

Details Twice-anodized aluminum article having an organo-phosphorus mono Twice-anodized aluminum article having an organo-phosphorus mono

1992-05-22

1994-01-11

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Forming multiple superposed electrolytic coatings

205172, 205332, C25D 1112

Patent

active

052777880

ABSTRACT:
A twice-anodized aluminum substrate is anodized sequentially in first and second aqueous electrolytes. In the first, the substrate is conventionally anodized to produce (i) a porous anodic oxide layer having open pores and a passivation layer thereunder. The substrate, now singly-coated, is then anodized in the second electrolyte of an aqueous solution of an organophosphorus compound which generates a residue which is chemisorbed and covalently bonded to the substrate to form (ii) a monomolecular essentially continuous monolayer on the outer surface of (i), and at the same time, the second anodizing step produces (iii) a barrier layer of non-porous aluminum oxide under (i). The thickness of this barrier layer can be increased as a function of the voltage used while maintaining the thickness of (i) substantially constant, and (ii) protects (i) from dissolution. Depending upon the choice of the organophosphorus compound, a hydrophobic, or chemically resistant surface may be produced; or, a surface which provides a leaving group to be reacted with an appropriate organic coating to be applied after the triplex layer is formed.

REFERENCES:
patent: 4153461 (1979-05-01), Berghauser et al.
patent: 4448647 (1984-05-01), Gillich et al.
patent: 4554057 (1985-11-01), Mohr
patent: 5032237 (1991-07-01), Wieserman et al.

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