Porous anodic aluminium oxide films

Details Porous anodic aluminium oxide films Porous anodic aluminium oxide films

C - Chemistry, Metallurgy

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B

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C25B 11/04 (2006.01) B01D 39/20 (2006.01) B01D 71/02 (2006.01) C25B 11/08 (2006.01) C25D 11/04 (2006.01) C25D 11/08 (2006.01)

Patent

CA 1309374

ABSTRACT POROUS ANODIC ALUMINIUM OXIDE FILMS The invention provides porous anodic aluminium oxide film having a major face with an area of at least 50 cm2, the film material containing phosphorus derived from the anodizing electrolyte, preferably at least 5 microns thick and preferably having pores spaced 0.1 - 0.5 microns apart. The film may be made by anodizing one or more aluminium metal anodes of suitable area in an electrolyte based on phosphoric acid at a concentration of 5-150 g/l maintained at a temperature in the range 5-50°C using an anodizing voltage of 40-200 V. After separation from the metal substrate, the films have interesting properties for use in filters.

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