Method of forming a hydrophilic coating on an aluminum surface

Details Method of forming a hydrophilic coating on an aluminum surface Method of forming a hydrophilic coating on an aluminum surface

B - Operations, Transporting

05

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117/91

B05D 3/02 (2006.01) B05D 3/10 (2006.01) B32B 15/20 (2006.01) C23C 22/83 (2006.01)

Patent

CA 1056659

METHOD OF FORMING A HYDROPHILIC COATING ON AN ALUMINUM SURFACE ABSTRACT OF THE DISCLOSURE A method of forming a hydrophilic coating on an aluminum surface comprises the steps of: a) etching the aluminum surface; b) treating the etched aluminum surface with an acidic first aqueous solution comprising from about 0.5 to about 3 g/l of active fluoride, from about 2.5 to about 60 g/l of chromate ion (calculated as CrO3) and from about 2 to about 300 g/l of phosphate ion, so as to form a coating having a weight of at least 150 mg/sq. ft.; c) treating the aluminum surface with an alkaline second solution containing an alkali metal silicate; and d) baking the treated aluminum surface. S P E C I F I C A T I O N

249052

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