Protective coating for aluminum and method of making

Details Protective coating for aluminum and method of making Protective coating for aluminum and method of making

B - Operations, Transporting

32

B

117/143

B32B 15/08 (2006.01) G02B 1/10 (2006.01)

Patent

CA 1170516

ABSTRACT OF THE DISCLOSURE Composite coating on aluminum article comprising base layer formed from alkali metal silicate compound and outer layer formed of a dispersion of colloidal silica and a silicone resin is tightly adherent to the aluminum surface, provides protection from corrosion and is abrasion resistant Improved aluminum reflectors are made by suitably brightening the surface to provide a highly specular reflective surface, applying a base coating of a silicate solution on the thus treated sur- face, heating the thus applied base coating to remove the chemically bound water therefrom, rinsing the base coating to remove alkali metal ions therefrom, applying an outer coating of the colloidal-silica-silicone resin composition and drying the latter coating

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