Method for preventing leaching of contaminants from solid surfac

Details Method for preventing leaching of contaminants from solid surfac Method for preventing leaching of contaminants from solid surfac

1979-12-06

1983-05-24

Smith, John D.

Coating processes

With post-treatment of coating or coating material

Heating or drying

427 82, 427 95, 4273977, B05D 302

Patent

active

043850863

ABSTRACT:
An efficient method is proposed for preventing leaching of contaminants from the surface of a solid, such as sodium ions from the surface of soda glass or nickel, chromium or iron from the surface of stainless steel in order to minimize detrimental contamination of highly pure substances in contact with the solid surface.
The effect is basically obtained by providing a coating film of oxidized silicon on to the solid surface and the coating film is formed by applying a coating solution containing a hydroxysilane compound to the surface followed by baking of the coating layer at a temperature not lower than 150.degree. C., the coating solution being prepared by the equilibration reaction of an alkoxysilane with a carboxylic acid and an alcohol, of an acyloxysilane with an alcohol, or of an alkoxysilane with water in an alcohol where the molar ratios of the individual reactants are in the specified ranges.

REFERENCES:
patent: 3556841 (1971-01-01), Iwasa et al.
patent: 3925583 (1975-12-01), Rau et al.
patent: 3927697 (1975-12-01), Baumler et al.
patent: 4041190 (1977-08-01), Dubois et al.
patent: 4107388 (1978-08-01), Gambaretto
patent: 4277525 (1981-07-01), Nakayama et al.

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