Coating solution for metal surfaces

Details Coating solution for metal surfaces Coating solution for metal surfaces

1979-12-26

1981-06-16

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 614R, 148 315, C23F 706

Patent

active

042735920

ABSTRACT:
An acidic aqueous coating solution for forming a coating on an aluminum surface which is corrosion resistant and to which overlying coatings adhere excellently. The coating solution contains a zirconium and/or hafnium compound, a fluoride compound, and a polyhydroxy compound having no more than 7 carbon atoms. The coating solution is capable of forming on an aluminum surface a uniformly colorless and clear coating so that the coated surface has the appearance of the underlying metal surface, that is, the coating can be formed without changing the appearance of the metal surface. When coating a bright shiny aluminum surface, there can be produced a coated surface having a uniformly bright shiny appearance which is maintained even after the coated surface is subjected to boiling water. Such surface is capable of undergoing the "muffle test" to confirm the presence of the clear and colorless coating.

REFERENCES:
patent: 1710743 (1929-04-01), Pacz
patent: 2825697 (1958-03-01), Carroll et al.
patent: 3160506 (1964-12-01), O'Connor et al.
patent: 3682713 (1972-08-01), Ries et al.
patent: 3912548 (1975-10-01), Faigen
patent: 3964936 (1976-06-01), Das
patent: 4148670 (1979-04-01), Kelley

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