Coating solution for metal surfaces

Details Coating solution for metal surfaces Coating solution for metal surfaces

C - Chemistry, Metallurgy

23

C

148/23

C23C 22/34 (2006.01)

Patent

CA 1174945

ABSTRACT OF THE DISCLOSURE An acidic aqueous coating solution which contains a metal selected from the group consisting of zirconium, titanium, hafnium, and mixtures thereof, fluoride, and one or more of the following organic compounds: a surfactant or a poly- hydroxy compound having no more than 7 carbon atoms, or a mixture of said surfactant and said polyhydroxy compound, said solution being free of phosphate and boron when the organic compound is the polyhydroxy compound, and which solution is effective in forming on an aluminum surface a non-chromate, clear and colorless, corrosion resistant coating to which overlying siccative coatings adhere tightly.

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