Patent ID: 6193815
Filing Date: 2001-02-27
Classification: C23C

Abstract:
An aqueous liquid composition that is suitable for treating the surface of aluminiferous metals to form a corrosion protective and paint-adherent coating thereon, said composition comprising the following components in relative amounts as recited below:(A) from 0.01 to 5 parts by weight of dissolved phosphate ions;(B) from 0.1 to 2 parts by weight, calculated as their stoichiometric equivalent as titanium atoms, of dissolved molecules, ions, or both that contain titanium atoms;(C) from 0.05 to 5 parts by weight, calculated as their stoichiometric equivalent as fluorine atoms, of dissolved molecules, anions, or both that contain fluorine atoms; and(D) from 0.01 to 2 parts by weight of water soluble accelerator that is a combination of (a) sodium nitrite and potassium permanganate or (b) nitric acid and ammonium heptamolybdate.