Patent ID: 6464800
Filing Date: 2002-10-15
Classification: C23C

Abstract:
An aqueous liquid composition of matter for producing a readily visible conversion coating on a metal surface by spontaneous chemical reaction therewith, without requiring any imposition of external electromotive force, said composition comprising water and:(A) a product of chemical interaction between: (A.1) an amount, all of which is dissolved in the water, of a first initial reagent component selected from the group consisting of fluoroacids of the elements titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin; and (A.2) an amount, which may be dissolved, dispersed, or both dissolved and dispersed in the water, of a second initial reagent component selected from the group consisting of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin and all of oxides, hydroxides, and carbonates of all of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin; â€ƒand (B) an amount, sufficient to impart a color to the composition, of a component selected from the group consisting of alizarine dyes.