Method of preparing titanium-containing phosphate conditioner for metal surfaces

Abstract

The present invention relates to an improved method of preparing titanium-containing phosphate conditioners useful in cleaning and activating the surface of ferrous, zinc or aluminum metal and alloys thereof for subsequent reaction with phosphate coating solutions. The method comprises the steps of (a) preparing a mixture consisting essentially of water, sodium tripolyphosphate, disodium phosphate and a titanium-containing compound and (b) adding said mixture to solid disodium phosphate with mixing whereby a solid titanium phosphate composition is obtained. The invention provides a method for forming a dry activating composition which does not require the application of any energy such as heat to the material. When the solid titanium phosphate compound is dissolved in water to form pretreatment solutions it can be employed successfully for activating metal surfaces in preparation for reaction with phosphate coating solutions.

Dependencies are inferred from the claim text.