No rinse zinc phosphate treatment for prepaint application

Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...

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148262, C23C 2200

Patent

active

061172510

ABSTRACT:
An aqueous solution and method for applying the solution to a metal surface form a zinc phosphate coating on the metal surface. The zinc phosphate coating minimizes corrosion and improves adhesion of subsequently coated materials such as sealants and paints. The solution of the composition and method of application consume free acidity otherwise left on the metal surface, and obviate the need for subsequent rinsing or extensive drying or stoving operations. The composition includes an aqueous solution including water, zinc dihydrogen phosphate, phosphoric acid, a polyhydric polymer, a metal salt, and optionally, a fluoride.

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T. Sugama et al. "Use of Polyacrylic Acid Electrolytes Diffused in Zinc Phosphate Conversion Coatings For the Corrosion Protection of Steel," Journal of Coatings Tech., vol. 61, No. 771, pp. 43-57 (1989).
Kunde et al. "Performance Evaluation of Prephosphated Galvannealed Steel Sheet for Automotive Applications," SAE Technical Paper Series 970152, pp. 21-26 (1997).
Lautensleger et al. "Formability Performance of Prephosphated Galvannealed Sheet Steel," SAE Technical Paper Series 970717, pp. 147-158 (1997).

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