Method and composition for depositing heavy iron phosphate coati

Details Method and composition for depositing heavy iron phosphate coati Method and composition for depositing heavy iron phosphate coati

1990-02-09

1992-08-11

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148260, C23C 2208

Patent

active

051375893

ABSTRACT:
An immersion bath composition and a method for applying a heavy, non-powdery coating of iron phosphate on a ferrous substance which is characterized by the addition of an effective amount of gluconic acid to a solution containing phosphoric acid, a soda ash, a chlorate or organic accelerator and water. Using conventional phosphating bath parameters, immersion of a ferrous substrate into the bath produces a heavy, strongly adherent, iron phosphate coating which is non-powdery or dust free and highly satisfactory for paint pre-treatment of the substrate surface.

REFERENCES:
patent: 4474626 (1984-10-01), Lumaret
patent: 4670066 (1987-06-01), Schapira
patent: 4728373 (1988-03-01), Nakagawa

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