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

1992-06-15

1993-11-02

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C23C 2208

Patent

active

052580784

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: 3307979 (1967-03-01), Upham
patent: 4474626 (1984-10-01), 052577392

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