Phosphate coatings for metal surfaces

Details Phosphate coatings for metal surfaces Phosphate coatings for metal surfaces

1992-05-06

1993-08-03

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148262, 148260, C23C 2212

Patent

active

052325237

ABSTRACT:
The present inventin concerns a process for phosphating a metal surface comprising treating a metal surface with an acidic aqueous phosphate solution comprising zinc ion, phosphate ion, a phosphating accelerator and particular concentration of colloidal particles having an isoelectric point of 3 or less and an average particle diameter of 0.1.mu. or less, the metal surface being iron-based surface, zinc-based surface or combination thereof and the resulted phosphate coating being excellent in film adhesion, corrosion resistance and especially scab corrosion resistance.

REFERENCES:
patent: 4264378 (1981-04-01), Oppen

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