Zinc phosphate conversion coating and process

Details Zinc phosphate conversion coating and process Zinc phosphate conversion coating and process

1998-11-10

2000-02-01

Willis, Prince

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148261, 148262, C23C 2207

Patent

active

060198583

ABSTRACT:
Concentrates containing (a) an hydroxylamine sulfate accelerator, and (b) zinc, nickel, manganese, and phosphate ions are formulated into aqueous coating solutions for treating metal surfaces, such as ferrous, zinc, and aluminum surfaces. In the process of using this solution, hydroxylamine ions become depleted or reduced in concentration in the applied solution. A replenishing solution is added for reusing the solution until the replenished coating solution reaches a sulfate level of no more than 14 g/l.

REFERENCES:
patent: 4865653 (1989-09-01), Kramer
patent: 5238506 (1993-08-01), Cape et al.

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