Process for forming a protective coating on zinciferous metal su

Details Process for forming a protective coating on zinciferous metal su Process for forming a protective coating on zinciferous metal su

1997-07-17

1999-02-23

Simmons, David A.

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148273, 148279, C23C 2248

Patent

active

058739521

ABSTRACT:
More nearly consistent quality of the coatings formed by contacting a zinciferous surface with an aqueous liquid treatment composition comprising water, transition metal cations, and fluorometallate anions, and, optionally, acidity adjustment agents can be achieved by (I) measuring the pH value of and the concentrations of transition metal cations and of fluorometallate anions in the treatment composition as it is used, (II) removing a specified fraction of the treatment composition from contact with the remainder of the treatment composition, and (III) adding one or more suitable replenisher compositions to the treatment composition, in order to maintain the measured pH and concentration values within specified ranges.

REFERENCES:
patent: 5344504 (1994-09-01), Deck et al.

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