Phosphating method with control in response to conductivity chan

Details Phosphating method with control in response to conductivity chan Phosphating method with control in response to conductivity chan

1976-04-19

1978-05-16

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 615R, C23F 710

Patent

active

040897109

ABSTRACT:
A method of controlling a continuous process of phosphating metal surfaces in which an acidic zinc phosphate solution is brought to the steady state and there maintained in response to conductivity change, as phosphating proceeds, by addition of replenishments (a) acidic zinc phosphate and (b) alkali metal ion in a definite ratio of addition rates.

REFERENCES:
patent: 3312189 (1967-04-01), McVey
patent: 3338755 (1967-08-01), Jenkins et al.
patent: 3369928 (1968-02-01), Arlow
patent: 3525651 (1970-08-01), Smith et al.
patent: 3607453 (1971-09-01), Engesser et al.
patent: 3758349 (1973-09-01), Engesser
patent: 3758349 (1973-09-01), Engesser

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