Method for replenishing chemical in zinc phosphate treatment

Metal treatment – Compositions – Heat treating

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C23F 710

Patent

active

044432739

ABSTRACT:
A method for replenishing a nitrite accelerated zinc phosphate treating liquid for forming zinc phosphate coatings on metal surfaces, wherein the metal surface is treated at the rate of 3 to 15 m.sup.2 per hour per cubic meter of treating liquid and the treating liquid is replenished with free phosphoric acid at the rate of 0.10 to 0.31 moles per 10 m.sup.2 of treated surface area.

REFERENCES:
patent: 2316811 (1943-04-01), Romig
patent: 3294593 (1966-12-01), Wyszomiriski
patent: 3401065 (1968-09-01), Steinbrecher
patent: 4071379 (1978-01-01), Cooke et al.
patent: 4287004 (1981-09-01), Murakami et al.

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