Metal treatment – Compositions – Heat treating
Patent
1981-12-21
1984-04-17
Silverberg, Sam
Metal treatment
Compositions
Heat treating
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.
Mino Yasutake
Murakami Ryoichi
Nakatani Nobuo
Saito Koichi
Millson Jr. Henry E.
Silverberg Sam
Szoke Ernest G.
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