Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1989-11-28
1991-08-13
Woo, Jay H.
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
148259, 148262, 134 13, C23C 2277
Patent
active
050393618
ABSTRACT:
During a method of phosphating a metal surface which includes at least in part iron or steel and is dipped into or flooded with a phosphating solution which contains layer-forming cations and nitrate or equivalent accelerators, the iron content is limited by a precipitation of iron phosphate. A partial volume of the phosphating solution is intermittently withdrawn from the bath tank and in a separate aerator is contacted with oxygen or an oxygen-containing gas. The iron phosphate sludge is removed from the resulting solution, which is then returned to the bath tank. The partial volume of the phosphating solution is supplied from below into and is aerated in an aerator, which is provided with an aspirating aerating agitator and which is tapered at least in its lower portion. When the aerator has been terminated, the phosphating solution which has been depleted of iron(II) is sucked off upwardly and is returned to the bath tank.
REFERENCES:
patent: 3874951 (1975-04-01), Hill
patent: 3992300 (1976-11-01), Hill
Hauffe Dieter
Hieke Jorg
Oei Han-Yong
Siemund Gunter
Vey Rudolf
Durkin II Jeremiah F.
Metallgesellschaft Aktiengesellschaft
Woo Jay H.
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