C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/17
C23C 22/07 (2006.01) C23C 22/00 (2006.01) C23C 22/73 (2006.01) C23C 22/86 (2006.01)
Patent
CA 2003270
During a phosphating of metal surfaces which consist at least in part of iron or steel and are dipped into or flooded with phosphating solutions which contain 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 whithdrawn from the bath tank and in a separate earator is contacted with oxygen or 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.
Pendant la phosphatation de surfaces métalliques, constituées au moins en partie de fer ou d'acier, et plongées dans des solutions de phosphatation ou recouvertes de ces dernières contenant des cations formant des couches et des accélérateurs au nitrate ou équivalents, la teneur en fer est limitée par la précipitation du phosphate de fer. On retire de temps en temps une partie de la solution de phosphatation du bain et on la met en contact avec de l'oxygène ou un gaz contenant de l'oxygène dans un aérateur séparé. La boue de phosphate de fer est éliminée de la solution obtenue, qui est ensuite renvoyée dans le bain. Le volume partiel de solution de phosphatation est prélevé au bas du bain, et celle-ci est aérée dans un aérateur muni d'un agitateur aérant, aspirant et effilé au moins dans sa partie inférieure. Quand l'aération est terminée, la solution de phosphatation, dont la teneur en fer (II) a été abaissée, est aspirée vers le haut et renvoyée dans le bain.
Hauffe Dieter
Hieke Jorg
Oei Han-Yong
Siemund Gunter
Vey Rudolf
Chemetall Gmbh
Metallgesellschaft Aktiengesellschaft
Robic
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