Zinc phosphating process and composition with reduced...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/07 (2006.01) C23C 22/18 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2390018

The phosphate concentration, and therefore the pollution potential, of conventional high quality phosphating compositions containing zinc, manganese, and, optionally, nickel or copper cations, can be reduced without loss of corrosion protective value of the phosphate coatings formed by maintaining concentrations of active ingredients within prescribed ranges. Under the most preferred conditions, the corrosion resistance of phosphated and then painted cold rolled steel and the paint adhesion to phosphated and then painted electrogalvanized steel are improved over values obtained with the now most commonly used commercial high quality low zinc phosphating processes.

La teneur en phosphate et par conséquent le potentiel de pollution des compositions classiques de phosphatation de haute qualité contenant du zinc, du manganèse, et facultativement des cations nickel ou cuivre, peut être réduite sans pour autant diminuer la valeur de la protection contre la corrosion des revêtements au phosphate du fait que l'on maintient les concentrations des ingrédients actifs dans des limites prédéfinies. Dans les conditions les plus préférées, la résistance à la corrosion de l'acier laminé phosphaté et peint ensuite à froid et l'adhérence de la peinture sur l'acier phosphaté puis zingué par électrolyse et peint sont améliorées comparativement aux valeurs obtenues avec les procédés de phosphatation de zinc de haute qualité qui sont actuellement les plus couramment utilisés au niveau industriel.

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