Composition and process for surface treatment of aluminum...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/08 (2006.01) C23C 22/23 (2006.01)

Patent

CA 2232998

An aqueous liquid surface treatment composition having a pH value not more than 6.5 and containing phosphoric acid ions, condensed phosphoric acid ions, an oxidizing agent, and a water-soluble polymer consisting, except for end groups, of polymer units expressed by formula (I), in a weight ratio of 0.1 to 30 : 0.1 to 10 : 0.1 to 10 : 0.1 to 20 respectively, when brought into contact with an aluminiferous metal surface, rapidly forms on the surface a conversion coating that has good corrosion resistance and adhesion to subsequently applied organic coatings such as paint and is less easily damaged by mechanical stresses than prior art conversion coatings.

L'invention concerne une composition liquide aqueuse de traitement de surface ayant une valeur de pH n'excédant 6,5 et contenant des ions d'acide phosphorique, des ions d'acide phosphorique condensé, un agent d'oxydation et un polymère hydrosoluble consistant, à l'exception des groupes d'extrémité, d'unités polymères exprimées par la formule (I), dans un rapport pondéral allant de 0,1 à 30: 0,1 à 10: 0,1 à 10: 0,1 à 20 respectivement, lorsqu'elle est amenée au contact d'une surface métallique contenant de l'aluminium, pour former rapidement sur la surface un revêtement de conversion qui possède une bonne résistance à la corrosion et favorise l'adhésion de revêtements organiques appliqués ultérieurement tels que de la peinture, le revêtement s'endommangeant moins facilement par les contraintes mécaniques que les revêtements de conversion de l'art antérieur.

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