Zinc phosphate conversion coating compositions and process

C - Chemistry – Metallurgy – 23 – C

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C23C 22/36 (2006.01) C23C 22/13 (2006.01)

Patent

CA 2234819

A process for forming a zinc phosphate coating on an aluminum substrate is provided to obtain good coverage by the coating. The coating preferably has a columnar or nodular crystal morphology and a coating weight of at least about 1612 mg/m2. The aluminum substrate is contacted with a zinc phosphate conversion coating bath which contains: from about 0.4 to 2.5 g/l zinc ion; from about 5 to 26 g/l phosphate ion; from about 0.4 to 1.5 g/l fluoride ion; from about 4 to 400 mg/l ferrous ion; and from about 0.01 to 2 g/l ammonium ion. The zinc phosphate conversion coating is formable on an aluminum substrate in the presence or absence of an accelerator. Also provided is an aqueous zinc phosphate conversion coating concentrate which may be diluted with an aqueous medium in a weight ratio of about 1:10 to 1:100 to yield a zinc phosphate conversion coating bath.

L'invention porte sur un procédé permettant de produire un revêtement de conversion en phosphate de zinc sur un substrat d'aluminium afin d'obtenir une bonne couverture de revêtement. Ce dernier, qui possède, de préférence, une morphologie cristalline colonnaire ou nodulaire, a un poids de couche d'au moins 1612 mg/m?2¿ environ. On met en contact le substrat d'aluminium avec un bain de revêtement de conversion en phosphate de zinc contenant de 0,4 à 2,5 g/l environ d'ion zinc, de 5 à 26 g/l environ d'ion phosphate, de 0,4 à 1,5 g/l environ d'ion fluorure, de 4 à 400 g/l environ d'ion ferreux et de 0,01 à 2 g/l environ d'ion ammonium. Il est possible de former le revêtement de conversion en phosphate de zinc sur un substrat d'aluminium en présence d'un accélérateur ou en l'absence de celui-ci. L'invention porte également sur un concentré aqueux de revêtement de conversion en phosphate de zinc susceptible de dilution dans un milieu aqueux selon un pourcentage pondéral d'environ 1/10 à 1/100 et ce, afin d'obtenir un bain de revêtement de conversion en phosphate de zinc.

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