Process for phosphating metal surface to make thereon a zinc...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/36 (2006.01) C23C 22/73 (2006.01) C23C 22/76 (2006.01)

Patent

CA 2040813

A metal surface is processed with dipping by a first zinc phosphating solution in which a fluoride complex and a simple fluoride are contained and a concentration of this simple fluoride is 200 to 300 mg/l on a basis converted into the HF concentration and that of the fluoride complex is in a mole ratio with the simple fluoride converted into the HF as shown as, [fluoride complex] / [simple fluoride] ~ 0.01, and then the surface is processed with spraying by a second zinc phosphating solution in which a simple fluoride concentration is 500 mg/l or less and higher than that in said first zinc phosphating solution. Thus, on a metal surface is formed a zinc phosphate coating film which is suitable for electrodeposition coating, particular for cationic electrodeposition coating, and superior in coating film adhesion, corrosion-resistance, particularly resistance for warm brine, and prevention of scab-corrosion.

Une surface métallique est traitée par immersion dans une première solution de phosphatation au zinc renfermant un complexe de fluorure et un fluorure simple; la concentration du fluorure simple est de 200 à 300 mg/l, selon une base de conversion en concentration de HF, et la concentration du complexe de fluorure se situe dans un rapport molaire avec le fluorure simple converti en HF, tel qu'illustré, soit ¢fluorure complexe!/¢fluorure simple! ~ 0.01; la surface est ensuite traitée par pulvérisation avec une seconde solution de phosphatation au zinc, dans laquelle la concentration de fluorure simple est de 500 mg/l ou moins, mais supérieure à celle de la première solution de phosphatation au zinc. Ainsi, il se forme sur une surface métallique une pellicule de phosphate de zinc, qui convient aux revêtements par électrodéposition, notamment aux revêtements par électrodéposition cationique; ce type de revêtement est supérieur du point de vue de l'adhérence de la pellicule, de la résistance à la corrosion, de la résistance spécifique à la saumure à haute température, et de la prévention de la corrosion mesurée par le « scab test ».

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