Chromium-free conversion coating treatment of aluminum

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 22/78 (2006.01) C23C 22/34 (2006.01) C23C 22/73 (2006.01)

Patent

CA 2163621

The invention concerns a method of pretreating aluminum or aluminum alloy surfaces before application of a permanent corrosion-protective conversion coating treatment, in particular before phosphating in acidic phosphating baths containing zinc, a chromating treatment, or a chromate free treatment. The method is characterized in that the surfaces are brought into contact with acidic aqueous treatment solutions containing complex fluorides of the elements boron, silicon, titanium, zirconium, or hafnium, alone or in mixtures with each other, at total concentrations between 100 and 4000 mg/L and at a pH between 0.3 and 3.5. Following the pretreatment, the aluminum or aluminum alloy parts may, after shaping if necessary, be joined by adhesive bonding and/or welding to each other or to parts made of steel, zinc plated and/or zinc alloy plated steel, and/or aluminum or aluminum alloy plated steel.

Procédé de traitement préalable de surfaces en aluminium ou en alliage d'aluminium avant un traitement de revêtement par conversion assurant une protection permanente contre la corrosion, en particulier une phosphatation avec des bains de phosphatation contenant du zinc, une chromatation ou un traitement de revêtement par conversion sans chrome, procédé caractérisé en ce que les surfaces sont mises en contact avec des solutions de traitement aqueuses et acides, qui comprennent des fluorures complexes des éléments bore, silicium, titane, zirconium ou hafnium, isolés ou en mélange, avec des concentrations totales comprises entre 100 et 4000 mg/l et un pH compris entre 0,3 et 3,5. Après le traitement préalable, les pièces en aluminium ou en alliage d'aluminium, éventuellement après un formage, peuvent être assemblées, par collage et/ou par soudage, entre elles ou avec des pièces en acier et/ou en acier zingué et/ou recouvert d'alliage de zinc et/ou en acier aluminé et/ou recouvert d'un alliage d'aluminium.

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