Low sludging composition and process for treating aluminum...

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 22/10 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2208459

A highly corrosion-resistant, strongly paint-adherent conversion coating is formed on the surface of aluminiferous metal substrates by contacting such surfaces for 0.5 to 60 seconds with a sludging-free water-based surface treatment bath that has a pH of 1.5 to 4.0 and contains a zirconium compound, phosphoric acid compound, oxidizing agent, and a compound that is a source of hydrogen fluoride (in a quantity that produces a concentration of from 0.0001 to 0.2 g/L HF in the treatment bath). This contact is preferably followed by a water rinse and drying.

On réalise une couche de conversion extrêmement résistante à la corrosion et présentant d'excellentes caractéristiques d'adhérence pour la peinture sur la surface de substrats en métaux alumineux par mise en contact desdites surfaces pendant 0,5 à 60 secondes avec un bain de traitement de surface à base aqueuse, résistant à la formation d'un précipité solide, possédant un pH de 1,5 à 4 et contenant un composé de zirconium, un composé d'acide phosphorique, un agent oxydant et un composé source de fluorure d'hydrogène (en quantité permettant d'obtenir une concentration de 0,0001 à 0,2 g/L HF dans le bain de traitement). Cette opération est, de préférence, suivie par un rinçage à l'eau et par un séchage.

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