Composition and process for forming an underpaint coating on...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/16 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2214654

A zinc phosphating composition containing organoperoxide along with zinc ions and phosphate ions forms finely crystalline, dense, and thin conversion coatings on metal surfaces that are normally zinc phosphate conversion coated, even at coating temperatures below 50 ~C and without any "conditioning" of the surface before conversion coating by contact of the surface to be conversion coated with a conventional colloidal suspension of titanium salts.

Cette invention concerne une composition pour revêtement de conversion en phosphate de zinc, ladite composition contenant de l'organoperoxyde associé à des ions zinc et des ions phosphate. Cette composition permet d'obtenir des revêtements de conversion de faible épaisseur, denses et à structure cristalline fine à la surface de métaux sur lesquels on dépose normalement un revêtement de conversion en phosphate de zinc, même à des températures permettant la formation d'un revêtement, inférieures à 50 ·C et sans aucun "conditionnement" de la surface avant le dépôt du revêtement de conversion par mise en contact de ladite surface à garnir du revêtement de conversion avec une suspension colloïdale classique de sels de titane.

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