Conversion coatings including alkaline earth metal fluoride...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/34 (2006.01) C23C 22/73 (2006.01) C23C 22/83 (2006.01)

Patent

CA 2484103

An aqueous composition for pretreating and depositing a coating on metal substrates is provided. The coating composition includes from about 1,500 to about 55,000 ppm based on the aqueous composition of a Group IIA dissolved metal ion, from about 100 to about 200,000 ppm based on the aqueous composition of a dissolved complex metal fluoride ion wherein the metal atom is selected from Group IIIA, Group IVA, Group IVB metals, Group VA, Group VB metals; and water. The composition is free of Group IIA metal fluoride precipitate achieved by including in the composition a complex metal salt different than the salt associated with the complex metal fluoride ion, with the complex metal salt being capable of complexing free fluoride ions to prevent a precipitation reaction. A process for coating a metal substrate with such an aqueous composition is further provided.

L'invention concerne une composition aqueuse permettant de prétraiter des substrats métalliques et de déposer un revêtement sur ces derniers. Cette composition de revêtement contient approximativement de 1 500 à 55 000 ppm par rapport à la composition aqueuse, d'un ion métallique dissous du groupe IIA, et approximativement 100 à 200 000 ppm, par rapport à la composition aqueuse, d'un ion complexe de fluorure métallique, l'atome de métal étant choisi parmi les métaux du groupe IIIA, du groupe IVA, du groupe IVB, du groupe VA, et du groupe VB, et de l'eau. Cette composition est exempte de précipités de fluorure de métaux du groupe IIA, grâce à l'inclusion dans la composition d'un complexe de sel métallique différent du sel associé au complexe ionique de fluorure métallique, le complexe de sel métallique étant capable de former un complexe avec les ions fluorure libres afin d'empêcher une réaction de précipitation. L'invention concerne également un procédé permettant de former un revêtement sur un substrat métallique avec une telle composition aqueuse.

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