Pretreatment compositions and methods for coating a metal...

Details Pretreatment compositions and methods for coating a metal... Pretreatment compositions and methods for coating a metal...

C - Chemistry, Metallurgy

23

C

C23C 22/34 (2006.01) B05D 7/14 (2006.01) C09D 5/08 (2006.01) C23C 22/36 (2006.01) C23C 22/44 (2006.01) C23C 22/73 (2006.01) C23C 22/80 (2006.01) C23C 22/83 (2006.01)

Patent

CA 2694515

Disclosed are methods for treating metal substrates, including ferrous substrates, such as cold rolled steel and elec-trogalvanized steel. The methods include contacting the substrate with a pretreatment composition that includes: (a) a group UIB and/or IVB metal an electropositve metal (c) free fluorine; (d) a metal fluoride salt formed from a metal which forms a fluoride salt having a pK sP of at least 11; and (e) water.

L'invention concerne des procédés servant à traiter des substrats métalliques, dont des substrats ferreux, tels que l'acier laminé à froid et l'acier galvanisé par électrolyse. Les procédés consistent à mettre en contact le substrat avec une composition de prétraitement qui comprend : (a) un métal du groupe IIIB et/ou IVB; (b) du fluor libre; (c) un sel de type fluorure de métal formé à partir d'un métal qui forme un sel de fluorure ayant un pKsp d'au moins 11; et (d) de l'eau.

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