Process for coating metal surfaces with a passivating agent,...

Details Process for coating metal surfaces with a passivating agent,... Process for coating metal surfaces with a passivating agent,...

C - Chemistry, Metallurgy

23

C

C23C 22/17 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2718242

The invention relates to a process for coating metallic surfaces with an aqueous composition as solution or as dispersion, wherein the composition contains at least one phosphate, at least 3 g/l of at least one titanium or/and zirconium compound and at least one complexing agent, and also corresponding aqueous compositions. The coatings produced therewith display very good bare corrosion protection in the NSS salt spray test and in the condensate water constant temperature and humidity test.

L'invention se rapporte à un procédé d'enduction de surfaces métalliques comprenant une composition aqueuse sous forme de solution ou de dispersion, ladite composition contenant au moins un phosphate, au moins 3 g/l d'au moins un composé de titane et/ou de zirconium et au moins un agent complexant ainsi que des compositions aqueuses correspondantes. Les revêtements ainsi produits sont très résistants à la corrosion sur ébauche lors de l'essai au brouillard salin neutre (NSS) et lors de l'essai d'eau condensée en climat constant.

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