Anti-corrosion method and treatment for a metal substrate...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/53 (2006.01) C23C 22/08 (2006.01) C23C 22/68 (2006.01)

Patent

CA 2380304

The invention concerns an aqueous composition for an anti-corrosion treatment of a metal substrate pretreated with a zinc-based protective coating layer. The invention is characterised in that it is in the form of an aqueous silane-based solution containing: 72 to 95 wt. % of water, 0.5 to 10 wt. % of a silane, 0.5 to 3 wt. % of boric acid, 0 to 3 wt. % of phosphoric acid, 1 to 10 wt. % of miconized silica, and 0.1 to 3 wt. % of a wetting agent provided that the total sum of boric acid and phosphoric acid percentages does not exceed about 5 %.

La présente invention concerne une composition aqueuse de traitement anti- corrosion d'un substrat métallique préalablement protégé par une couche de revêtement à base de zinc, caractérisée en ce qu'elle se présente sous la forme d'une solution aqueuse à base de silane contenant: de 72 à 95 % en poids d'eau, de 0,5 à 10 % en poids d'un silane, de 0,5 à 3 % en poids d'acide borique, de 0 à 3 % en poids d'acide phosphorique, de 1 à 10 % en poids d'une silice micronisée, et de 0,1 à 3 % en poids d'un agent mouillant à la condition que la somme des pourcentages d'acide borique et d'acide phosphorique n'excède pas environ 5 %.

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