Rustproofing agent for zinc plated steel sheet

Details Rustproofing agent for zinc plated steel sheet Rustproofing agent for zinc plated steel sheet

C - Chemistry, Metallurgy

23

C

C23C 22/05 (2006.01) C23C 22/53 (2006.01) C23C 22/74 (2006.01) C23F 11/00 (2006.01)

Patent

CA 2437200

A rustproofing agent for a zinc plated steel sheet is provided which contains (A) a chromium aqueous solution containing an organic substance and (B) an acid metal such as a metal salt of nitric acid or phosphoric acid. All of the chromium in the chromium aqueous solution of component. A is trivalent chromium. It is preferable if the organic substance in component A contains at least one type of oxy acid or oxide thereof. The metal in the acid metal salt of component B is an alkaline earth metal, cobalt, nickel, iron, zirconium, titanium, etc. It is also preferable if (C) a water-dispersible silica is contained as an additional component. The present invention also provides a zinc plated steel sheet, in which at least one side of the surface of a zinc plated steel sheet is coated with the zinc plated steel sheet rustproofing agent and the rustproofing agent dried to form a coating with a dry coating weight of 0.01 to 3 g/m2.

L'invention concerne un agent anticorrosion pour tôle d'acier zinguée contenant (A) une solution aqueuse de chrome renfermant une substance organique et (B) un sel métallique d'acide tel qu'un sel métallique d'acide nitrique ou d'acide phosphorique. Tout le chrome de la solution aqueuse de chrome du composant A est trivalent. Il est préférable que la substance organique contenue dans le composant A renferme au moins un type d'oxyacide ou d'oxyde de celle-ci. Le métal contenu dans le sel métallique d'acide du composant B est un métal alcalino-terreux, du cobalt, du nickel, du fer, du zirconium, du titane, etc.. Il est également préférable que (C) une silice dispersable dans l'eau soit contenue dans l'agent anticorrosion comme composant supplémentaire. Cette invention concerne enfin une tôle d'acier zinguée, dans laquelle au moins un côté de la surface est revêtue d'agent anticorrosion pour tôle d'acier zinguée et l'agent anticorrosion séché en vue de former un revêtement à poids de revêtement sec compris entre 0,01 to 3 g/m?2¿.

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