Chromium-free corrosion protection agent and method for...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 22/34 (2006.01) C23C 22/36 (2006.01) C23C 22/40 (2006.01)

Patent

CA 2312807

The invention relates to a chromium-free aqueous corrosion protection agent for treating galvanised or alloy galvanised steel surfaces or aluminium surfaces. Said agent contains the following essential constituents: a) 0.5 to 10 g/l hexafluoro-anions of titanium (IV) and/or zircon (IV), b) 5 to 15 g/l vanadium ions, c) 0.5 to 2 g/l transition metal ions, preferably Mn, Fe, Co, d) 30 to 150 g/l phosphoric acid and/or phosphonic acid. The inventive corrosion protection agent preferably also contains an organic film former, especially with a polyacrylate base; and a conductivity pigment. The agent is particularly suitable for treating metal strips in order to protect them against corrosion, with or without subsequent painting, and is preferably applied in such a way as to produce a dry layer coating of 0.5 to 5 g/m2 on the surface.

L'invention concerne un agent anticorrosion aqueux exempt de chrome s'utilisant pour traiter des surfaces en acier galvanisé ou galvanisé par alliage, ainsi qu'en aluminium. Cet agent contient comme principaux constituants: a) entre 0,5 et 10 g/l d'hexafluoro-anions de titane (IV) et/ou de zircon (IV), b) entre 5 et 15 g/l d'ions de vanadium, c) entre 0,5 et 2 g/l d'ions de métal de transition, de préférence Mn, Fe, Co, d) entre 30 et 150 g/l d'acide phosphorique et/ou d'acide phosphonique. Cet agent anticorrosion contient de préférence en outre un agent filmogène organique, notamment à base de polyacrylate. L'agent anticorrosion contient de plus de préférence un pigment de conductivité. Cet agent anticorrosion s'utilise notamment pour appliquer des traitements anticorrosion à de feuillards, avec ou sans laquage subséquent, et est appliqué de préférence de manière à obtenir sur la surface un revêtement à couche sèche comprise entre 0,5 et 5 g/m?2¿.

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