Surface treatment agent for galvanized steel sheets,...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 22/05 (2006.01) B05D 3/10 (2006.01) C09D 5/08 (2006.01)

Patent

CA 2748285

Disclosed is a surface treatment agent for galvanized steel sheets, which comprises epoxy-containing silane derivates, alkyl-containing silane derivates, alkoxy silane derivates and one or more selected from the group consisting of a cationic polymer aqueous dispersion, a non-ionic polymer aqueous dispersion and a water-soluble polymer. Also disclosed is a method for producing it, which comprises mixing each component uniformly for 0.5 to 8 hours at 5 to 70~. Further provided are galvanized steel sheets coated with the surface treatment agent on the surface and a production method thereof. The surface treatment agent for galvanized steel sheets has excellent corrosion resistance, alkali resistance, solvent resistance, recoating property, high temperature resistance and electrical conductivity.

La présente invention concerne un agent de traitement de surface pour tôle en acier galvanisé qui comprend des dérivés de silane contenant des groupes époxyde, des dérivés de silane contenant des groupes alkyle, des dérivés d'alcoxysilane et un ou plusieurs composants choisis parmi une dispersion aqueuse de polymère cationique, une dispersion aqueuse de polymère non ionique et un polymère hydrosoluble. L'invention concerne également un procédé de fabrication de cet agent de traitement de surface qui consiste à mélanger uniformément chaque composant pendant 0,5 à 8 heures entre 5 et 70 °C. L'invention concerne en outre des tôles en acier galvanisé recouvertes par l'agent de traitement de surface, et un procédé de fabrication de ces tôles. L'agent de traitement de surface présente d'excellentes propriétés en termes de résistance à la corrosion, résistance aux alcalins, résistance aux solvants, recouvrement, résistance à haute température et conductivité électrique.

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