Surface treatment agent for zinciferous-plated steel

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 22/05 (2006.01) B05D 7/16 (2006.01) C23C 22/34 (2006.01) C23C 22/53 (2006.01) C23C 22/68 (2006.01)

Patent

CA 2182395

A chromium-free aqueous liquid surface treatment agent that can impart both a good corrosion resistance and a good paint adherence to zinciferous-plated steel sheet contains as its essential components polyhydroxyaryl carboxylic acid and/or depside thereof and silane coupling agent with the formula (YR)mRnSiX(4-m-n), in which R denotes alkyl groups; X is the methoxy or ethoxy group; Y is the vinyl, amino, mercapto, glycidoxy, or methacryloxy group; m = 1 to 3; and n = 0 to (3-m). The total content of said essential components is preferably 1 to 50 weight %.

Un agent de traitement de surface liquide aqueux et dépourvu de chrome pouvant conférer une bonne résistance à la corrosion et une bonne adhérence de la peinture à une feuille d'acier zingué est constitué principalement d'acide carboxylique polyhydroxyaryle et/ou d'un depside de ce dernier, et d'un agent de couplage au silane correspondant à la formule (YR)¿m?R¿n?SiX¿(4-m-n)? dans laquelle R représente des groupes alkyle; X représente le groupe méthoxy ou éthoxy; Y représente le groupe vinyle, amino, mercapto, glycidoxy ou méthacryloxy; m représente un entier compris entre 1 et 3; et n représente un entier compris entre 0 et (3-m). Le volume total de ces constituants principaux est, de préférence, de 1 à 50 pour cent en poids.

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