Surface treatment agent for zinciferous-plated steel
AssigneeHenkel Corporation
InventorsMasayuki Aoyama, Takao Ogino
Life of this patent
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Abstract
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).sub.m R.sub.n SiX.sub.(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 %.
Claims14
An aqueous liquid surface treatment composition for zinciferous-plated steel, said composition comprising water and:
- (A) a component selected from the group consisting of polyhydroxyaryl carboxylic acids and depsides of polyhydroxyaryl carboxylic acids;
- (B) a component selected from the group consisting of silanes conforming to the general formula (I):
- (YR).sub.m R.sub.n SiX.sub.(4-m-n), (I)
- in which R denotes an alkyl group, which may be the same or different from one of the m YR and the n R moieties to another;
- X denotes a methoxy or ethoxy moiety;
- Y denotes a moiety selected from the group consisting of vinyl, amino, mercapto, and glycidoxy, and methacryloxy moieties, which may be the same or different from one of the m YR moieties to another, m is an integer with a value from 1 to 3;
- and n is an integer with a value of 0 to (3-m);
- and
- (C) from 1 to 30% by weight of a component selected from water-miscible monoalcohols.
Dependencies are inferred from the claim text.