| 摘要 |
PCT No. PCT/US95/00977 Sec. 371 Date Aug. 2, 1996 Sec. 102(e) Date Aug. 2, 1996 PCT Filed Feb. 1, 1995 PCT Pub. No. WO95/21277 PCT Pub. Date Aug. 10, 1995A 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 %.
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