| 摘要 |
PROBLEM TO BE SOLVED: To impart appearance and corrosion resistance equivalent to those obtained through chromate conversion treatment to a zinc-based member to be plated, by using a reactive chromium-free chemical conversion treatment which can uniformly form a rust preventive film even on a member having a complicated shape. SOLUTION: The rust preventive film is formed on a metal surface by using a liquid for the reactive chemical conversion treatment, which is an acidic solution containing aluminum ions, a silicon compound selected from a silicate and silica, a titanium compound, nitrate ions and citric acid. The liquid for the chemical conversion treatment may further contain one or more metal compounds selected from Mo, W, Ce, Co, Ni, Mg, Ca, Mn, Li, Zr, Fe, Sn, Y, La, Nd and Sm, and/or an organic acid selected from polyvalent carboxylic acids and hydroxy polyvalent carboxylic acids. COPYRIGHT: (C)2008,JPO&INPIT
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