| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a steel sheet covered with a conversion treatment film, which is a steel strip covered with a conversion treatment film obtained by continuously and cathodically electrolyzing the steel strip in a treatment solution that contains Zr fluoride ions, while stably supplying Zr ions to the treatment solution. SOLUTION: The treatment solution contains the Zr ions of 0.05 to 30 g/L, and fluorine ions in an amount of 0.5 to 10 times of Zr ions. The manufacturing method includes supplying the Zr ions to the treatment solution with the use of two or more types of Zr compounds selected from the group consisting of a Zr halide, Zr hydroxide, Zr carbonate, a Zr ammoniate, Zr nitrate, Zr sulfate and Zr acetate, in cathodic electrolysis treatment. The treatment solution contains the ions originating in the selected two or more types of the Zr compounds in an amount of 10 times of Zr ions or less, respectively. COPYRIGHT: (C)2009,JPO&INPIT
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