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METAL SURFACE TREATMENT LIQUID, SURFACE TREATMENT METHOD FOR METAL BASES, AND METAL BASE OBTAINED BY SURFACE TREATMENT METHOD FOR METAL BASES
METAL SURFACE TREATMENT LIQUID, SURFACE TREATMENT METHOD FOR METAL BASES, AND METAL BASE OBTAINED BY SURFACE TREATMENT METHOD FOR METAL BASES
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机译:金属表面处理液,金属基体的表面处理方法以及金属基体的表面处理方法获得的金属基体
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摘要
Provided is a means for further increasing corrosion resistance in comparison with conventional zirconium-based chemical conversion coating films and bismuth-based chemical conversion coating films. A metal surface treatment liquid for use in forming a composite coating film containing a Bi element and a Group 4 element on a metal base, which is a fluorine-free aqueous treatment liquid obtained by adding (A) a Bi element source, (B) a multimer of at least one Group 4 element selected from the group consisting of Zr, Ti and Hf elements, and (C) one or more aminopolycarboxylic acids or salts thereof.
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