| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al-Zn-Mg based alloy plated steel product which has excellent corrosion resistance. SOLUTION: On the plane analysis of the cross-section in a plating film on the surface of steel by using an X-ray microanalyzer, an Al-Zn phase in which Al and Zn are precipitated on the same region, and essentially consisting of those elements, a Zn-enriched phase segregated on the grain boundary of the Al-Zn phase, and essentially consisting of Zn, and an Mg-Si phase in which Mg and Si are precipitated on the same region have been confirmed. The Al-Zn phase occupies the volume of >=50% in the plating film, and at least a part of the Mg-Si phase is precipitated on the surface of the plating film.
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