High-corrosion-resistance hot-dip galvanized steel sheet having excellent appearance uniformity and manufacturing method thereof

  • US 9,481,148 B2
  • Filed: 06/29/2012
  • Issued: 11/01/2016
  • Est. Priority Date: 06/30/2011
  • Status: Active Grant
First Claim
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1. A high-corrosion-resistance hot-dip galvanized steel sheet having excellent appearance uniformity, comprising:

  • a coating layer containing Al;

    4 to 22 mass %, Mg;

    1 to 6 mass %, and Si;

    0.001 to 1 mass %, and a balance being composed of Zn and inevitable impurities formed on a surface, whereinat an interface between said coating layer and a base steel sheet, Mg2Si phases and Ca phases each mainly composed of Ca or a Ca compound exist, and at least part of the Mg2Si phases precipitate by using the Ca phases as a nucleus,an average diameter of Al/MgZn2/Zn ternary eutectic phases existing in said coating layer is 5 to 200 μ

    m, andan interface Ca intensity at the interface between said coating layer and the base steel sheet is 0.1 to 1.0.

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