Hot dip zinc alloy plated steel sheet having excellent corrosion resistance and external surface and method for manufacturing same

  • US 9,745,654 B2
  • Filed: 07/23/2013
  • Issued: 08/29/2017
  • Est. Priority Date: 07/23/2012
  • Status: Active Grant
First Claim
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1. A hot-dip zinc alloy plated steel sheet having excellent corrosion resistance and an excellent external surface comprising:

  • a base steel plate; and

    a hot-dip zinc alloy plating layer,wherein a composition of the hot-dip zinc alloy plating layer includes, in % by weight, aluminum (Al);

    0.5 to 5.0%, magnesium (Mg);

    1 to 5%, and (a) indium (In);

    0.005 to 0.1% or (b) gallium (Ga);

    0.01 to 0.1% and indium (In);

    0.005 to 0.1%, a remainder of zinc (Zn) and unavoidable impurities, and a compositional ratio of the Mg and the Al satisfies the relationships of [Al+Mg≦

    7] and [Mg>

    Al], wherein the hot-dip zinc alloy plating layer employs a Zn—

    Al—

    MgZn2 ternary eutectic structure as a base structure, wherein the hot-dip zinc alloy plating layer includes a plating structure in which a Zn—

    MgZn2 binary eutectic structure is dispersed, wherein the hot-dip zinc alloy plating layer includes an Al single phase structure and a Zn single phase structure in an amount of 20% or less, and wherein the hot-dip zinc alloy plating layer includes a MgZn2 structure as a remainder.

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