Hot dip zinc alloy plated steel sheet having excellent corrosion resistance and external surface and method for manufacturing same
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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Abstract
Provided is a hot dip zinc alloy plated steel sheet which is widely used in vehicles, domestic appliances, construction materials or the like and a method for manufacturing the same. A Zn—Al—Mg hot dip zinc alloy plating bath is used for manufacturing the hot dip zinc alloy plated steel strip, and a small amount of Ga or In is added to the plating bath for inhibiting an oxidation reaction of Mg in the plating bath so as to obtain excellent corrosion resistance and external surface of the plated steel sheet which is manufactured at this point.
5 Citations
7 Claims
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1. A hot-dip zinc alloy plated steel sheet having excellent corrosion resistance and an excellent external surface comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification