Zn-Al-Mg-Si-alloy plated steel product having excellent corrosion resistance and method for preparing the same
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United States of America Patent
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Oct 21, 2003
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N/A
app pub date -
Feb 8, 2002
filing date -
Aug 9, 1999
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Abstract
A Zn--Al--Mg--Si alloy-plated steel material with excellent corrosion resistance, characterized by comprising, in terms of wt %, Al: at least 45% and no greater than 70%, Mg: at least 3% and less than 10%, Si: at least 3% and less than 10%, with the remainder Zn and unavoidable impurities, wherein the Al/Zn ratio is 0.89-2.75 and the plating layer contains a bulky Mg.sub.2 Si phase; also, a Zn--Al--Mg--Si alloy-plated steel material with excellent corrosion resistance, characterized by comprising, in terms of wt %, Al: at least 45% and no greater than 70%, Mg: at least 1% and less than 5%, Si: at least 0.5% and less than 3%, with the remainder Zn and unavoidable impurities, wherein the Al/Zn ratio is 0.89-2.75 and the plating layer contains a scaly Mg.sub.2 Si phase.
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