Sn-based metal-coated steel strip excellent in appearance and process for producing same
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United States of America Patent
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Jun 21, 2005
Grant Date -
Mar 11, 2004
app pub date -
Jul 9, 2003
filing date -
Sep 10, 2002
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Abstract
A Sn-based metal-coated steel strip excellent in appearance comprises a Ni-based metal (such as Ni, a Ni-Sn alloy, a Ni-Zn alloy, a Ni-Fe alloy and a Ni-Co alloy) preplating layer and a Sn-based metal (such as a Sn-Zn alloy) coating formed thereon, and is characterized in that a Ni emission intensity line and an Fe emission intensity line obtained by glow discharge spectroscopy of the surface of the coated steel strip satisfy a relationship of the formula: T1≧T2 wherein T1 is a sputtering time at the peak of a Ni emission intensity line, and T2 is a sputtering time at the inflection point of an Fe emission intensity line, or a relationship of the formulas: T1≧T2, and 1≦T1/T2≦1.5
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