Surface-treated steel sheet and production method therefor
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United States of America Patent
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Jan 13, 2004
Grant Date -
Oct 24, 2002
app pub date -
Dec 17, 2001
filing date -
Apr 21, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A surface-treated steel sheet includes a steel sheet, an Al--Zn-base alloy plating layer formed on the steel sheet, a chemical conversion film provided on the alloy plating layer, and a concentric layer of a Cr compound that is formed on the alloy plating layer of the chemical conversion film. The surface-treated steel sheet may include a steel sheet, an zinc-base plating layer formed on the steel sheet, and a film that contains chromium and calcium and that is formed on the zinc-base plating layer.
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