Surface treated steel sheet
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United States of America Patent
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Mar 25, 2003
Grant Date -
N/A
app pub date -
Apr 25, 2001
filing date -
Aug 26, 1999
priority date (Note) -
Expired
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Abstract
The coated steel sheet is a zinc-based plated steel sheet which has a zinc phosphate-based coating containing magnesium thereon and a silicone resin coating containing a functional group which reacts with an organic substance on the surface of the zinc phosphate-based coating. The coated steel sheet has superior perforative corrosion resistance, paint adhesion, electrodesposition paintability, press formability, and weldability without using chromium and therefore is useful as an anti-corrosive steel sheet for automobile bodies.
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