Surface treated steel sheet and method for production thereof
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United States of America Patent
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Apr 29, 2003
Grant Date -
N/A
app pub date -
May 17, 2001
filing date -
Sep 17, 1999
priority date (Note) -
Expired
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Abstract
The coated steel sheet includes a zinc phosphate coating containing Mg on a surface of a galvanized steel sheet, and an orthophosphoric acid ester-containing coating on a surface of the zinc phosphate coating. The coated steel sheet has no coating fall-off even during a chemical conversion treatment step of an automobile producing line and has excellent perforative corrosion resistance either with no-painting or after electrodeposition painting, chemical conversion treatability and press formability.
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