Inorganic-organic composite-treated zinc-plated steel sheet
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United States of America Patent
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Mar 14, 2006
Grant Date -
Feb 17, 2005
app pub date -
Jun 24, 2004
filing date -
Jul 8, 2003
priority date (Note) -
Expired
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Abstract
The present invention is intended to provide an inorganic-organic composite-treated zinc-plated steel sheet whose treated coatings do not contain any hazardous chromate and which is excellent in corrosion resistance after alkaline degreasing and coating adhesion. An inorganic-organic composite-treated zinc-plated steel sheet which has a zinc phosphate coating, in a coating weight of 0.3 to 5 g/m2, on the zinc-plated steel sheet surface and, thereon, a post-treatment coating, in a coating weight of 0.01 to 1 g/m2, containing an organic resin (A), a zirconium compound (B), an inorganic corrosion inhibitor (C) and an organic corrosion inhibitor (D).
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