Novel Composite Chemical Conversion Coating Film, Multiple Layered Coating Film Using the Same and Process for Forming Multiple Layered Coating Film
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United States of America Patent
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Issued Date -
Aug 20, 2009
app pub date -
Mar 5, 2007
filing date -
Mar 7, 2006
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Abandoned
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Abstract
at upper limit by cathode electrolysis and (B) the second step of coating an electrodeposition coating composition containing an organic acid or inorganic acid salt of a rare earth metal by cathode electrodeposition. According to the present invention, provided is a multiple layered coating film that forms extremely less amount of a composite chemical conversion coating film and an electrodeposition coating film in order in comparison with a pretreatment step and a cationic electrodeposition coating step by a conventional chemical coating solution and an electrodeposition coating composition; that is, a novel composite chemical conversion coating film with high economic efficiency and environmental conservation property is provided by expressing superior adhesion to a coating film and corrosion resistance equal to or more than a conventional step.
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