Multilayer plated fuel line parts for automobile
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United States of America Patent
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Issued Date -
Oct 27, 2005
app pub date -
Dec 29, 2004
filing date -
Jul 24, 2002
priority date (Note) -
Abandoned
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Abstract
A trivalent chromate coating having improved surface smoothness is used as an alternative to a hexavalent chromate coating serving as a protective coating. A piping member of a steel for an automotive fuel line is coated with a multilayer coating consisting of a plated Zn--Ni alloy film as a bottom layer, a plated Zn film as an intermediate layer overlying the plated Zn--Ni alloy layer, and a trivalent chromate layer as a top layer overlying the plated Zn film.
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