BRIGHT COATINGS FOR ALUMINUM OR STEEL MOTOR VEHICLE WHEELS AND THEIR PRODUCTION
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United States of America Patent
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Issued Date -
Jan 28, 2010
app pub date -
Jan 16, 2008
filing date -
Jan 30, 2007
priority date (Note) -
Abandoned
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Abstract
Surface coating having a bright appearance on motor vehicle wheels made of light metal alloy castings or steel, which can comprise a plurality of layers, wherein it has at least one first layer composed of aluminum or aluminum alloy which is applied directly to the wheel surface, which has metallic brightness, and a method for producing a resistant bright coating on aluminum alloy or steel surfaces, which comprises the steps gas-phase deposition of aluminum or Al alloy to form a first dense and bright coating electrochemical oxidation of the surface of the first layer and formation of a nanoporous to microporous second layer of aluminum oxide having a thickness in the range from 50 to 1000 nm.
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