Colored conversion layers on metal surfaces
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United States of America Patent
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Oct 23, 2012
Grant Date -
Aug 3, 2006
app pub date -
Jan 31, 2006
filing date -
Aug 26, 2003
priority date (Note) -
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Abstract
Chromium-free conversion coating treatment solutions and processes for depositing a colored layer on zinc or galvanized steel, aluminum, magnesium or their alloys, are provided comprising: hexafluorotitanate and/or hexafluorozirconate ions; molybdate and/or tungstate ions; one or more chelating complex formers; and a copolymer of alkylene phosphonic or alkylene phosphinic acid and one or more unsaturated carboxylic acids.
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