CONTINUOUS SURFACE TREATMENT FOR COILS MADE OF ALUMINUM ALLOYS SHEETS
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United States of America
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Mar 24, 2022
app pub date -
Jan 17, 2020
filing date -
Jan 17, 2020
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Abstract
The invention relates to a continuous coil surface treatment process suitable for both a coil of a 5XXX aluminum alloy sheet and of a 6XXX aluminum alloy sheet. The process comprises the successive steps of etching the surface with a fluorine-free acidic solution; rinsing with deionized water; applying a conversion solution comprising titanium and zirconium, and drying. The invention surface treatment method is environmentally friendly and enables the production of the treated surfaces in an efficient and reliable manner for both 5XXX and 6XXX alloys. It is particularly adapted for the production of aluminum alloy sheets for the automotive industry.
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