PROCESS FOR APPLICATION OF OXYHYDROXIDES COATING FOR ALUMINUM CONTAINING MATERIAL
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United States of America Patent
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Issued Date -
Jun 9, 2022
app pub date -
Dec 4, 2020
filing date -
Dec 4, 2020
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Abstract
A process for providing a surface of aluminum containing materials with a chromate-free protective coating includes degreasing a surface of an aluminum containing material to produce a degreased surface, treating the degreased surface in a high alkaline treatment immediately subsequent to the degreasing to produce an alkaline treated surface having smut on the surface, and treating the alkaline treated smut surface with a hydrothermal treatment immediately subsequent to the high alkaline treatment.
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