Process for application of oxyhydroxides coating for aluminum containing material
AssigneeRaytheon Company
InventorThiru Munisamy
Life of this patent
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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.
Claims20
A process for coating a surface of an aluminum containing material, comprising:
- 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 surface with a hydrothermal treatment immediately subsequent to the high alkaline treatment providing the surface of the aluminum containing material with a chromate-free coating.
A process for coating a surface of an aluminum containing material, comprising:
- degreasing a surface of an aluminum containing material in an immersion tank for 5-10 minutes at a pH of 9-11 and temperature of 110-150 F (43-66 C) to produce a degreased surface;
- treating the degreased surface in a high alkaline treatment immersion tank immediately subsequent to the degreasing for 30 seconds-3 minutes at a temperature of 135-150 F (57 -66 C), with a pH greater than 12 to produce an alkaline treated surface having smut on the surface;
- and
- treating the alkaline treated surface with a hydrothermal treatment immediately subsequent to the high alkaline treatment for 20-60 minutes, wherein smut from the high alkaline treatment is not removed and the aluminum alkaline treated surface having smut on the surface is directly subjected to the hydrothermal treatment immersion providing the surface of the aluminum containing material with a chromate-free coating.
A process for coating a surface of an aluminum containing material, comprising:
- degreasing a surface of an aluminum containing material in an immersion tank for 5-10 minutes at a pH of 9-11 and temperature of 110-150 F (43-66 C) to produce a degreased surface;
- treating the degreased surface in a first high alkaline treatment immersion tank immediately subsequent to the degreasing to produce an alkaline treated surface having smut on the surface;
- deoxidizing the alkaline treated surface having smut on the surface subsequent to the first high alkaline treatment;
- treating the deoxidized and the alkaline treated surface in a second high alkaline treatment immersion tank immediately subsequent to the deoxidizing for 30 seconds-3 minutes at a temperature of 135-150 F (57-66 C), with a pH greater than 12;
- and
- treating the aluminum with a hydrothermal treatment immediately subsequent to the high alkaline treatment for 20-60 minutes, wherein smut from the high alkaline treatment is not removed and the aluminum is directly subjected to the hydrothermal treatment immersion providing the surface of the aluminum containing material with a chromate-free coating.
Dependencies are inferred from the claim text.