Patent ID: 11926899
Assignee: RAYTHEON COMPANY
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 9:
10. 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, wherein the step of treating the surface with the hydrothermal treatment comprises exposing the surface to steam at 250-270 F (121-132 C) and 30-35 PSI for 50-60 minutes.