B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
117/128
B32B 15/04 (2006.01) B01J 21/04 (2006.01) B01J 23/86 (2006.01) B01J 37/02 (2006.01) C23C 8/80 (2006.01) F01N 3/10 (2006.01)
Patent
CA 1149243
D-3,640 C-3215 APPLICATION OF AN ALUMINA COATING TO OXIDE WHISKER-COVERED SURFACE ON AL-CONTAINING STAINLESS STEEL FOIL Abstract of the Disclosure In a preferred embodiment, a method is disclosed for applying a gamma alumina coating to a metal foil composed of an aluminum-containing ferritic stainless steel alloy and having an oxidized surface that is substantially covered by high-aspect alumina whiskers. The method comprises wetting the whisker- covered surface with a thixotropic alumina gel formed by mixing between about 4% to 6% by weight alumina monohydrate in water and acidifying with nitric acid to a pH below 2Ø While still wet, the primed surface is coated with a material consisting of gamma alumina powder suspended in a similar acid-stabilized aqueous alumina gel. The two-coat layer is air-dried and additional layers of the powder-containing material are applied and dried to form a gamma alumina coating of desired thickness.
368842
Chapman Lloyd R.
Watton John F.
General Motors Corporation
Gowling Lafleur Henderson Llp
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