Chemical conversion layer, and a method of forming the same soln.

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PCT No. PCT/AU95/00340 Sec. 371 Date Apr. 7, 1997 Sec. 102(e) Date Apr. 7, 1997 PCT Filed Jun. 9, 1995 PCT Pub. No. WO95/34693 PCT Pub. Date Dec. 21, 1995A process for forming a conversion coating on the surface of a metal, including : contacting the metal with an acidic solution containing an oxidant in order to initiate growth of a metal oxide cell structure on the metal surface; contacting the metal with water for a period of time sufficient to thicken the oxide and form a metal oxide containing layer of a desired thickness; and treating the metal with one or more rare earth elements in order to impregnate and substantially seal the metal oxide.