Conversion Coating and Process and Solution for Its Formation

摘要

A process for forming a conversion coating on the surface of a metal, including: contacting the metal with an acidic solution containing an oxidan t 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.