Patent ID: 6565931
Filing Date: 2003-05-20
Classification: C23C,Y02T

Abstract:
A method of applying a corrosion protective coating to a region of metallic article, comprising the steps of:applying a layer of platinum-group metal to said region of the metallic article, the region of the metallic article comprising a gamma phase and a gamma prime phase, heat treating the metallic article to diffuse the platinum-group metal into the metallic article and thereby create a platinum-group metal enriched outer layer on the metallic article, the heat treatment being carried out at a temperature and for a time sufficient such that the platinum-group metal enriched outer layer of the metallic article predominantly comprises a platinum-group metal enriched gamma phase and platinum-group metal enriched gamma prime phase, wherein the metallic article is a turbine blade and the turbine blade comprises an aerofoil, a platform, a shank and a root, and the coating is applied to the root and/or shank of the turbine blade and the coating on the root and/or shank consists essentially of said platinum-group metal enriched outer layer.