THE INTERACTION OF SURFACE ENGINEERING AND HIGH-TEMPERATURE CORROSIONPROTECTION

The interaction between surface engineering and corrosion resistance o f high temperature materials is reviewed. A brief description is given of high temperature corrosion, while criteria for surface engineering are outlined. The most important classes of surface treatments utiliz ed technologically to provide high temperature corrosion protection, n amley surface alloying, diffusion coatings and also metallic and ceram ic overlay coatings, are discussed. The various ways in which surface engineering can interact with high temperature corrosion resistance ar e considered. Thus, the main purpose of the surface layer can be solel y to afford protection, but in other cases, such as with thermal barri er coatings, the surface layers have another primary task, but additio nally provide corrosion resistance. Finally, the important role of sur face modification techniques, in particular ion implantation, as a res earch tool for corrosion science is highlighted.