The interaction of surface engineering and high temperature corrosion protection

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Abstract
The interaction between surface engineering and corrosion resistance of 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 utilized technologically to provide high temperature corrosion protection, namely surface alloying, diffusion coatings and also metallic and ceramic overlay coatings, are discussed. The various ways in which surface engineering can interact with high temperature corrosion resistance are considered. Thus, the main purpose of the surface layer can be solely to afford protection, but in other cases, such as with thermal barrier coatings, the surface layers have another primary task, but additionally provide corrosion resistance. Finally, the important role of surface modification techniques, in particular ion implantation, as a research tool for corrosion science is highlighted.

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