Surface Modification Concepts for Enhancement of the High-Temperature Corrosion Resistance of Gas Turbine Superalloys

摘要

This report summarizes the current view of the mechanisms of the phenomenon of hot corrosion, whereby the surface integrity of gas turbine superalloys is degraded, and also the principal types of protective coating applied to aerofoil components made of these materials to inhibit hot corrosion and extend their useful lives. A concept is presented that the high-temperature corrosion resistance of superalloys can be significantly enhanced by selective modification of the composition and structure of their parasurface zones, utilizing new methods of surface treatment such as ion implantation, laser alloying, and thermal passivation. (Author)