In Geo-Coat project, laboratory-based tests in simulated geothermal conditions have been performed. Corrosion resistance, erosion wear, erosion-corrosion wear, sliding wear, contact angle and cost performance have been evaluated for each material/substrate combination selected for the project. Systems prepared (i.e. deposited and manufactured for coatings and MMCs respectively) on each substrate have then been scored and ranked together with the state-of-the-art wrought alloy currently employed for the specific application.