Abstract
The corrosion behavior of High Entropy Alloy (HEA), wear-resistant cermets, self-fluxing Ni alloy, and Fe-based amorphous alloy coatings were investigated in simulated alkaline high-temperature geothermal environments with/without H2S and CO2 gases for geothermal applications. Phase density of the corrosive fluid (liquid/vapor) influenced the corrosion behavior in the test environments. The NiCrSiBFe self-fluxing coating formed a continuous corrosion surface film while the FeCrMoWMnBCSi amorphous coating was prone to localized corrosion in the liquid phase. The cermet coatings had pores and cracks that led to localized penetration while the CoCrFeNiMo0.85 HEA showed the highest corrosion resistance in all test environments with no localized corrosion damage.
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