A study on the erosion-corrosion behaviour of engineering materials used in the geothermal industry

Erosion-corrosion can be a significant issue for engineering components used in the geothermal industry. This study assesses erosion-corrosion behaviour of wide range alloys which are various parts power plants. The evaluated materials comprised carbon steel, low-alloy three grades stainless steel together with Ni–Cr alloy (Inconel 625) and Ti–6Al–4V. Tests were conducted by utilising submerged 90° impinging slurry jet consisting silica sand particles suspended an acidic (pH 4) aqueous solution 3.5% NaCl. Gravimetric mass losses, in-situ potentiodynamic polarisation scans enhanced volumetric analysis technique to assess influence hydrodynamic conditions on test materials. effect applied cathodic protection was also examined. Post-test metallurgical examination via SEM. results showed distinct differences between low steels “corrosion resistant” – former demonstrating substantial material loss low-angle corrosive wear region due large amounts corrosion-related damage. Both superaustenitic (UNS S31254) Inconel 625 N06625) exhibited greatest resistance high angle wear. relevance findings selection other methods against surface degradation plants is discussed. • commonly components. Carbon attack conditions. UNS S31254 & N66250 highest resistance. demonstrated