Application of double loop electrochemical potentio-kinetic reactivation for characterizing the intergranular corrosion susceptibility of stainless steels and Ni-based alloys in solar nitrate salts used in CSP systems

• The DL-EPR was deployed to investigate the DOS in materials molten salt systems. tendency for IGC increased after aging at CSP system temperatures. studied synergic effect of and temperature on tendency. In this study, sensitivity four corrosion resistant candidate alloys; austenitic stainless steels (AISI 321 AISI 347) Ni-based alloys (IN 625 825) degrade by intergranular when used with salts conditions systems were investigated different This achieved implementing Double loop electrochemical potentiokinetic reactivation (DL-EPR) technique quantitatively measure degree sensitisation (DOS) selected air without Solar Salts (60 wt% NaNO 3 40 KNO ) 550–750 °C 2 h. Electrochemical etching implemented further verify results from DL-EPR. show that microstructural evaluation techniques can be assess synergy activities attack occur CPS IN showed highest resistance among both salt; especially temperatures higher than stability temperature. Samples aged samples across all linked Cr-consuming chemical reactions drives – alloy interaction plants.