Comparative study between large-scale and small-scale electrochemical potentiokinetic reactivation performed on AISI 316L austenitic stainless steel

This work optimizes the application of electrochemical potentiokinetic reactivation (EPR) to assess the degree of sensitization (DOS) of AISI 316L and compares the large-scale and small-scale EPR with the aim of improving the study of the different zones of AISI 316L welded joints by using an electrochemical minicell. The optimized EPR allows to discriminate better than the standardized EPR among different DOS. Small-scale EPR shows greater sensitivity to assess the DOS than large-scale EPR: (i) at lower deformation levels; (ii) for shorter sensitization times; (iii) when localized microstructural regeneration is caused by the combined effect of deformation and subsequent sensitization.

► Application of EPR test to assess the DOS of AISI 316L ASS is optimized. ► Results of large-scale and small-scale EPR are compared. ► Small-scale EPR shows greater sensitivity at lower deformation levels. ► Small-scale EPR shows greater sensitivity for shorter sensitization times. ► Localized microstructural regeneration is detecting by small-scale EPR.