Abstract
Abstract The effectiveness of electrochemical techniques in characterizing the corrosion resistance of welded super duplex stainless steels has been evaluated. Localized corrosion of the alloy-depleted zone associated with sigma-phase formation is the primary concern, with specific interest in the extent to which various methods could predict the likelihood of sustained propagation of corrosion damage due to connectivity of depleted zones. Testing was carried out on a solution-annealed super duplex stainless steel, on samples isothermally heat-treated for different periods, and on welded pipe sections produced with different heat inputs. In addition, a failed weld from service was investigated. Three electrochemical methods were utilized, viz., critical pitting temperature (CPT) measurement, electrochemical potentiodynamic reactivation (EPR), and a novel galvanostatic test. All three electrochemical methods showed sensitivity to the extent of sigma-phase content in the isothermally heat-treated samples. T...
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