The susceptibility of 17Cr ferrite stainless steel to intergranular corrosion (IGC) was investigated using the double loop electrochemical potentiokinetic reactivation (DL-EPR) test and the microstructural characterisation. The results show that the optimised DL-EPR test condition for 17Cr ferrite stainless steel is l M H2SO4 + 0.006 M KSCN solution with a scan rate of 0.1 V min−1 at 25°C The severe IGC occurs in the temperature range of 500-650°C and the nose temperature locates at approximately 600°C. The Ir/Ia value rises up to 16.99% when heat treated at 600°C for 30 min. After aging treatment, M23C6 precipitates are detected using transmission electron microscopy, resulting in the presence of the Cr depletion zone. However, the degree of IGC for 436L is extremely limited due to the Cr element diffusion form the matrix despite prolonging the aging time to 5 h.
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