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The effect of solution heat treatment on the pitting corrosion resistance of17Cr-6Mn-5Ni-1.5Cu austenitic stainless steel in 0.6M NaCl aqueous solution wasevaluated. UNS S30403 (304L) steel was used as benchmark material. Solution heattreatments (SHT) were conducted at 1010°C, 1040°C, 1070°C and 1100°C. The microstructuralcharacterization revealed the presence of δ-ferrite, especially in the asreceivedcondition (AR). The SHT decreased the proportion of the ferrite phase. Mnrichprecipitates were observed in the as-received condition of 17Cr-6Mn-5Ni-1.5Custeel, but they were dissolved after the SHT, causing localized Mn enrichment in theaustenite. Potentiodynamic tests showed that the pitting potential (Ep) in the 304Lsteel was not altered significantly after SHT. On the other hand, the value of Ep ofthe 17Cr-6Mn-5Ni-1.5Cu steel decreased after SHT. This detrimental effect was explainedby the formation of Mn enrichment areas due to the solubilization of Mn-richprecipitates, which promoted preferential Cl- adsorption in these region

Effect of solution heat treatment on the pitting corrosion behavior of a high Mn austenitic stainless steel in chloride solution