Investigation of the effect of solution annealing temperature on critical pitting temperature of 2205 duplex stainless steel by measuring pit solution chemistry

•The effect of solution annealing temperature on the CPT of 2205 DSS is investigated.•Solution annealing at 1250 °C causes 8 °C drop in alloy CPT.•Specimen with lower CPT showed lower diffusing limiting current density.•Specimen with lower CPT showed higher maximum pit current density.

In this research, the effect of solution annealing temperature on critical pitting temperature of DSS 2205 in 3.5 wt.% NaCl solution and also the pit chemistry is studied using electrochemical methods and mechanistic analyses. Pencil electrode studies revealed that in comparison to samples solution annealed at 1050 °C and 1150 °C, maximum current density in simulated pit solution is increased and limiting current density in presence of salt film is decreased for alloy solution annealed at 1250 °C. Based on these results and microscopic observations, lower CPT of DSS 2205 solution annealed at 1250 °C is explained.