This work aims to investigate the relation between PREN of ferrite and austenite and the pitting potential of UNS S31803 DSS. Samples were solution-treated
between 1040 °C and 1150 °C generating different phase
fractions and, consequently, different alloy element contents. ThermoCalc® thermodynamic simulations were
performed to predict the chemical composition of each
phase allowing the PREN calculations. Besides, potentiodynamic polarization tests were conducted in 0.6M NaCl
solution at 70 °C to correlate pitting potential (Epit) and
PREN. Thermodynamic simulation reveals that PREN for
ferrite is higher than austenite between 975 °C and 1300 °C.
Nevertheless, the electrochemical results show a slight reduction of pitting potential with increasing ferrite content,
probably related to the reduction of Cr and Mo contents in
this phase. Pits were found preferably in ferrite and in ferrite/austenite interfaces. This behavior suggests that, even
with only a slight reduction of pitting potential and, consequently, a discrete corrosion resistance reduction, ferrite is
more susceptible to pitting. No pits were found in austenite, suggesting that higher N contents are fundamental to
maintain the corrosion resistance of this phase.
