Pitting corrosion resistance of cast duplex stainless steels in 3.5%NaCl solution

The pitting corrosion resistance of cast duplex stainless steels ASTM A890 grades 1A and 3A were evaluated at different temperatures in order to determine critical pitting temperatures (CPT) in 3.5%NaCl solution. Microstructures were changed by aging treatments at 850 °C for 15 min and 475 °C for 100 h. The CPT obtained values were compared and results were discussed taking into account microstructures and chemical compositions of the two materials.