Influence of thermal treatments between 650 and 850°C on the pitting corrosion behaviour of 2304 duplex stainless steel

摘要

In this research the effect of thermal treatments within 650-850°C on the pitting corrosion behaviour of a Duplex stainless steel (DSS) type 2304 was investigated. DSS 2304 was treated for 5, 10 and 60 minutes at 650, 750 and 850°C. The pitting resistance of the treated samples was estimated in 1 M NaCl solution by the anodic polarization curve recording and by the Critical Pitting Temperature (CPT) technique. The results showed that DSS 2304 resistance to pitting corrosion decreased by increasing the treatment time and by decreasing the treatment temperature. The most critical conditions were the longest treatment time (60 min) at 650 and 750°C.