Role of Tungsten, Niobium, and Vanadium on Corrosion Resistance of Austenitic Stainless Steels in Chloride Ion Environment

摘要

The effect of addition of refractory elements; Tungsten, Niobium and Vanadium, on the corrosion resistance of austenitic stainless steels in chloride environment were investigated. Corrosion resistance was evaluated under conditions of immersion, potentiodynamic polarization and cyclic polarization vs. SCE in corrosive medium of 1.5, 2.5, and 3.5%NaCl salts. An increment of temperatures was also used; room temperature, 50 and 90 °C. The results showed that Fe-25Ni-15Cr-2W-2Nb-lV alloys have the lowest tendency of pitting corrosion to occur compared to other alloys. The increase of temperatures of these alloys demonstrated an improvement of corrosion resistance, especially for Fe-25Ni-15Cr-2W-2Nb-lV.