Corrosion Resistance of Dissimilar Steel Welding Joint of 2205 and 15MnNiCrMoV

Using the method of steel component analysis and metallographic analysis, the corrosion products of welding joint of duplex stainless steel 2205 and low carbon alloy 15MnNiCrMoV immersed in HCl and H2SO4 solution (10%,mass fraction) at 35 ℃ were studied. The results show that the corrosion resistance of welding joint was poor in the HCl solution, and corrosion resistance of the heat affected zone was poorer than that of weld area. The corrosion of welding joint of 15MnNiCrMoV side was more serious in the H2SO4 solution, especially with its heat affected zone. However, the welding joint compound did not have any corrosion in the side of duplex stainless steel 2205, due to the form ation of passivation films, such as Cr2O3, FeO and Cr-O on the surface of duplex stainless steel 2205, which can prevent corrosion.