Corrosion behavior of laser powder bed fusion duplex stainless steel in soil simulated solution: effect of SO 4 2− concentration

This study investigates the corrosion behavior of laser powder bed fusion (produced in simulated soil environments with varying sulfate ion (SO 4 2− ) concentrations. As grounding grids critical components in power systems - face significant corrosion challenges in soil, this research evaluates the innovative application of 3D-printed 2205 DSS. The results demonstrated that increasing SO 4 2− concentration (0 to 1 mol/L) significantly enhanced the corrosion tendency of 2205 DSS, as evidenced by a negative shift in corrosion potential, increased corrosion current density, and reduced polarization resistance. SO 4 2− deteriorated the stability of the passive film, increased oxygen vacancy density, and promoted localized corrosion, thereby accelerating material degradation. Furthermore, the passive film formed in high SO 4 2− environments was thinner and more defective, further compromising corrosion resistance. The findings provide a critical knowledge gap in the field of additive-manufactured corrosion-resistant alloys for power infrastructure applications.