Original Article

Corrosion behavior of laser powder bed fusion duplex stainless steel in soil simulated solution: effect of SO₄²⁻ concentration

¹ Electric Power Research Institute of State Grid Fujian Electric Power Company Limited, Fuzhou 350007, PR China
² Putian Coastal Atmospheric Environment Material Corrosion and Electric Power Equipment Safety Observation and Research Station of Fujian Privince, Putian, 351100, PR China
³ State Key Laboratory of Advanced Power Transmission Technology, China Electric Power Research Institute, Haidian District, Beijing 100192, PR China

^* e-mail: rogerchen614@163.com

Received: 10 June 2025
Accepted: 8 October 2025

Abstract

This study investigates the corrosion behavior of laser powder bed fusion (produced in simulated soil environments with varying sulfate ion (SO₄²⁻) 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 SO₄²⁻ 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. SO₄²⁻ 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 SO₄²⁻ 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.