Investigation of the combination of Cu and Ce effects on enhancing antibacterial and biocorrosion resistance performances of 2205 duplex stainless steel

作者：G.T. Zhang, Xin-Xin Wei, Z.Q. Hu, Ke Tang, Tingyue Gu, Enze Zhou, B. Zhang, Xiuliang Ma · 发表于：Corrosion Communications · 年份：2025 · DOI：10.1016/j.corcom.2025.11.001 · 被引用次数：2 · 研究领域：Hydrogen embrittlement and corrosion behaviors in metals、Corrosion Behavior and Inhibition、Marine Biology and Environmental Chemistry

• Both Cu and Ce additions promote phase coarsening, reducing phase boundary density. • Ce is released solely through stochastically distributed Ce precipitates. • The combination of Cu and Ce bactericidal effects culminates in 95.9%. • Biofilm thickness decreased 82.6% in 2205-Cu-Ce-3 DSS. • 2205-Cu-Ce-3 DSS shows 84.2% lower corrosion current than 2205 DSS. Duplex stainless steels (DSSs) are widely utilized in marine environments due to their excellent mechanical properties and chloride corrosion resistance. However, their susceptibility to microbiologically influenced corrosion (MIC) remains a critical challenge. This study systematically investigates the antibacterial mechanisms of Cu and Ce microalloying in 2205 DSS against Bacillus vietnamensis through a multiscale approach. Our results demonstrate that Cu and Ce additions promote phase coarsening, thereby reducing phase interface density and electrochemical activity. Transmission electron microscopy (TEM) analysis identifies distinct diffusion pathways: Cu ions are released from the metal matrix via solid solution dissolution in the γ phase and surface precipitate degradation in the δ phase, while Ce ions are released solely through the dissolution of Ce precipitates. Electrochemical tests, corrosion morphology analysis, and microbiological assays collectively indicate that Ce incorporation (0.08%–0.30%, mass fraction) significantly enhances the antibacterial efficacy and MIC resistance of 2205-Cu DSS. The stochastic d...