最佳铈微合金化增强了SASS/Q235焊缝的耐腐蚀和抗菌性能。

Optimal cerium microalloying enhances SASS/Q235 weld corrosion and antibacterial performance.

作者信息

Liu Xingbin, Jiang Quantong, Li Haojun, Lu Dongzhu, Zhai Xiaofan, Liu Nazhen, Duan Jizhou, Hou Baorong

机构信息

State Key Laboratory of Advanced Marine Materials, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.

School of Materials Science and Engineering, Qilu University of Technology, No.3501, Daxue Road, Jinan 250353, China.

出版信息

iScience. 2025 Aug 6;28(9):113319. doi: 10.1016/j.isci.2025.113319. eCollection 2025 Sep 19.

DOI:10.1016/j.isci.2025.113319

PMID:40927679

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12415021/

Abstract

Super austenitic stainless steels (SASS) face challenges like galvanic corrosion and antibacterial performance when welded to carbon steel (Q235) in marine environments. This study demonstrates that adding 1.0 wt% cerium (Ce) to SASS refines the heat-affected zone (HAZ) grain structure (from 7 μm to 2 μm), suppresses detrimental σ-phase precipitation, and forms a dense oxide film. Electrochemical analyses confirmed this optimized composition increases charge-transfer resistance (to 2.2 × 10 Ω cm) and reduces passivation current density (to 0.12 μA/cm), significantly enhancing corrosion resistance. Additionally, 1.0 wt% Ce disrupts sulfate-reducing bacteria (SRB) membranes, reducing survival to <1%. However, excess Ce (≥1.5 wt%) forms coarse CeO particles, accelerating corrosion via porous films and micro-galvanic coupling. These findings provide a practical strategy for designing corrosion-resistant, antimicrobial welded joints in marine infrastructure.

摘要

超级奥氏体不锈钢（SASS）在海洋环境中与碳钢（Q235）焊接时面临电偶腐蚀和抗菌性能等挑战。本研究表明，向SASS中添加1.0 wt%的铈（Ce）可细化热影响区（HAZ）的晶粒结构（从7μm细化至2μm），抑制有害σ相析出，并形成致密的氧化膜。电化学分析证实，这种优化后的成分可提高电荷转移电阻（至2.2×10Ω·cm）并降低钝化电流密度（至0.12μA/cm），显著增强耐腐蚀性。此外，1.0 wt%的Ce会破坏硫酸盐还原菌（SRB）的细胞膜，使存活率降至<1%。然而，过量的Ce（≥1.5 wt%）会形成粗大的CeO颗粒，通过多孔膜和微电偶耦合加速腐蚀。这些发现为设计海洋基础设施中耐腐蚀、抗菌的焊接接头提供了一种实用策略。