Microbial synergistic corrosion of Ti30ZrAlV alloy: Acid dissolution-electron transfer coupling mechanism

IF 7.8 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2025-10-10 DOI:10.1016/j.psep.2025.107992

Zhihao Feng , Yu Zhao , Qian Feng , Kaimin Wei , Huicong Dong , Shan Liu , Jiangang Wang , Guang Chen , Jianhui Li

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引用次数: 0

Abstract

With the advancement of marine engineering equipment towards deep-sea operations, the threat of microbial corrosion faced by titanium-zirconium (Ti-Zr) alloys has become increasingly prominent. However, the deterioration mechanisms of materials under multi-species synergistic effects remain unclear. This study systematically investigated the corrosion behavior and synergistic mechanisms of Ti30ZrAlV (T30ZAV) alloy in a co-culture system of P. aeruginosa and C. farmeri through simulated marine microbial environments. A synergistic "acid dissolution-electron transfer" mechanism was revealed by integrating electrochemical measurements (OCP, LPR, EIS, Tafel polarization curve), surface morphology analysis (SEM, CLSM), and corrosion product characterization (XPS), which can break down passive films in mixed microbial environments. Results demonstrated that the corrosion current density (i_corr) of T30ZAV alloy in mixed cultures reached 22.2 μA·cm⁻², sixfold higher than in abiotic conditions (3.6 μA·cm⁻²) and significantly exceeding values in monocultures (P. aeruginosa: 8.7 μA·cm⁻²; C. farmeri: 11.4 μA·cm⁻²). The maximum pit depth in the dual-species system reached 2.037 μm, nearly twice that in abiotic conditions (0.921 μm). XPS analysis confirmed that the passive film (TiO₂-ZrO₂) was severely degraded, with reduced Ti⁴⁺ and Zr⁴⁺ peak intensities and enhanced Ti³⁺ and metallic Ti/Zr signals, indicating compromised chemical stability. Mechanistically, C. farmeri dissolved passive films through acid production (citric acid-mediated reactions), while P. aeruginosa accelerated electron transfer via conductive biofilms, establishing a positive feedback loop. The stratified biofilm structure—P. aeruginosa enriched in the outer layer and C. farmeri in the inner layer—induced oxygen concentration cells and diffusion limitations, exacerbating localized corrosion. This research clarifies the synergistic microbial corrosion mechanisms of Ti-Zr alloys and provides crucial theoretical foundations for designing microbial corrosion-resistant materials in marine engineering, such as optimizing alloy compositions to enhance passive film stability or developing strategies to disrupt biofilm stratification.

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Ti30ZrAlV合金的微生物协同腐蚀：酸溶-电子传递耦合机制

随着海洋工程装备向深海作业方向发展，钛锆（Ti-Zr）合金面临的微生物腐蚀威胁日益突出。然而，材料在多物种协同作用下的变质机制尚不清楚。本研究通过模拟海洋微生物环境，系统研究了Ti30ZrAlV （T30ZAV）合金在铜绿假单胞菌（P. aeruginosa）和C. farmeri共培养体系中的腐蚀行为及其协同作用机制。通过电化学测量（OCP、LPR、EIS、Tafel极化曲线）、表面形貌分析（SEM、CLSM）和腐蚀产物表征（XPS），揭示了一种协同的“酸溶-电子转移”机制，该机制可以在混合微生物环境中分解钝化膜。结果表明，T30ZAV合金在混合培养条件下的腐蚀电流密度（icorr）达到22.2 μA·cm - 2，比非生物条件下的腐蚀电流密度（3.6 μA·cm - 2）高6倍，显著超过单一培养条件下的腐蚀电流密度（P. aeruginosa: 8.7 μA·cm - 2； C. farmeri: 11.4 μA·cm - 2）。双种体系的最大坑深为2.037 μm，是非生物条件下（0.921 μm）的近两倍。XPS分析证实，钝化膜（TiO2-ZrO2）被严重降解，Ti4+和Zr4+峰强度降低，Ti3+和金属Ti/Zr信号增强，表明化学稳定性受损。在机制上，C. farmeri通过产酸（柠檬酸介导的反应）溶解了钝化膜，而P. aeruginosa通过导电生物膜加速了电子转移，建立了正反馈回路。分层生物膜结构- p。铜绿假单胞菌在外层富集，法氏弧菌在内层富集，引起氧浓度细胞和扩散限制，加剧局部腐蚀。该研究阐明了Ti-Zr合金的协同微生物腐蚀机制，为海洋工程中设计抗微生物腐蚀材料提供了重要的理论基础，如优化合金成分以提高被动膜稳定性或制定破坏生物膜分层的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

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