The interaction mechanism of titanium alloy TC4 between passive film and sulfate reducing bacteria biofilm in marine environment

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-02-03 DOI:10.1016/j.apsusc.2025.162620

Ningbo Li , Liting Wang , Zhihao Zhou , Xuzhou Jiang , Hongying Yu , Dongbai Sun

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Abstract

In marine environment, the surface of titanium alloys typically forms a composite film consisting of passive film and biofilm, which affects the service performance. However, the interaction mechanism between passive film and biofilm is not well understood. In this study, the interaction between passive film and Sulfate Reducing Bacteria (SRB) biofilm on the surface of titanium alloy TC4 in marine environment is investigated by immersion in an artificial seawater-based culture medium with SRB. The SRB biofilm on the surface of titanium alloy TC4 is in a dynamic evolution, and gradually increases from 1.16 % at 1 day to 47.76 % at 7 days and decreases to 22.62 % at 14 days, which alters the contact process between the corrosive medium and titanium alloy TC4. On the other hand, the metabolic activities of SRB biofilm, through the depolarization of the cathode, promote the occurrence of the anodic reactions, which change the composition and structure of the passive film and promote the change of the relative content of TiO₂, thereby affecting the corrosion rate of titanium alloy TC4. These results provide a valuable reference for the biofouling and corrosion prevention strategy of titanium alloy TC4 in marine service.

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海洋环境中被动膜与硫酸盐还原菌生物膜之间钛合金 TC4 的相互作用机制

在海洋环境中，钛合金表面通常形成由钝化膜和生物膜组成的复合膜，影响了钛合金的使用性能。然而，被动式膜与生物膜之间的相互作用机制尚不清楚。本研究通过浸泡在含硫酸盐还原菌（SRB）的人工海水培养基中，研究了海洋环境中钛合金TC4表面钝化膜与SRB生物膜的相互作用。钛合金TC4表面的SRB生物膜呈动态演化趋势，从1 d时的1.16 %逐渐增大到7 d时的47.76 %，到14 d时逐渐减小到22.62 %，改变了腐蚀介质与钛合金TC4的接触过程。另一方面，SRB生物膜的代谢活动通过阴极的去极化，促进阳极反应的发生，阳极反应改变了钝化膜的组成和结构，促进了TiO2相对含量的变化，从而影响了钛合金TC4的腐蚀速率。研究结果为TC4钛合金在海洋中的生物防污和防腐策略提供了有价值的参考。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.