Influence of sulfate-reducing bacteria on the corrosion mechanism of Zn-Al-Al2O3 composite coatings in artificial seawater

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-04-24 DOI:10.1016/j.vacuum.2025.114358

Zhe Mao , Huan Wang , Chunxia Zhang , Bin Wang , Longxiang Liu

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Abstract

The impact of sulfate-reducing bacteria (SRB) on the corrosion behavior and mechanism of Zn-Al-Al₂O₃ composite coating has been studied in artificial seawater solutions. The Zn-Al-Al₂O₃ composite coating immersed in sterile artificial seawater solution is also tested for comparison. The Zn-Al-Al₂O₃ composite coating exhibits excellent corrosion resistance and the Zn phase as sacrificing cathodic is corroded first due to its more negative corrosion potential. Surface oxides including ZnO and Al₂O₃ play a significant role in initial-stage corrosion protection. The I_corr value increased from 4.623 μA/cm² to 8.428 μA/cm², indicating that the presence of SRB affects corrosion products, corrosion rate and corrosion behavior. The corrosion mechanism of the Zn-Al-Al₂O₃ composite coating in SRB-containing artificial seawater solution is deduced by a detailed analysis of scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XRD) and electrochemistry.

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硫酸盐还原菌对Zn-Al-Al2O3复合镀层在人工海水中腐蚀机理的影响

研究了硫酸盐还原菌（SRB）对Zn-Al-Al2O3复合镀层在人工海水溶液中的腐蚀行为及其机理的影响。将Zn-Al-Al2O3复合涂层浸泡在无菌人工海水溶液中进行对比试验。Zn- al - al2o3复合镀层表现出优异的耐蚀性，Zn相作为牺牲阴极，由于其更负的腐蚀电位，首先被腐蚀。表面氧化物包括ZnO和Al2O3在初始腐蚀保护中起重要作用。Icorr值从4.623 μA/cm2增加到8.428 μA/cm2，表明SRB的存在影响了腐蚀产物、腐蚀速率和腐蚀行为。通过扫描电子显微镜（SEM）、x射线光电子能谱（XRD）和电化学分析，推导了Zn-Al-Al2O3复合涂层在含srb的人工海水溶液中的腐蚀机理。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.