Shariat Amir Hosein, Moghimi Hamid, Giyahchi Minoo, Ebrahim-Habibi Mohammad-Bagher, Tirandaz Hassan
Department of Microbiology, School of Biology, College of Science, University of Tehran, Tehran, Iran.
Microbiology and Biotechnology Research Group, Research Institute of Petroleum Industry, Tehran, Iran.
Sci Rep. 2024 Aug 17;14(1):19096. doi: 10.1038/s41598-024-70150-x.
Amorphotheca resinae is a fungus that particularly corrodes aeronautical aluminum alloys, leading to economic issues in various industries. This study aims to investigate the effects of this fungus on the corrosion of four different aluminum alloys, namely 2024, 7075, 5083, and 3105, after 25, 50, and 75 days through scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM), 3D profilometry, weight loss (%) measurement, energy dispersive spectrometry (EDS), electrochemical impedance (EIS), and pH changes. After 25 days, the 2024 alloy had the highest mycocorrosion rate (1.3417 mpy), while alloy 3105 had an undetectable value on this day. According to the EIS test, the 3105 alloy had the highest level of resistance (1.12 × 10 Ω cm) to corrosion, while the 2024 alloy was the most susceptible (7138 Ω cm). The qualitative data from SEM, CLSM, and 3D profilometry also confirmed the quantitative findings where the surface pits on the 2024 alloy were deeper than those of other alloys. Overall, the results showed that the lowest and highest corrosion rates mediated by A. resinae belonged to 3105 and 2024 alloys, respectively. These findings could have significant implications for industries that use aluminum alloys and might help in developing strategies to prevent or control biocorrosion.
树脂变色曲霉是一种特别会腐蚀航空铝合金的真菌，会给各个行业带来经济问题。本研究旨在通过扫描电子显微镜（SEM）、共聚焦激光扫描显微镜（CLSM）、三维轮廓测量法、失重（%）测量、能量色散光谱（EDS）、电化学阻抗（EIS）和pH值变化，研究这种真菌在25天、50天和75天后对四种不同铝合金（即2024、7075、5083和3105）腐蚀的影响。25天后，2024合金的真菌腐蚀速率最高（1.3417密耳/年），而3105合金在这一天的腐蚀速率值无法检测到。根据EIS测试，3105合金对腐蚀的抗性最高（1.12×10Ω·cm），而2024合金最易腐蚀（7138Ω·cm）。SEM、CLSM和三维轮廓测量法的定性数据也证实了定量研究结果，即2024合金表面的凹坑比其他合金更深。总体而言，结果表明，树脂变色曲霉介导的最低和最高腐蚀速率分别属于3105合金和2024合金。这些发现可能对使用铝合金的行业具有重大意义，并可能有助于制定预防或控制生物腐蚀的策略。
