Fungal corrosion behavior and mechanism of deposit-covered aluminum alloy 7075 in marine environment

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2025-05-01 DOI:10.1016/S1003-6326(24)66757-9

Jia-ping WANG , Yi ZHANG , Hong-wei LIU , Yan-sheng YIN

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Abstract

The corrosion behavior of deposit-covered aluminum alloy 7075 (AA7075) caused by fungus Aspergillus terreus (A. terreus) was thoroughly investigated in artificial seawater aiming to offer some new insights into the under-deposit corrosion mechanism of aluminum alloys in marine environments containing fungi. Electrochemical impedance spectroscopy, polarization curves, wire beam electrodes, and surface analysis were performed. Results indicate that A. terreus can survive beneath the deposit but the counts of sessile spores decline as the increase of deposit thickness, suggesting a poor biological activity of A. terreus beneath the deposit. Both the uniform corrosion and pitting corrosion are accelerated by A. terreus, while the pitting corrosion of AA7075 alloys beneath the deposit derives from a galvanic cell with a small anode and a large cathode. Deposits have a corrosion inhibition effect on AA7075. However, the galvanic effect caused by the bare and deposit-covered AA specimens is obviously enhanced by A. terreus.

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沉积覆层铝合金7075在海洋环境中的真菌腐蚀行为及机理

在人工海水环境中，深入研究了真菌土曲霉（Aspergillus terreus， A. terreus）对沉积覆盖铝合金7075 （AA7075）的腐蚀行为，以期对含真菌海洋环境中铝合金沉积下腐蚀机理提供一些新的认识。进行了电化学阻抗谱、极化曲线、线束电极和表面分析。结果表明，土霉在沉积物下可以存活，但随着沉积物厚度的增加，无根孢子的数量减少，表明土霉在沉积物下的生物活性较差。均匀腐蚀和点蚀都是由a . terreus加速的，而沉积层下AA7075合金的点蚀是由小阳极大阴极的原电池引起的。沉积物对AA7075具有缓蚀作用。而陆生藤则明显增强了裸露和被沉积物覆盖的AA标本的电偶效应。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.