Corrosion of an AZ31B Magnesium Alloy by Sulfate-Reducing Prokaryotes in a Mudflat Environment

Microorganisms

Wolfgang Sand¹  Xiao Lan²  Jie Zhang²  Jizhou Duan²  Ruiyong Zhang²  Baorong Hou²  Qingjun Zhu²  Zaifeng Wang³  Liang Zhang³ 

[1] Aquatic Biotechnology, University of Duisburg-Essen, 45141 Essen, Germany;CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Centre of Ocean Information Science and Technology, China National Offshore Oil Information Technology Co., Ltd., Beijing 100029, China;

关键词: sulfate–reducing prokaryotes;    mudflat environment;    magnesium alloy;    Microbiologically Influenced Corrosion;    electrochemical impedance spectroscopy;   

DOI  :  10.3390/microorganisms10050839

来源: DOAJ

【 摘 要 】

To study the abnormal failure of magnesium anodes for buried pipelines in marine engineering in the unique environment of mudflats, a strain of a sulfate–reducing prokaryote (SRP) was isolated from pipe–laying soil, and identified as Desulfovibrio sp. HQM3. Weight–loss test, electrochemical measurements, SEM, EDS, XRD, and CLSM techniques were used to study the effect of corrosion on the AZ31B magnesium alloy. Under the influence of SRP, the magnesium alloy corroded severely at rates up to 1.31 mm/year in the mudflat environment. SRP accelerated corrosion by 0.3mm/year. Pitting occurred on the samples in both abiotic and biotic systems. The pitting depth reached 163.47 μm in the biotic system after 14 days. The main composition of a petal–like corrosion product was Mg(OH)₂. The results show that a mudflat environment can lead to an accelerated corrosion of magnesium alloys.

【 授权许可】

Unknown