Corrosion of an AZ31B Magnesium Alloy by Sulfate-Reducing Prokaryotes in a Mudflat Environment.
Xiao Lan, Jie Zhang, Zaifeng Wang, Ruiyong Zhang, Wolfgang Sand, Liang Zhang, Jizhou Duan, Qingjun Zhu, Baorong Hou
Author Information
Xiao Lan: CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.
Jie Zhang: CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China. ORCID
Zaifeng Wang: Centre of Ocean Information Science and Technology, China National Offshore Oil Information Technology Co., Ltd., Beijing 100029, China.
Ruiyong Zhang: CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China. ORCID
Wolfgang Sand: Aquatic Biotechnology, University of Duisburg-Essen, 45141 Essen, Germany. ORCID
Liang Zhang: Centre of Ocean Information Science and Technology, China National Offshore Oil Information Technology Co., Ltd., Beijing 100029, China.
Jizhou Duan: CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China. ORCID
Qingjun Zhu: CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China. ORCID
Baorong Hou: CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.
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 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). The results show that a mudflat environment can lead to an accelerated corrosion of magnesium alloys.
