硫酸盐还原菌的无机代谢产物对AZ31B和AZ63B镁合金在3.5 wt.%氯化钠溶液中的腐蚀作用

Effects of Inorganic Metabolites of Sulphate-Reducing Bacteria on the Corrosion of AZ31B and AZ63B Magnesium Alloy in 3.5 wt.% NaCl Solution.

作者信息

Li Jinrong, Liu Xin, Zhang Jie, Zhang Ruiyong, Wang Mingxing, Sand Wolfgang, Duan Jizhou, Zhu Qingjun, Zhai Shenbao, Hou Baorong

机构信息

Key Laboratory of Marine Environmental Corrosion and Biofouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.

出版信息

Materials (Basel). 2022 Mar 17;15(6):2212. doi: 10.3390/ma15062212.

DOI:10.3390/ma15062212

PMID:35329663

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8953398/

Abstract

This study seeks prevent and alleviate the failure of magnesium alloy anodes in pipelines, which we suspect is a problem related to SRB. The electrochemical corrosion behaviour of two kinds of magnesium alloys, AZ31B and AZ63B, in 3.5 wt.% NaCl solution with sulphide or phosphide-the two main inorganic metabolites of sulphate-reducing bacteria-were studied by electrochemical tests combined with other characterisation methods such as scanning electron microscopy and X-ray diffraction. The results show that the corrosion film formed by inorganic metabolites of SRB's initial stage of corrosion (1-3 d) can lead to the corrosion of magnesium alloys. However, the loose and porous corrosion product film cannot protect the substrate effectively. The inorganic metabolites in the solution can accelerate the corrosion of the surface of magnesium alloy after the corrosion products have fallen off. This study provides a theoretical basis for alleviating the premature failure of magnesium alloy anodes and for corrosion protection in the future.

摘要

本研究旨在预防和减轻管道中镁合金阳极的失效，我们怀疑这是一个与硫酸盐还原菌（SRB）相关的问题。通过电化学测试结合扫描电子显微镜和X射线衍射等其他表征方法，研究了两种镁合金AZ31B和AZ63B在含有硫化物或磷化物（硫酸盐还原菌的两种主要无机代谢产物）的3.5 wt.% NaCl溶液中的电化学腐蚀行为。结果表明，SRB腐蚀初期（1 - 3天）的无机代谢产物形成的腐蚀膜会导致镁合金的腐蚀。然而，疏松多孔的腐蚀产物膜不能有效地保护基体。腐蚀产物脱落后，溶液中的无机代谢产物会加速镁合金表面的腐蚀。本研究为减轻镁合金阳极过早失效及未来的腐蚀防护提供了理论依据。