Microbiologically influenced corrosion of cable bolts in underground coal mines:The effect of Acidithiobacillus ferrooxidans

• 作者: H.Chen O.Kimyon H.Lamei Ramandi M.Manefield A.H.Kaksonen C.Morris A.Crosky S.Saydam
• 来源期刊: 矿业科学技术学报（英文版）
• 年，卷（期）: 2021,（3）
• 页码范围: 357-363
• 页数: 7页
• 语种: 英文
• DOI: 10.3969/j.issn.2095-2686.2021.03.002

摘要

Reports on corrosion failure of cable bolts, used in mining and civil industries, have been increasing in the past two decades. The previous studies found that pitting corrosion on the surface of a cable bolt can ini-tiate premature failure of the bolt. In this study, the role of Acidithiobacillus ferrooxidans (A. ferrooxidans) bacterium in the occurrence of pitting corrosion in cable bolts was studied. Stressed coupons, made from the wires of cable bolts, were immersed in testing bottles containing groundwater collected from an underground coal mine and a mixture of A. ferrooxidans and geomaterials. It was observed that A. ferroox-idans caused pitting corrosion on the surface of cable bolts in the near-neutral environment. The presence of geomaterials slightly affected the pH of the environment; however, it did not have any significant influence on the corrosion activity of A. ferrooxidans. This study suggests that the common bacterium A. ferrooxidans found in many underground environments can be a threat to cable bolts' integrity by cre-ating initiation points for other catastrophic failures such as stress corrosion cracking.