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

International Journal of Mining Science and Technology

A.H. Kaksonen¹  C. Morris¹  O. Kimyon²  M. Manefield²  H. Chen³  A. Crosky³  H. Lamei Ramandi⁴  S. Saydam⁴ 

[1] CSIRO Land and Water, Floreat, WA 6014, Australia;School of Chemical Engineering, UNSW Sydney, NSW 2052, Australia;School of Materials Science and Engineering, UNSW Sydney, NSW 2052, Australia;School of Minerals and Energy Resources Engineering, UNSW Sydney, NSW 2052, Australia;

关键词: Cable bolt failure;    Microbiologically influenced corrosion;    Acidithiobacillus ferrooxidans;   

DOI  :  

来源: DOAJ

【 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 initiate 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. ferrooxidans 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 creating initiation points for other catastrophic failures such as stress corrosion cracking.

【 授权许可】

Unknown