Citation

Qi J, Xie F, Wang D, Zhao Y. Mater. Rep. (Chongqing) 2021; 35(7): 7169-7175.

Copyright

(Copyright © 2021, Editorial Office of Materials Reports)

DOI

10.11896/cldb.19120246

PMID

unavailable

Abstract

At present, high-strength pipeline steels such as X80 steel, which have been widely used in actual pipeline engineering, have begun to face corrosion hazards one by one with the burying time. Modern technologies such as magnetic flux leakage detection often used at construction sites will inevitably have residual magnetic fields after construction, combined with complex corrosion systems formed by factors such as microorganisms and corrosive ions in the soil. Microbes and magnetic fields, as common corrosion factors in construction sites, have varying degrees of influence on the corrosion behavior of pipelines. The corrosion mechanism and degree of different types of bacteria on buried pipeline steels in the soil are different. The two most common microorganisms are aerobic bacteria iron bacteria (IOB) and anaerobic bacteria sulfate-reducing bacteria (SRB). While the current research on the corrosion mechanism of IOB tends to be consistent, the corrosion mechanism of SRB has many assumptions. Techniques such as artificial magnetic fields and magnetic flux leakage detection have become the products of the new era, but there are few related researches on magnetic fields in engineering practice, and the research on the coexistence of magnetic fields and microorganisms is still in its infancy. The corrosion behavior of steel by SRB and IOB through a large number of experiments has been studied, which confirmed the hypothesis that microorganisms accelerate metal corrosion. At the same time, when SRB and IOB coexist, the two promote each other to further aggravate metal corrosion. The magnetic field not only unilaterally affects metal corrosion, but also inhibits the activity of microorganisms in the presence of microorganisms. However, within a certain range of magnetic fields, the biofilm or characteristics of the steel surface, in turn, play a role in inhibiting corrosion. It can be seen from the comprehensive research that the corrosion system in the presence of magnetic fields and microorganisms is extremely complicated. It is necessary to summarize the existing results and look forward to the research prospects in this field. This paper summarizes the mechanisms of two major microorganisms, namely anaerobic sulfate-reducing bacteria (SRB), aerobic iron bacteria (IOB), and magnetic fields, on the corrosion of metals, and summarizes the academic research on the synergistic effect of magnetic fields and sulfate-reducing bacteria The status quo is analyzed, and the controversial issues and deficiencies in the existing research are analyzed, and new ideas are proposed for future research in this field. © 2021, Materials Review

Keywords: Pipeline transportation

Language: en

Keywords

Pipeline corrosion; Pipelines; Steel corrosion; Steel pipe; Aerobic bacteria; Corrosion inhibitors; Corrosive effects; Fiber optic sensors; High strength steel; Iron; Iron research; Magnetic fields; Magnetic leakage; Sulfur compounds; Underground corrosion