Abstract
The influence of dissolved oxygen concentration (DOC) on the microbiologically influenced corrosion (MIC) of Q235 carbon steel in the culture medium of halophilic archaeon Natronorubrum tibetense was investigated. The increase of DOC from 0.0 to 3.0 ppm was found to strengthen the oxygen concentration cell by promoting cathodic reaction. Meanwhile, the increased DOC also promoted archaeal cell growth, which could consume more metallic iron as energy source and aggravated the localized corrosion. When the DOC further increased to 5.0 ppm, the uniform corrosion was dominant as the biofilms became uniformly presented on the steel surface. Combined with the stronger inhibition effect of oxygen diffusion by the increased biofilm coverage, the MIC of carbon steel in the 5.0 ppm medium was weaker than that in the 3.0 ppm medium. From weight loss and electrochemical tests, the results all demonstrated that the carbon steel in the 3.0 ppm medium had the largest corrosion rate.
Highlights
Influenced corrosion (MIC) is mainly caused by the formation of biofilm on metal surface
Organic substances in the culture medium are consumed by microbial cells as electron donors, and dissolved oxygen is used as electron acceptor to sustain cell respiration
At the same time, dissolved oxygen functions as the cathode depolarizer that affects the electrochemical corrosion process on metal/medium interface, and its uneven distribution leads to the generation of oxygen concentration cell, which is considered to be the main reason for the formation of localized corrosion (Little and Lee, 2014)
Summary
Influenced corrosion (MIC) is mainly caused by the formation of biofilm on metal surface. For the ubiquitous microorganisms in the natural environment, such as SRB, their MIC mechanisms have been studied in-depth, and comprehensive corrosion mechanisms have been well established (Venzlaff et al, 2013; Rajala et al, 2015; Li et al, 2018; Jia et al, 2019). Some researches on MIC have investigated eukaryotic microorganisms in humid atmospheric environment (Qu et al, 2015; Pramila and Ramesh, 2017)
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