Journal
CORROSION SCIENCE
Volume 178, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.109057
Keywords
Microbiologically influenced corrosion; Stainless steels; Scanning electrochemical microscopy
Funding
- China Postdoctoral Science Foundation [2019M660453]
- Fundamental Research Funds for the Central Universities [FRF-TP-19-081A1]
- Postdoctor Research Foundation of Shunde Graduate School of University of Science and Technology Beijing [2020BH009]
- 111 Project [B17003]
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The study found that under microbiologically influenced corrosion, catalase accelerated the cathodic process of stainless steel corrosion, leading to more severe corrosion. However, under sterile conditions, the concentration of catalase had no effect on the corrosion of stainless steel.
The role of metabolic catalase in microbiologically influenced corrosion (MIC) of 304 stainless steel by Natronorubrum tibetense was investigated. Under sterile condition, the catalase concentration in the culture medium had no effect on the corrosion of stainless steel. In contrast, the addition of catalase in the inoculated culture medium resulted in more severe pitting corrosion of stainless steel. The potentiodynamic polarization results demonstrated that catalase mainly promoted the cathodic process of MIC of the stainless steel. Scanning electrochemical microscopy (SECM) further confirmed the accelerating effect of catalase on the cathodic oxygen reduction reaction of MIC.
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