Journal article
Preliminary study of microbiologically influenced corrosion by Pseudomonas aeruginosa on high Chromium white iron
PLoS One, Vol.19(8), pp.1-21
2024
PMID: 39163379
Abstract
Microbiologically Influenced Corrosion (MIC) poses a significant challenge to various industries, leading to substantial economic losses and potential safety hazards. Despite extensive research on the MIC resistance of various materials, there is a lack of studies focusing on High Chromium White Iron (HCWI) alloys, which are widely used in wear-resistant applications. This study addresses this knowledge gap by providing a comprehensive investigation of the MIC resistance of three HCWI alloys with varying chromium contents (22 wt%, 30.7 wt%, and 21 wt%) in the presence of Pseudomonas aeruginosa (P. Aeruginosa), a common bacterial species associated with MIC. The alloys were exposed to an artificial seawater medium inoculated with P.Aeruginosa for 14 days, and their corrosion behaviour was evaluated using electrochemical techniques, surface analysis, and microscopy. Electrochemical Impedance Spectroscopy (EIS) results revealed that the alloy with the highest chromium content (A2, 30.7 wt% Cr) exhibited superior MIC resistance compared to the other alloys (A1, 22 wt% Cr and M1, 21 wt% Cr). The enhanced performance of alloy A2 was attributed to the formation of a more stable and protective passive film, as well as the development of a more compact and less permeable biofilm. The EIS data, interpreted using equivalent circuit models, showed that alloy A2 had the highest charge transfer resistance and the lowest biofilm capacitance, indicating a more effective barrier against corrosive species. Bode plots further confirmed the superior corrosion resistance of alloy A2, with higher impedance values and phase angles at low frequencies compared to alloys A1 and M1. Scanning Electron Microscopy (SEM) and optical microscopy analyses corroborated these findings, showing that alloy A2 had the lowest pit density and size after 14 days of exposure. The insights gained from this study highlight the critical role of chromium content in the MIC resistance of HCWI alloys and have significant implications for the design and selection of materials for applications prone to microbial corrosion.
Details
- Title
- Preliminary study of microbiologically influenced corrosion by Pseudomonas aeruginosa on high Chromium white iron
- Authors
- Cedric Tan (Corresponding Author) - Charles Darwin UniversityNaveen Elumalai (Corresponding Author) - Charles Darwin UniversityKannoorpatti Krishnan (Author) - Charles Darwin University
- Publication details
- PLoS One, Vol.19(8), pp.1-21
- Publisher
- Public Library Science
- Date published
- 2024
- DOI
- 10.1371/journal.pone.0306164
- ISSN
- 1932-6203
- PMID
- 39163379
- Copyright note
- © 2024 Tan et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
- Data Availability
- All relevant data are within the paper and its Supporting information.
- Organisation Unit
- School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 991216649702621
- Output Type
- Journal article
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