The effect of Desulfovibrio caledoniensis and Pseudomonas aeruginosa on the corrosion behaviour of 70Cu-30Ni alloy

Li-Jun He; Zheng-Hui Qiu; Shao-Xia Ma; Rong-Chang Zeng; Cun-Guo Lin

doi:10.1080/08927014.2024.2435023

The effect of Desulfovibrio caledoniensis and Pseudomonas aeruginosa on the corrosion behaviour of 70Cu-30Ni alloy

Biofouling. 2024 Dec 3:1-17. doi: 10.1080/08927014.2024.2435023. Online ahead of print.

Authors

Li-Jun He^{1

2}, Zheng-Hui Qiu², Shao-Xia Ma¹, Rong-Chang Zeng¹, Cun-Guo Lin²

Affiliations

¹ College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, China.
² National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, China.

PMID: 39625172
DOI: 10.1080/08927014.2024.2435023

Abstract

This work investigated the effect of Desulfovibrio caledoniensis (D. caledoniensis) and Pseudomonas aeruginosa (P. aeruginosa) on the microbiologically influenced corrosion (MIC) behaviour of 70Cu-30Ni alloy using surface analysis and electrochemical techniques. The results demonstrated that the mixed medium containing D. caledoniensis and P. aeruginosa further accelerated the MIC of 70Cu-30Ni alloy compared to the single species medium. The addition of exogenous pyocyanin (PYO) to the D. caledoniensis medium increased the maximum pit depth on 70Cu-30Ni alloy from 5.40 μm to 6.59 μm, and the corrosion current density (i_corr) increased by one order of magnitude. From the perspective of bioenergetics and extracellular electron transfer (EET), the comprehensive MIC mechanism of 70Cu-30Ni alloy induced by D. caledoniensis and P. aeruginosa was proposed.

Keywords: 70Cu-30Ni alloy; Desulfovibrio caledoniensis; Microbiologically influenced corrosion; Pseudomonas aeruginosa.