Inhibitor mixture for reducing bacteria growth and corrosion on marine steel†
Rainier A. Catubig A , Agnes Michalczyk B , Wayne C. Neil C , Grant McAdam C , John Forsyth A B , Mahdi Ghorbani A , Ruhamah Yunis A , M. Leigh Ackland B , Maria Forsyth A and Anthony E. Somers
A *
A Institute for Frontier Materials, Deakin University, Burwood, Vic. 3125, Australia.
B Life and Environmental Sciences, Deakin University, Burwood, Vic. 3125, Australia.
C Defence Science and Technology Group, Fishermans Bend, Vic. 3207, Australia.
Australian Journal of Chemistry 75(9) 619-630 https://doi.org/10.1071/CH21266
Submitted: 11 October 2021 Accepted: 17 January 2022 Published: 15 March 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
High strength steel in marine environments suffers from severe corrosion susceptibility and the presence of bacteria can exacerbate the effect, accelerating degradation via microbiologically influenced corrosion (MIC). Here we propose a novel approach to MIC inhibition by designing a system capable of limiting the effects of both bacterial growth and corrosion. The combination of a newly synthesised compound, cetrimonium 4-hydroxycinnamate (Cet-4OHCin), with lanthanum 4-hydroxycinnamate was the only system tested to date that could both inhibit abiotic corrosion in artificial seawater and minimise bacteria consortium densities over an exposure period of 24 h. This success was proposed to be due to them having the same anion, making them stable when mixed in the solution of the test environment. Furthermore, we confirmed from cytotoxicity testing that Cet-4OHCin demonstrated similarly limited toxicity towards human cells as the commercially available cetrimonium bromide, a known safe additive to cosmetic products. This new system shows promise as a safe and effective multifunctional inhibitor mixture to reduce the effects of MIC.
Keywords: anti-microbial, corrosion, inhibitor, microbiologically influenced corrosion, profilometry, rare-earth, seawater, steel.
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