Multifunctional Inhibitor Mixture for Reducing Bacteria Growth and Corrosion on Marine Grade Steel

Abstract

<p><a></a>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 bacteria growth and corrosion. The combination of a newly synthesised compound, cetrimonium 4-hydroxycinnamate, 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 hours. </p> <p>The electrochemical data for the La+Cet mixture demonstrated the significant inhibition of both abiotic corrosion to a level similar to La(4OHCin)<sub>3</sub>, as well as the ability to reduce bacteria densities of single strains and a consortium. This is unlike the La+CetNal mixture which accelerated abiotic corrosion and the La+IMI which had an insignificant effect on microbial densities (Catubig et al. 2020). </p> <p>A compatible mixture of ionic inhibitors was achieved by using the same cinnamate anion. </p> <p>This mixture of Cet-4OHCin and La(4OHCin)<sub>3</sub> demonstrated significant abiotic corrosion inhibition and bacteria density reductions, making it a strong candidate as an MIC inhibitor system for 80HLES. </p> <p>The Cet-4OHCin compound and its mixture with La(4OHCin)<sub>3</sub> retained relatively low sensitivity towards skin and intestinal cells, making it a safer and more attractive alternative than other more hazardous corrosion inhibitor materials. </p>

Efficiency of a Novel Multifunctional Corrosion Inhibitor Against Biofilms Developed on Carbon Steel

“…In the present study, CTA-4OHcinn is considered environmentally sensible as a QAC, with a recent study confirming low LD 50 values and adsorption properties against human keratinocyte (skin) and duodenum (intestinal) cell lines (Catubig et al, 2021). The communication found the CTA-4OHcinn toxicity profile to be comparable to cetrimonium bromide; a safe and widely applied additive in cosmetic products and disinfectants (Catubig et al, 2021). Additionally, the multifunctional nature of CTA-4OHcinn eliminates the requirement to treat biofilm formation and corrosion with separate compounds.…”

“…QACs demonstrate low LD 50 values when compared against commercial biocides such as glutaraldehyde (Seter et al, 2013). In the present study, CTA-4OHcinn is considered environmentally sensible as a QAC, with a recent study confirming low LD 50 values and adsorption properties against human keratinocyte (skin) and duodenum (intestinal) cell lines (Catubig et al, 2021). The communication found the CTA-4OHcinn toxicity profile to be comparable to cetrimonium bromide; a safe and widely applied additive in cosmetic products and disinfectants (Catubig et al, 2021).…”

“…In the marine environment, a plethora of recent studies have investigated the attachment and biofilm formation of bacteria to engineered systems, since progression of the biofilm results in biofouling and microbiologically influenced corrosion (MIC) (Tuck et al, 2020;Albahri et al, 2021;Catubig et al, 2021;Qian et al, 2021;Tran et al, 2021). MIC is particularly costly, expected to contribute around 20-50% of the total $4T USD global corrosion costs (Little and Lee, 2007;Li et al, 2018).…”

Enhancing Biocide Efficacy: Targeting Extracellular DNA for Marine Biofilm Disruption

“…Quaternary ammonium salts are broadly applied as antimicrobial surfactants [19][20][21][22], with low toxicity when combined with the trans-4-hydroxy-cinnamate anion. Indeed, recent research demonstrates that the CTA-4OHcinn toxicity profile is reduced compared to cetrimonium bromide (CetBr), a common and safe antimicrobial additive in cosmetic products [23]. Established as an effective corrosion inhibitor and biocide [16,19,24], CTA-4OHcinn is a promising candidate for real-world applications.…”