“…To effectively combat MIC, both microbial and abiotic corrosion effects need to be limited and we hypothesise that either a single, multifunctional inhibitor, or, more likely, a mixture of two inhibitors, is needed to eliminate bacteria growth and mitigate corrosion. Our previous work reported the mixture of lanthanum 4-hydroxycinnamate (La(4OHCin)3).and imidazolinium 4-hydroxycinnamate (IMI-4OHCin), referred to as La+IMI, provided more significant abiotic corrosion inhibition on the HY80 high strength steel in artificial seawater than La(4OHCin)3 tested separately (Catubig et al 2020).La(4OHCin)3 is known to inhibit corrosion to a similar level as sodium dichromate but at a quarter of the concentration, (Blin et al 2004).suggesting the La+IMI synergistically works together to provide a much more efficient corrosion inhibitor compared to sodium dichromate and La(4OHCin)3. In the current work, we exposed cultures of a single species of bacteria and a consortium of planktonic bacteria to the La+IMI mixture to verify the bactericidal properties of the inhibitors, in addition to their already confirmed abiotic corrosion properties.…”