Allylphenoxypiperidinium halides as corrosion inhibitors of carbon steel and biocides

Authors: GUNAY MEHDIYEVA MUZAKIR, MUSA BAIRAMOV RZA, SHAHNAZ HOSSEINZADEH BAHADOR, GULNARA HASANOVA MUSA

Abstract: A series of 1-(4-(2-allylphenoxy)butyl)piperidin-1-ium halides (4a-d) was synthesized and characterized via spectroscopic methods (FTIR, $^{1}$H NMR). The corrosion inhibition of the synthesized halides on carbon steel in water-salt-hydrocarbon environment, saturated with H$_{2}$S, was investigated. For this purpose, a series of techniques such as gravimetric measurement, potentiodynamic polarisation, and scanning electron microscope (SEM) were used and some thermodynamic parameters of corrosion process ($\Delta G_{ads.}$, $\Delta H^{0}_{ads.}$, $\Delta S^{0}_{ads.})$ were evaluated. The steel surface was checked by SEM, and the steel surface showed good surface coverage. The results showed that the synthesized compounds at the concentrations 125, 150 mg x L$^{-1}$ have corrosion inhibition activity of 78%-95% by gravimetric measurements and 8%-92% by potentiodynamic measurements at 100, 150 mg x L$^{-1}$. The biological activity was examined against sulphate-reducing bacteria (SRB). It was revealed that at the concentration of compounds 4c and 4d, 100 mg x L$^{-1}$, the antibacterial activity was 100%.

Keywords: Piperidinium halides, phenolic compounds, corrosion inhibitors, adsorption, biocides

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