Allylphenoxypiperidinium halides as corrosion inhibitors of carbon steel and biocides

摘要

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%.