Protection of petroleum equipments against corrosion and bacterial growth using novel quaternary amine inhibitors

Abstract

In this study, three Schiff’s base compounds were prepared from the reaction of o-phenylenediamine, p-phenylenediamine, and 2-aminobenzoimidazole with acetophenone. The obtained Schiff’s bases were quaternized using dimethyl sulfate to obtain three quaternary ammonium salts designated as AH4, AH5, and AH6. The newly synthesized quaternary ammonium salts were evaluated as corrosion inhibitors for protection of carbon steel in 1 N H2SO4 using different electrochemical methods, including potentiodynamic polarization and electrochemical impedance measurements at 25 oC.The adsorption of the inhibitors was obeyed Langmuir adsorption isotherm. The inhibitors were behaved as mixed type inhibitors according to their Gads values which were in the range of physicochemical adsorption values. The maximum inhibition efficiency was obtained using compound AH6 at concentration of 400 ppm to result an efficiency of 92.3%.