Electrochemical behavior of Cu-10Al-10Zn alloy in seawater in the presence of cationic surfactants benzotriazole derivatives

Migahed, M. A.; Abdu, Ahmed Nasser; Elfeky, H.; EL-Rabiei, M.M.

doi:10.21608/ejchem.2019.13443.1834

Electrochemical behavior of Cu-10Al-10Zn alloy in seawater in the presence of cationic surfactants benzotriazole derivatives

Document Type : Original Article

Authors

¹ Egyptian Petroleum Research Institute, Nasr City 11727, Cairo, Egypt

² Department of basic science, High Institute for Engineering and Modern Technology, New-Elmarg, El-Qalyubia, Egypt

³ Chemistry Department, Faculty of Science, Fayoum University, Fayoum, Egypt

10.21608/ejchem.2019.13443.1834

Abstract

The behavior of Cu-10Al-10Zn alloy in seawater was studied in absence and presence of different concentrations of different surfactants (1-hexyl-5-methyl-1H-benzo[d][1,2,3]triazole-1- ium bromide (HBT(6)), 1-dodecyl-5-methyl-1H-benzo[d][1,2,3]triazole-1- ium bromide, (DBT(12)), and 1-octadecyl-5-methyl-1H-benzo[d][1,2,3]triazole-1- ium bromide, (OBT(18)) as corrosion inhibitors. These inhibitors were synthesized and their structures, (HBT) as a representative compound, were confirmed using 1HNMR and FTIR techniques. Conventional electrochemical techniques such as polarization methods and electrochemical impedance spectroscopy (EIS) were used. The inhibition efficiency increased by increasing the concentration of the prepared cationic surfactants in the medium. The curves of potentiodynamic polarization technique showed that, the performance of all prepared compounds act as mixed type. The standard free energy (〖∆G〗_ads^°) values indicate that the three prepared cationic surfactants adsorbed via physicochemical adsorption and obeyed to Langmuir adsorption model. AFM technique observed the decrease of surface roughness due to the protective film formed on Cu-10Al-10Zn alloy surface.

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