Inhibition of mild steel corrosion in groundwater by pyrrole and thienylcarbonyl benzotriazoles |
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| Authors: | D Gopi K M Govindaraju V Collins Arun Prakash V Manivannan L Kavitha |
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| Affiliation: | (1) Department of Chemistry, Periyar University, Salem, 636 011, Tamilnadu, India;(2) Department of Physics, Periyar University, Salem, 636 011, Tamilnadu, India |
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| Abstract: | The inhibition efficiency of Zn2+, 3-phosphonopropionic acid (3-PPA), benzotriazole (BTA) and two synthesized benzotriazole derivatives namely 1-(2-pyrrole
carbonyl) benzotriazole (PCBT) and 1-(2-thienylcarbonyl) benzotriazole (TCBT) were evaluated as inhibitors for the corrosion
of mild steel in ground water. The inhibition efficiencies of PCBT and TCBT in combination with Zn2+ and 3-PPA were also investigated and the results were compared with BTA. In order to study the corrosion rate and inhibition
efficiency we employed potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Further characterization
using Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) demonstrates the adsorption of inhibitor
and the formation of corrosion products on the mild steel surface, respectively. Combination of PCBT along with Zn2+ and 3-PPA shows better corrosion inhibition efficiency than other inhibitor combinations and the individual inhibitors. |
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| Keywords: | Corrosion Mild steel Inhibition Potentiodynamic polarization Impedance Benzotriazole |
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