A preliminary investigation of corrosion inhibition of mild steel in 0.5 M H2SO4 by 2-amino-5-(n-pyridyl)-1,3,4-thiadiazole: Polarization, EIS and molecular dynamics simulations |
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Authors: | Yongming Tang Xiaoyuan Yang Rong Wan Xiaoshuang Yin |
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Affiliation: | a School of Science, Nanjing University of Technology, Nanjing 210009, PR China b School of Environmental and Safety Engineering, Jiangsu Polytechnic University, Changzhou 213164, PR China |
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Abstract: | The efficiency, as steel corrosion inhibitors in 0.5 M H2SO4, of two thiadiazole derivatives, 2-amino-5-(3-pyridyl)-1,3,4-thiadiazole (3-APTD) and 2-amino-5-(4-pyridyl)-1,3,4-thiadiazole (4-APTD), was investigated by polarization and electrochemical impedance spectroscopy. The protection efficiency increases with increasing inhibitors concentration, but the temperature has hardly effect on the inhibition efficiency of APTD. The adsorption of APTD on iron surface obeys the Langmuir isotherm. The experimental results show that the inhibition efficiency of 4-APTD is higher than that of 3-APTD, and the molecular dynamics (MD) simulations show that the adsorption of 4-APTD on iron surface has the higher binding energy than that of 3-APTD. |
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Keywords: | A Acid solutions A Mild steel B EIS B Modelling studies B Polarization C Acid inhibition |
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