期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2015
卷号：6
期号：11
页码：3034-3044
出版社：University of Mohammed Premier Oujda
摘要：The inhibition effect of benzothiazine (3,4-dihydro-2H-1,4-benzothiazine-3-thione ): P 1 in mild steel corrosion in 1M HCL acid was investigated by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The result showed that corrosion rate was significantly decreased in presence of the inhibitor. The inhibiting action increases with the concentration of benzothiazine compound to attain 92 % at 10 -3 mol/L. The increase in temperature lead s to a decrease in the inhibition efficiency of the compounds in the temperature range 3 13-343K. Adsorption of benzothiazine P 1 on the mild steel surface in 1M HCL solution obeyed the Langmuir adsorption isotherm. Attempt to correlate the molecular structure to quantum chemical indices was made using density functional theory (DFT). EIS measurements sho wed an increase in charge transfer resistance (R ct ) with concentration. Potentiodynamic polarization stud y showed that the inhibitor act as mixed type, controlling both the anodic and cathodic reactions
关键词：Benzothiazine; mild steel; Corrosion; inhibition effi ciency; EIS
