Electrochemical investigation of the corrosion behavior of mild steel in 0.5 M phosphoric acid solution by Metoprolol tablet as a green inhibitor
کد مقاله : 1066-PHYSCHEM20
سیدمحمدعلی حسینی *، فاطمه محمدی نژاد1، مهدی شهیدی زندی2، محمدجواد بهرامی3
1دانشجوی دانشگاه شهید باهنر کرمان
2استاد/دانشگاه آزاد اسلامی کرمان
3اداری/دانشگاه فرهنگیان کرمان
چکیده مقاله:
The effect of metoprolol tablet as green inhibitor on the corrosion behavior of mild steel (st37) in 0.5 M phosphoric acid solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The inhibition efficiency was found to increase with increasing inhibitor concentration. Potentiodynamic polarization measurements indicated that corrosion current density decreased with increasing the inhibitor concentration. . The EIS measurements showed that by addition of the inhibitor up to a certain concentration, the charge transfer resistance increases and the double layer capacitance decreases. It was found that the investigated compounds exhibit a good inhibition effect especially at 50-400ppm range of concentration,which makes it commercially important. Polarization curves indicated that metoprolol tablet acts as a mixed type inhibitor. The adsorption of the inhibitor on the alloy surface in 0.5 M phosphoric acid solution followed the Langmuir isotherm. The results obtained from analysis of EIS data was in good agreement with those achieved by the polarization measurements.
کلیدواژه ها:
Metoprolol tablet, Electrochemical impedance spectroscopy (EIS),Potentiodynamic polarization,phosphoric acid
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