Abstract
The effect of rosuvastatin drug on the corrosion behavior of mild steel in 1.0 M HCl and 0.5 M H2SO4 solutions was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and Fourier transform infrared (FTIR) techniques. The inhibition efficiency (IE) was found to increase with increasing rosuvastatin concentration up to 600 ppm and then it was decreased. The maximum inhibition efficiency of 92% has been achieved at 600 ppm rosuvastatin concentration in both HCl and H2SO4 solutions. The effect of temperature on the rate of corrosion in the absence and presence of drug was also studied. Some thermodynamic parameters were computed from the effect of temperature on corrosion and inhibition processes. Adsorption of the drug was found to obey Langmuir adsorption isotherm. Potentiodynamic polarization measurements indicated that the inhibitor were of mixed type. The inhibition efficiency values obtained from potentiodynamic polarization showed a reasonable agreement with those arising from EIS measurements.
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