Chamomile extract (CE) was tested as corrosion inhibitor for C38 steel in 1 M HCl using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM) studies. The effect of temperature on the corrosion behavior of C38 steel in 1 M HCl with addition of plant extracts was studied in the temperature range of 298–328 K. Inhibition efficiency of 88% was achieved with 7g/L CE at 298 K. It is evident from the results of this study that CE inhibits the corrosion in 1 M HCl through adsorption process following Langmuir adsorption isotherm. The protection efficiency increased with increase in inhibitor concentration but decreases with temperatures. The Nyquist plots showed that on increasing CE concentration, increases charge transfer resistance and decreases double layer capacitance. The mixed mode of action exhibited by the inhibitor was confirmed by the polarization studies while SEM analysis substantiated the formation of protective layer over the C38steel surface. The values of inhibition efficiency obtained from different techniques measurements are in good agreement.
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