Abstract
The inhibitory effect of the crude ethyl acetate extract of Saccocalyx satureioides was estimated on the corrosion of carbon steel (X52) in 1 M HCl solution sing weight loss measurement, potentiodynamic polarization, electrochemical impedance spectroscopy and scanning electron microscopy techniques. Potentiodynamic polarization curves indicated that the plants extract behaves as a mixed-type inhibitor. The adsorption of the inhibitor on the carbon steel surface was found to follow Freundlich adsorption isotherm. The free energies, enthalpies and entropies for the adsorption and dissolution process were discussed in details. The inhibiting action increases with increasing concentration of the extract. The results obtained show that the extract of the aerial parts of Saccocalyx satureioides could serve as an effective corrosion inhibitor of carbon steel (X52) in hydrochloric acid medium.
Highlights
Metals and alloys are frequently used in industrial applications due to their convenience and low cost
The inhibitory effect of the crude ethyl acetate extract of Saccocalyx satureioides was estimated on the corrosion of carbon steel (X52) in 1 M HCl solution sing weight loss measurement, potentiodynamic polarization, electrochemical impedance spectroscopy and scanning electron microscopy techniques
We describe the testing of ethyl acetate extract parts S. satureioides as corrosion inhibitor for carbon steel (X52) in HCl solution, using weight loss and electrochemical techniques, such as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS)
Summary
Metals and alloys are frequently used in industrial applications due to their convenience and low cost. We describe the testing of ethyl acetate extract parts S. satureioides as corrosion inhibitor for carbon steel (X52) in HCl solution, using weight loss and electrochemical techniques, such as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Coupons of carbon steel (X52) with dimensions 1.0 9 0.8 9 0.4 cm were used for weight loss measurements. The coupons were abraded with different grade of emery papers, (600, 800, 1200 and 2000), degreased with acetone and rinsed with distillated water, before its immersion in 1 M HCl with and without the addition of different concentrations of Saccocalyx satureioides ethyl acetate extract (SSE). Ð3Þ where h the surface coverage, Cr0 and Cri are the corrosion rates of the carbon steel (X52) coupons in absence and presence of inhibitor, respectively.
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