Rothmannia longiflora extract as corrosion inhibitor for mild steel in acidic media

International Journal of Industrial Chemistry

دوره 6، شماره 4، بهمن 2015، صفحه 273-284

نوع مقاله: research article

شناسه دیجیتال (DOI): https://doi.org/10.1007/s40090-015-0050-z

نویسندگان

Chris O. Akalezi^{* 1}؛ Emeka E Oguzie²؛ Cynthia E. Ogukwe¹؛ Everest A. EJele³

¹Electrochemical and Material Science Unit (EMRU), Department of Chemistry, Federal University of Technology Owerri, PMB 1526, Owerri, Nigeria

²Electrochemical and Material Science Unit (EMRU), Department of Chemistry, Federal University of Technology, Owerri, Imo State, PMB 1526, Nigeria

³Department of Chemistry, Federal University of Technology, PMB 1526, Owerri, Nigeria

چکیده

Background
The inhibitive effect of the aqueous extract of Rothmannia longiflora (RL) on the corrosion of mild steel in 1 M HCl and 0.5 M H₂SO₄ solutions was investigated by weight loss measurement as well as potentiodynamic polarization and electrochemical impedance spectroscopy measurements.
Result
The extract was found to efficiently inhibit the corrosion process in both environments and inhibition efficiency increased with increasing extract concentration as well as rise in temperature. Data from electrochemical measurements suggest that the extract functioned by adsorption of the organic matter on the metal/corrodent interface, inhibiting both the anodic and cathodic half reactions of the corrosion process.
Conclusion
The result obtained from this study clearly shows that RL functioned as a good inhibitor for the corrosion of mild steel in 1 M HCl and 0.5 M H₂SO₄ solutions and the inhibiting efficiency value increased with the inhibitor concentration. The adsorption of the RL on the mild steel surface in acid solution obeyed Langmuir adsorption isotherm.

کلیدواژه‌ها

Rothmannia longiflora؛ Corrosion inhibition؛ Mild steel