Corrosion inhibition properties of Gongronema latifollium extract in acidic media

• C.O. Akalezi¹, C.E. Ogukwe¹, E.A. Ejele² and E.E. Oguzie¹

¹ Electrochemical and Material Science Unit (EMRU), Department of Chemistry, School of Sciences, Federal University of Technology Owerri, Nigeria
² Department of Chemistry; School of Physical Sciences, Federal University of Technology Owerri, Nigeria

Abstract: Corrosion inhibition of mild steel in 1 M HCl acid solution by Gongronemena latifolium (GL) extract was investigated by weight-loss and electrochemical techniques. A significant decrease in the corrosion rate of mild steel was observed in the presence of the investigated additive and the inhibition efficiency was found to depend on the concentration of the GL extract. The potentiodynamic polarization data indicated that this additive was of mixed type, but the anodic effect was more pronounced. Nyquist plots showed that on increasing the extract concentration, the charge transfer resistance increased and double layer capacitance decreased. Adsorption of inhibitor GL extract on the mild steel surface is found to obey the Langmuir adsorption isotherm. Increase in activation energy of corrosion process in presence of GL extract indicates physical adsorption.

Keywords: Gongronemena latifolium, mild steel, corrosion inhibition, hydrochloric acid.

Int. J. Corros. Scale Inhib., 2016, 5, no. 3, 232–247 PDF (384 K)
doi: 10.17675/2305-6894-2016-5-3-4

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