Portulaca oleracea leaf extract as a green corrosion inhibitor for mild steel in 1 M HCl

• M.T. Hayajneh, M.A. Almomani and W.M. AlSharman

Industrial Engineering Department, Faculty of Engineering, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan

Abstract: Portulaca oleracea leaf extract (POLE) was tested for corrosion inhibition on mild steel in 1 M HCl solution using the potentiodynamic polarization (PDP) and weight loss tests with different concentrations at room temperature. The results suggest that POLE is an excellent corrosion inhibitor and the inhibition efficiency is concentration and time-dependent. The inhibition efficiency increases with increasing POLE concentration and immersion time. The maximum inhibitory efficiency of 93.84% was observed at a concentration of 4 g/L at room temperature. As can be seen from the PDP test, the POLE behaves as a mixed inhibitor and the anodic effect is predominant. The results show that POLE inhibited the corrosion process through the physical adsorption mechanism according to the Langmuir adsorption isotherm model. The Fourier Transform Infrared Spectrometer (FTIR) confirmed the presence of several functional groups with heteroatoms, while the adsorption phenomenon was verified using the UV-visible spectroscopy technique. The results ensure that POLE can form an effective barrier and control corrosion. The obtained results of various tests proved that POLE is an effective green inhibitor for the corrosion of mild steel in an acidic solution.

Keywords: corrosion, green inhibitor, mild steel, polarization, weight loss, Portulaca oleracea

Int. J. Corros. Scale Inhib., 2024, 13, no. 2, 975-994
doi: 10.17675/2305-6894-2024-13-2-18

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