An insight on the corrosion inhibition of mild steel in aggressive medium by henna extract

• J. Serbout¹, R. Touzani¹, M. Bouklah^1,2 and B. Hammouti¹

¹ University Mohammed Premier, Faculty of Sciences, Laboratory of Environment and Applied Chemistry (LCAE), BP 717, 60000 Oujda, Morocco
² Centre Regional des Metiers de l’Education et de la Formation (CRMEF), 60000 Oujda, Morocco

Abstract: Green chemistry becomes in the last decade a tool for the sustainable developments in various sectors, the reorientation of the use of environmentally ecofriendly alternatives is gaining attention in the field of corrosion protection. The use of natural plant extracts as corrosion inhibitors is counted by thousands of papers and industrial patents. Plant extracts contain complex phytochemicals that interact strongly with metallic surface through their electron rich sites. In this context, this review investigates the corrosion inhibitive action of henna (Lawsonia Inermis) leaves extracts on mild steel in various acid media by weight loss measurements (WL) as chemical measurements and by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) as electrochemical ones. The study indicates that as the acid concentration increases, the corrosion rate increases. The corrosion inhibition efficiency increases with an increase in the concentration of the extract. The results obtained reveal that the henna leaves extract acts as an efficient inhibitor. The adsorption of the henna leaves extracts obeys the Langmuir adsorption isotherm. The calculated thermodynamic parameters indicate that the adsorption is a spontaneous, exothermic process accompanied by an increase in entropy. Cathodic and anodic polarization curves show that the henna leaves extract is a mixed-type inhibitor. The inhibitory action is generally explained as an intermolecular synergistic effect of different components of the natural extract.

Keywords: mild steel, acetic acid solution, henna leaves extract, corrosion inhibitor, WL, PDP, EIS

Int. J. Corros. Scale Inhib., 2021, 10, no. 3, 1042-1068
doi: 10.17675/2305-6894-2021-10-3-14

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