Corrosion inhibition of mild steel in 1 M HCl solution by henna extract: A comparative study of the inhibition by henna and its constituents (Lawsone, Gallic acid, α-d-Glucose and Tannic acid) |
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| Authors: | A. Ostovari S.M. Hoseinieh M. Peikari S.R. Shadizadeh S.J. Hashemi |
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| Affiliation: | aTechnical Inspection Engineering Department, Petroleum University of Technology, Abadan, Iran;bPetroleum Engineering Department, Petroleum University of Technology, Abadan, Iran |
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| Abstract: | The inhibitive action of henna extract (Lawsonia inermis) and its main constituents (lawsone, gallic acid, α-d-Glucose and tannic acid) on corrosion of mild steel in 1 M HCl solution was investigated through electrochemical techniques and surface analysis (SEM/EDS). Polarization measurements indicate that all the examined compounds act as a mixed inhibitor and inhibition efficiency increases with inhibitor concentration. Maximum inhibition efficiency (92.06%) is obtained at 1.2 g/l henna extract. Inhibition efficiency increases in the order: lawsone > henna extract > gallic acid > α-d-Glucose > tannic acid. Also, inhibition mechanism and thermodynamic parameters are discussed. |
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| Keywords: | A. Acid solutions B. EIS B. SEM C. Acid inhibition C. Pitting corrosion |
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