Journal
CORROSION SCIENCE
Volume 51, Issue 9, Pages 1935-1949Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.05.024
Keywords
Acid solutions; EIS; SEM; Acid inhibition; Pitting corrosion
Funding
- Research and Development Centre of Abadan Refinery
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The inhibitive action of henna extract (Lawsonia inermis) and its main constituents (lawsone, gallic acid, alpha-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 > alpha-D-Glucose > tannic acid. Also, inhibition mechanism and thermodynamic parameters are discussed. (C) 2009 Elsevier Ltd. All rights reserved.
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