17-JMES,绿色化学缓蚀剂英文文献.doc

17-JMES,绿色化学缓蚀剂英文文献
J. Mater. Environ. Sci. 4 (1) (2021) 127-138 Benali et al. ISSN : 2028-2508
CODEN: JMESCN
Green corrosion inhibitor: inhibitive action of tannin extract
of Chamaerops humilis plant for the corrosion of mild steel in M H2SO4
Department of Biology, Faculty of Sciences and Technology ,Univesrity Dr Moulay Tahar - Sa?da (Algeria) 2 Department of Engineering Procedures, University of Bechar 08000 Algeria. 3Laboratory of LASNABIO, Department of Chemistry, University of Tlemcen 13000 Algeria. 4Equipe de Génie de l’Environnement et de Biotechnologie, ENSA, Université Ibn Zohr, BP 1136 Agadir, Morocco
1O. Benali *, H. Benmehdi , O. Hasnaoui 1, C. Selles 3, R. Salghi4 1,2
Received 08 Aug 2021, Revised 11 Sept 2021, Accepted 11 Sept 2021
*Corresponding author. Email:
Abstract
The corrosion and inhibition behaviors of mild steel in sulfuric acid + 5% EtOH in the presence of tannin extract of Chamaerops humilis plant (LF-Ch) and potassium iodide (KI) have been studied using the electrochemical methods. It was found that the inhibition efficiency increased with LF-Ch extract concentration. The addition of potassium iodide to LF-Ch extract in solution increased the inhibition efficiency of this latter. A synergistic effect was observed between KI and extract with optimum of concentration of 100 mg /L LF-Ch extract + % potassium iodide. Adsorption of extract alone or in combination with potassium iodide on the metal surface obeyed the Langmuir adsorption isotherm and thermodynamic calculations revealed that the adsorption of inhibitor were of chemical nature. That suggest the presence of iodide ions in solution increases the surface coverage. The adsorption of LF-Ch extract on the mild steel in aggressive medium leads to the formation of a protective film which grows in thickness and effectiveness with increasing ex