期刊
CORROSION SCIENCE
卷 50, 期 11, 页码 2993-2998出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2008.08.004
关键词
Acid solution; Mild steel; Acid corrosion; Acid inhibition
Corrosion inhibition of mild steel in 2 M HCl and 1 M H2SO4 by extracts of selected plants was investigated using a gasometric technique at temperatures of 30 and 60 degrees C.The studied plants materials include leaf extracts Occimum viridis (OV), Telferia occidentalis (TO), Azadirachta indica (Al) and Hibiscus sabdariffa (HS) as well as extracts from the seeds of Garcinia kola (GK). The results indicate that all the extracts inhibited the corrosion process in both acid media by virtue of adsorption and inhibition efficiency improved with concentration. Synergistic effects increased the inhibition efficiency in the presence of halide additives. Inhibition mechanisms were deduced from the temperature dependence of the inhibition efficiency as well as from assessment of kinetic and activation parameters that govern the processes. Comparative analysis of the inhibitor adsorption behaviour in 2 M HCl and 1 M H2SO4 as well as the effects of temperature and halide additives suggest that both protonated and molecular species could be responsible for the inhibiting action of the extracts. (C) 2008 Elsevier Ltd. All rights reserved.
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