TY  - JOUR
T1  - Comparative Study on the Corrosion Inhibition of Mild Steel by Aqueous Extract of Fenugreek Seeds and Leaves in Acidic Solutions
AU - , Ehteram A. Noor 
JO  - Journal of Engineering and Applied Sciences
VL  - 3
IS  - 1
SP  - 23
EP  - 30
PY  - 2008
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2008.23.30
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2008.23.30
KW  - Corrosion inhibition
KW  -aqueous extract
KW  -acidic solutions
KW  -AEFL
KW  -AEFS
AB  - Electrochemical impedance spectroscopy and potentiodynamic polarization measurements were used to study the effect of Aqueous Extract of Fenugreek Leaves (AEFL) and Aqueous Extract of Fenugreek Seeds (AEFS) on the corrosion of mild steel sin HCl and H<SUB>2</SUB>SO<SUB>4</SUB> solutions. In both acids, AEFL and AEFS act predominately as anodic type inhibitors. The inhibition efficiency of both AEFL and AEFS increases with increasing of their concentration in 2.0 M of both acids, but at certain concentration of both extracts it decreases with increasing concentration of both acids. However, in HCl solutions, the inhibition efficiency of both AEFL and AEFS was always greater than in H<SUB>2</SUB>SO<SUB>4</SUB> solutions for otherwise identical conditions. In HCl solutions the adsorption of both AEFL and AEFS on mild steel surface obeys the Langmuir adsorption isotherm, while obeys the Temkin adsorption isotherm in H<SUB>2</SUB>SO<SUB>4</SUB> solutions. It was found that the obtained results from EIS and PDP measurements are in good agreement. Good correlation between the inhibitor constituents and its inhibition efficiency in both acids was obtained and discussed.
ER  -