TY  - JOUR
T1  - The Inhibition and Adsorption Processes of L-Cysteine Against the Corrosion of XC 18 Carbon Steel in 2N H<SUB>2</SUB>SO<SUB>4</SUB>
AU - , L. Touafri AU - , A. Kadri AU - , A. Khelifa AU - , N. Aimeur AU - , N. Benbrahim 
JO  - Journal of Engineering and Applied Sciences
VL  - 3
IS  - 9
SP  - 688
EP  - 696
PY  - 2008
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2008.688.696
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2008.688.696
KW  - L-cysteine
KW  -ac impedance
KW  -corrosion inhibition
KW  -carbon steel
KW  -sulphuric acid
AB  - The inhibition effect of L-cysteine as environmentally friendly corrosion inhibitor for XC 18 carbon steel in stirred 2 N sulphuric acid has been investigated by electrochemical techniques. The impedance measurements showed that the inhibition efficiency increased with the increase of inhibitor concentration to reach more than 84% at 500 mg L<SUP>-1</SUP> and indicated that the amino acid act as mixed type inhibitor, while the adsorption followed the Langmuir isotherm. Effect of temperature is also studied in the 30-60°C range. The values of adsorption free energy ( G<SUP>0</SUP><SUB>ads</SUB>) and activation energies (E<SUB>a</SUB>) reveal a physical adsorption of the inhibitor on the steel surface.
ER  -