TY  - JOUR
AU  - Faustin, M.
AU  - Maciuk, A.
AU  - Salvin, P.
AU  - Roos, C.
AU  - Lebrini, M.
PY  - 2015//
TI  - Corrosion inhibition of C38 steel by alkaloids extract of Geissospermum laeve in 1M hydrochloric acid: Electrochemical and phytochemical studies
T2  - Corrosion Science
JO  - Corrosion Science
SP  - 287
EP  - 300
VL  - 92
KW  - A. C38 steel
KW  - B. Eis
KW  - B. Sem
KW  - C. Acid corrosion
KW  - C. Anodic protection
KW  - C. Cathodic protection
N2  - Corrosion inhibition by alkaloids extract (AE) from Geissospermum laeve on C38 steel in 1. M HCl is investigated with electrochemical studies. Inhibition efficiency of 92% is reached with 100. mg/L of AE at 25. °C. Potentiodynamic polarization showed that the extract behaves as mixed-type inhibitors. The Nyquist plots showed that increasing AE concentration, charge-transfer resistance increased and double-layer capacitance decreased, involving increased inhibition efficiency. Adsorption of the inhibitor molecules corresponds to Langmuir adsorption isotherm. Immersion time and temperature effects were investigated using EIS and potentiodynamic polarization. SEM and EDX supported the adsorption conclusions. The active compound responsible for the corrosion inhibition is geissospermine.
UR  - http://www.scopus.com/inward/record.url?eid=2-s2.0-84921403334&partnerID=40&md5=779cb2d244575a439dc50c49413f27f1
N1  - Export Date: 6 February 2015
ID  - Faustin_etal2015
ER  -