PT Journal
AU Lecante, A
   Robert, F
   Lebrini, M
   Roos, C
TI Inhibitive Effect of Siparuna Guianensis Extracts on the Corrosion of Low Carbon Steel in Acidic Media
SO International Journal of Electrochemical Science
JI Int.J.Electrochem.Sci.
PY 2011
BP 5249
EP 5264
VL 6
IS 11
DE Alkaloids extract; corrosion inhibition; C38 steel; EIS; raman spectroscopy
AB The present study examines the effect of alkaloids extract from Siparuna guianensis leaves and stems on corrosion of C38 steel in 0.1 M HCl using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization technique and Raman spectroscopy. The protection efficiency is better with stems alkaloids extract. The inhibition was assumed to occur via adsorption of inhibitor molecules on the metal surface. The influence of stems alkaloids extract concentration on corrosion of low carbon steel in 0.1 M HCl was studied. The inhibition efficiency obtained from impedance and polarization measurements was in a good agreement and was found to increase with increasing concentration of alkaloids extract up to 50 mg/L for stems extract. The adsorption of the extract on the low carbon steel surface obeys the Langmuir adsorption.
ER