Inhibition of the corrosion of steel in HCl, H2SO4 solutions by bamboo leaf extract

• DOI: 10.1016/j.corsci.2012.05.008
• Publication Date: 2012-05-26T15:33:29Z
• Authors: Xianghong Li; Shuduan Deng; Hui Fu
• Keywords: Langmuir adsorption model; Corrosion inhibitor

Abstract The inhibition effect of the bamboo of Dendrocalmus sinicus Chia et J.L. Sun leaf extract (DSCLE) on the corrosion of cold rolled steel (CRS) in 1.0–5.0 M HCl, 0.5–5.0 M H 2 SO 4 solutions was studied by weight loss, potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and atomic force microscope (AFM) methods. The results show that DSCLE is a good inhibitor in 1.0 M HCl and 0.5 M H 2 SO 4 , and inhibition efficiency follows the order: HCl > H 2 SO 4 . The adsorption of DSCLE on CRS surface obeys Langmuir adsorption isotherm, and acts as a mixed-type inhibitor in both acids.