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Inhibition by Ginkgo leaves extract of the corrosion of steel in HCl and H 2 SO 4 solutions

2011; Elsevier BV; Volume: 55; Linguagem: Inglês

10.1016/j.corsci.2011.11.005

1879-0496

Shuduan Deng, Xianghong Li,

Hydrogen embrittlement and corrosion behaviors in metals

The inhibition effect of Ginkgo leaves extract (GLE) on the corrosion of cold rolled steel (CRS) in 1.0–5.0 M HCl and 0.5–2.5 M H2SO4 solutions was investigated for the first time by weight loss, potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) methods. The results show that GLE is a good inhibitor, and exhibits more efficient in 1.0 M HCl than 0.5 M H2SO4. The adsorption of GLE on CRS surface obeys Langmuir adsorption isotherm. GLE acts as a mixed-type inhibitor in 1.0 M HCl, while a cathodic inhibitor in 0.5 M H2SO4.