Journal
JOURNAL OF APPLIED ELECTROCHEMISTRY
Volume 40, Issue 9, Pages 1641-1649Publisher
SPRINGER
DOI: 10.1007/s10800-010-0151-5
Keywords
Jasminum nudiflorum Lindl.; Corrosion inhibitor; Hydrochloric acid; Cold rolled steel; Polarization; EIS; FTIR; SEM
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Funding
- Key Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China (Southwest Forestry University) Ministry of Education, Key Construction Course of Chemical Engineering for Forest Products of Southwest Forestry University [XKX200907]
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The inhibition effect of Jasminum nudiflorum Lindl. leaves extract (JNLLE) on the corrosion of cold rolled steel (CRS) in 1.0 M hydrochloric acid (HCl) was investigated by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) methods. The results show that JNLLE acts as a very good inhibitor, and the inhibition efficiency increases with the concentration of JNLLE. The adsorption of JNLLE obeys Langmuir adsorption isotherm. Values of inhibition efficiency obtained from weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) are in good agreement. Polarization curves show that JNLLE behaves as a mixed-type inhibitor in hydrochloric acid. EIS shows that charge-transfer resistance increase and the capacitance of double layer decreases with the inhibitor concentration, confirming the adsorption process mechanism. The adsorbed film on CRS surface containing JNLLE inhibitor was also measured by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). A probable inhibitive mechanism is proposed from the viewpoint of adsorption theory.
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