Inhibition by <Emphasis Type="Italic">Jasminum nudiflorum</Emphasis> Lindl. leaves extract of the corrosion of cold rolled steel in hydrochloric acid solution |
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Authors: | Xiang-Hong Li Shu-Duan Deng Hui Fu |
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Affiliation: | (1) Department of Fundamental Courses, Southwest Forestry University, Kunming, 650224, People’s Republic of China;(2) Faculty of Wood Science and Decoration Engineering, Southwest Forestry University, Kunming, 650224, People’s Republic of China |
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Abstract: | 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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