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J Chin Soc Corr Pro  2011, Vol. 31 Issue (2): 149-154    DOI:
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INHIBITION EFFECT OF DENDROCALAMUS BRANDISII LEAVES EXTRACT ON STEEL IN HYDROCHLORIC ACID SOLUTION
LI Xianghong1, FU Hui1, DENG Shuduan2
1. Department of Fundamental Courses, Southwest Forestry University, Kunming 650224
2. Faculty of Wood Science and Decoration Technology, Southwest Forestry University, Kunming 650224
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Abstract  Dendrocalamus brandisii leaves extract (DBLE) can be used as an environmentally-friendly plant inhibitor. Fourier transform infrared (FTIR) spectroscopy was employed to study the main functional groups of DBLE. The inhibition effect of DBLE on the corrosion of cold rolled steel (CRS) in 1.0 mol/L hydrochloric acid (HCl) solution was studied by weight loss, potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), and scanning electron microscope (SEM) methods. The results show that DBLE is a good inhibitor, and the maximum inhibition efficiency is up to 93%. The adsorption of DBLE on CRS surface obeys Langmuir adsorption isotherm. The experimental data have been treated with Van't Hoff and Arrhenius equations. The adsorption heat ΔHads and apparent activation energy Ea are also calculated, and the inhibitive mechanism is discussed in detail according to the parameters. Polarization curves reveal that DBLE behaves as a mixed-type inhibitor. EIS spectra exhibit one capacitive loop and charge transfer resistance value increases with the inhibitor concentration. SEM results further confirm the good inhibitive ability of DBLE.
Key words:  dendrocalamus brandisii      extract      hydrochloric acid      steel      inhibition      adsorption     
Received:  05 January 2010     
ZTFLH: 

TG174.42

 
Corresponding Authors:  LI Xianghong     E-mail:  xianghong-li@163.com

Cite this article: 

LI Xianghong, FU Hui, DENG Shuduan. INHIBITION EFFECT OF DENDROCALAMUS BRANDISII LEAVES EXTRACT ON STEEL IN HYDROCHLORIC ACID SOLUTION. J Chin Soc Corr Pro, 2011, 31(2): 149-154.

URL: 

https://www.jcscp.org/EN/     OR     https://www.jcscp.org/EN/Y2011/V31/I2/149

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