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Citation: LI Xianghong, DENG Shuduan, FU Hui. Corrosion Inhibition of Yushania Polytricha Leaves Extract for Aluminum in Hydrochloric Acid Media[J]. Chinese Journal of Applied Chemistry, ;2012, 29(8): 962-968. doi: 10.3724/SP.J.1095.2012.00398 shu

Corrosion Inhibition of Yushania Polytricha Leaves Extract for Aluminum in Hydrochloric Acid Media

1.
a Faculty of Science, Southwest Forestry University, Kunming 650224, China;
2.
b Faculty of Materials Engineering, Southwest Forestry University, Kunming 650224, China

Corresponding author: LI Xianghong,
Received Date: 7 September 2011
Available Online: 7 November 2011
Fund Project: 国家自然科学基金资助项目(51161023) (51161023)云南省应用基础研究面上项目(2009CD072) (2009CD072)

The inhibition effect of Yushania polytricha leaves extract(YPLE) on the corrosion of aluminum in 1.0 mol/L HCl media was studied by mass loss,potentiodynamic polarization curves,electrochemical impedance spectroscopy,Fourier transform infrared spectroscopy,ultraviolet spectrophotometry and scanning electron microscope methods.The results show that YPLE is a good inhibitor,and the inhibition efficiency increases with the inhibitor concentration.The adsorption of YPLE on aluminum surface obeys Langmuir adsorption isotherm.YPLE behaves as a cathodic inhibitor.EIS spectra exhibit one capacitive loop at high frequencies followed by an inductive one at low frequency values,and the impedance value increases with the inhibitor concentration.SEM results confirm the corrosion of aluminum is retarded remarkably by the addition of YPLE.
- aluminum,
- hydrochloric acid,
- Yushania polytricha,
- extract,
- inhibition,
- adsorption
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