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| Corrosion Inhibition Performance of Diethylammonium O,O '-Di(2-phenylethyl)dithiophosphate for Q235 Steel in HCl Solution |
| XIE Bin1, 2, ZHU Shasha1, LI Yulong1, LAI Chuan2, LIN Xiao1, ZOU Like1, HE Linxin1, CHEN Neng1 |
| 1. Institute of Functional Materials, Material Corrosion and Protection Key Laboratory of Sichuan Province, University Key Laboratory of Green Catalysis of Sichuan Institutes of Higher Education, Sichuan University of Science & Engineering, Zigong 643000, China; 2. College of Chemistry & Chemical Engineering, Chongqing University, Chongqing 400044, China |
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Abstract A new corrosion inhibitor, diethylammonium O,O '-di(2-phenylethyl)dithiophosphate (EPP), was synthesized and characterized by elemental analysis and IR spectrum. Its inhibitive effect, adsorption behavior, and influence factors for Q235 steel in HCl solution were evaluated by weight loss measurement, potentiodynamic polarization, and electrochemical impedance spectroscopy. The results showed that EPP was a mixed type inhibitor, the inhibitive efficiency increased gradually with the increase of inhibitor concentration, but decreased slowly with temperature of corrosion system. The inhibitive efficiency was up to 98.48% at the inhibitor concentration of 60 mgL-1 in 1.0 molL-1 HCl at 30 ℃. The adsorption of EPP on Q235 steel surface was consistent with the Langmuir adsorption isotherm and belonged to chemisorptions. The quantum chemical calculations showed that the coordination bond and back-donating bond could be easily formed between inhibitor molecules and metal Fe atoms, and thereby the multicenter, stable chemical adsorption could be formed.
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Received: 05 September 2013
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Cite this article:
XIE Bin, ZHU Shasha, LI Yulong, LAI Chuan, LIN Xiao, ZOU Like, HE Linxin, CHEN Neng. Corrosion Inhibition Performance of Diethylammonium O,O '-Di(2-phenylethyl)dithiophosphate for Q235 Steel in HCl Solution. Journal of Chinese Society for Corrosion and protection, 2014, 34(4): 366-374.
URL:
https://www.jcscp.org/EN/10.11902/1005.4537.2013.139 OR https://www.jcscp.org/EN/Y2014/V34/I4/366
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