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Corrosion Inhibition of Vetiver Extract on Steel in Hydrochloric Acid Environment |
DENG Zhihua1(), LEI Ran2, ZHANG Zhiyong2, YANG Weiyu2, LI Xianghong2 |
1.College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China 2.College of Chemical Engineering, Southwest Forestry University, Kunming 650224, China |
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Abstract Vetiveria zizanioides was extracted by reflux extraction method to obtain vetiver extract (VZE). The corrosion inhibition of a cold rolled carbon steel by VZE in 1.0 mol/L hydrochloric acid solution was investigated by means of mass loss measurement and electrochemical methods. The results showed that the best corrosion inhibition was achieved by a dose of 0.20 g/L VZE at 30 ℃, with a corrosion inhibition rate of 91.9%. The adsorption of VZE on the steel surface conforms to the Langmuir adsorption isotherm, and the adsorption type is a mixed adsorption type of combined physical and chemical adsorption. The dynamic potential polarization curve shows that VZE can inhibit both the cathodic and anodic reactions, and is a mixed inhibition type corrosion inhibitor. With the increase of VZE concentration, the electrochemical impedance spectrum capacitive arc increases significantly, the charge transfer resistance of steel increases, and the corrosion reaction rate decreases. In other word, the VZE can provide good corrosion inhibition for the cold rolled carbon steel in 1.0 mol/L hydrochloric acid solution.
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Received: 10 March 2022
32134.14.1005.4537.2022.065
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Fund: Yunnan University Student Innovation and Entrepreneurship Training Program (2020), Southwest Forestry University Education Science Research Program(YB202023);Yunnan Provincial Department of Education Science Research Fund Project(2021J0163);Yunnan Provincial Philosophy and Social Science Fund Project(SH2021081);Yunnan Provincial Philosophy and Social Science Popularization Project(2142008) |
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