Corrosion Inhibition of Vetiver Extract on Steel in Hydrochloric Acid Environment

doi:10.11902/1005.4537.2022.065

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (1): 173-178 DOI: 10.11902/1005.4537.2022.065

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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.

Key words: vetiver extract hydrochloric acid steel corrosion inhibition adsorption

Received: 10 March 2022 32134.14.1005.4537.2022.065

ZTFLH:

TG172.42

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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	Zhihua DENG
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Cite this article:

DENG Zhihua, LEI Ran, ZHANG Zhiyong, YANG Weiyu, LI Xianghong. Corrosion Inhibition of Vetiver Extract on Steel in Hydrochloric Acid Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 173-178.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.065 OR https://www.jcscp.org/EN/Y2023/V43/I1/173

Fig.1 Infrared spectrum of vetiver extract

Fig.2 Corrosion rates of the test steel in 1.0 mol/L HCl at different temperature solutions with concentrations of VZE

Fig.3 Variations of corrosion inhibition rate of the test steel in 1.0 mol/L HCl solution with mass conce-ntration of VZE at different temperature

Table 1 c/θ-c linear fitting parameters and standard Gibbs free energy of adsorption

Fig.4 Fitted straight lines of c/θ vs.c curves at different temperatures

Table 2 Fitting parameters of potentiodynamic polarization curves of the test steel in 1.0 mol/L HCl solutions containing different concentrations of VZE at 20 ℃

Fig.5 Potentiodynamic polarization curves of the test steel in 1.0 mol/L HCl solutions containing different concentrations of VZE at 20 ℃

Fig.6 Nyquist plots of the test steel at 20 ℃ in 1.0 mol/L HCl solutions containing different concentrations of VZE

Fig.7 Structural formula of some compounds in vetiver extract: (a) isovalencenol, (b) α-vetivone, (c) vetise-lineol, (d) α-amorphene

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