Corrosion Inhibition of Aluminum in HCl Solution by Flos Sophorae Immaturus Extract

doi:10.11902/1005.4537.2021.337

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (6): 939-947 DOI: 10.11902/1005.4537.2021.337

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Corrosion Inhibition of Aluminum in HCl Solution by Flos Sophorae Immaturus Extract

LEI Ran, SHI Chengjie, LI Xianghong(

)

Key Laboratory of State Forestry and Grassland Administration on Highly-Efficient Utilization of Forestry Biomass Resources in Southwest China, College of Chemical Engineering, Southwest Forestry University, Kunming 650224, China

Cite this article:

LEI Ran, SHI Chengjie, LI Xianghong. Corrosion Inhibition of Aluminum in HCl Solution by Flos Sophorae Immaturus Extract. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 939-947.

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Abstract

Flos Sophorae Immaturus extract (FSIE) was acquired by ultrasonic extraction method with ethanol solution as extract agent. The corrosion inhibition of Al-plate in 1.0 mol/L HCl solution by FSIE was studied for the first time by means of mass loss measurement, electrochemical method and surface analysis (SEM and AFM). The functional groups of FSIE and the formed inhibition film on Al is characterized by FTIR. The results show that FSIE has a significant inhibition effect on Al in 1.0 mol/L HCl solution. The inhibition efficiency enhances with the increase of FSIE concentration, while decreases with the increasing temperature. The inhibition efficiency can reaches 83.2% for a dose of 500 mg/L FSIE at 20 ℃. The adsorption of FSIE on Al surface conforms to Langmuir adsorption isotherm, and the adsorption type is a mixture of physical and chemical adsorption while mainly the physical adsorption. Potentiodynamic polarization curves show that FSIE is a cathodic inhibitor that prominently inhibits the cathodic hydrogen evolution. The capacitive arc in Nyquist plot at high frequencies increases with the concentration of PSIE. The inhibited aluminum surface by FSIE exhibits low corrosion extent as well as low surface roughness. FTIR confirms that FSIE can efficiently adsorb on Al surface to from inhibition film.

Key words: Flos Sophorae Immaturus extract Al HCl inhibition adsorption

Received: 25 November 2021

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52161016);National Natural Science Foundation of China(51761036);Joint Key Project of Agricultural Fundamental Research in Yunnan Province(2017FG001(-004));Fundamental Research Project for Distinguished Young Scholars in Yunnan Province(202001AV070008);Special Project of "Top Young Talents" of Yunnan Ten Thousand Talents Plan(51900109);Yunnan Provincial Education Department Scientific Research Fund Project(2021J0147);Yunnan University Student Innovation and Entrepreneurship Training Program(202110677014)

About author: LI Xianghong, E-mail: xianghong-li@163.com

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.337 OR https://www.jcscp.org/EN/Y2022/V42/I6/939

Fig.1 Variations of η_wand v with FSIE concentration in 1.0 mol/L HCl solution at different temperatures

Fig.2 Fitted straight lines of c/θ vs.c curvesin 1.0 mol/L HCl solution at different temperatures

Table 1 Adsorption parameters of aluminum in 1.0 mol/L HCl solutions containing FSIE at different temperatures

Fig.3 Fitted straight line of lnK-1/T in 1.0 mol/L HCl solution at different temperatures

Table 2 Thermodynamic parameters of adsorption of FSIE on aluminum surface

Fig.4 Fitted straight lines of lnv-1/T curvesin 1.0 mol/L HCl solution at different temperatures

Fig.5 Corrosion kinetics parameters of Al in 1.0 mol/L HCl solutions containing different concentrations of FSIE

Fig.6 Potential polarization curves of aluminum in 1.0 mol/L HCl solutions containing different concentrations of FSIE at 20 ℃

Table 3 Fitting parameters of potentiodynamic polarization curves of aluminum in 1.0 mol/L HCl solutions containing different concentrations of FSIE at 20 ℃

Fig.7 Electrochemical impedance spectra of aluminum in 1.0 mol/L HCl solutions containing different concentrations of FSIE at 20 ℃: (a) Nyquist plots, (b) Bode modulus, (c) Bode phase angle plots

Fig.8 Equivalent circuit diagram for EIS data fitting

Table 4 Fitting parameters of EIS of aluminum in 1.0 mol/L HCl solutions containing different concentrations of FSIE at 20 ℃

Fig.9 SEM surface images of aluminum before (a) and after immersion at 20 ℃ for 2 h in 1.0 mol/L HCl solutions containing 0 mg/L (b) and 500 mg/L (c) FSIE

Fig.10 AFM surface images of aluminum before (a) and after immersion at 20 ℃ for 2 h in 1.0 mol/L HCl solutions containing 0 mg/L (b) and 500 mg/L (c) FSIE

Table 5 AFM microstructure roughness parameters of aluminum surface

Fig.11 Infrared spectra of FSI, FSIE and corrosion products formed on Al immersed in HCl solution containing FSIE

Fig.12 HPLC profiles of FSIE (a), quercetin (b) and rutin (c)

Fig.13 Standard curves of quercetin (a) and rutin (b)

Fig.14 Chemical structures of quercetin (a), rutin (b) and complex of Al³⁺ and flavonoids (c)

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