Preparation and Corrosion Inhibition of Super Hydrophobic Adsorption Film of Lotus Leaf Extract on Mild Steel

doi:10.11902/1005.4537.2021.296

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (6): 903-912 DOI: 10.11902/1005.4537.2021.296

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Preparation and Corrosion Inhibition of Super Hydrophobic Adsorption Film of Lotus Leaf Extract on Mild Steel

LUO Weiping¹, LUO Xue¹, SHI Yueting¹, WANG Xinchao¹^,², ZHANG Shengtao¹, GAO Fang¹(

), LI Hongru¹

1. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
2. College of Pharmacy, Heze University, Heze 274015, China

Cite this article:

LUO Weiping, LUO Xue, SHI Yueting, WANG Xinchao, ZHANG Shengtao, GAO Fang, LI Hongru. Preparation and Corrosion Inhibition of Super Hydrophobic Adsorption Film of Lotus Leaf Extract on Mild Steel. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 903-912.

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Abstract

In order to search for new green and low-cost organic corrosion inhibitors, the fresh lotus leave was selected as raw material, and then lotus leaf extract (LLE) was obtained by simple ethanol reflux extraction. The LLE could produce orderly aggregation material in a mixture of THF/HCl (tetrahydrofuran/HCl) solution (1.0 mol/L HCl solution) at room temperature. The results of Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) showed that the LLE underwent chemisorption on the surface of Q235 steel, and further the LLE could be adsorbed on the surface of mild steel, which formed super hydrophobic organic adsorption film. Electrochemical test results showed that lotus leaf extract had good corrosion inhibition performance for carbon steel in HCl solution. The maximal corrosion inhibition efficiency of LLE reached 93.14% for Q235 steel in HCl solution of 0.4 g/L.

Key words: lotus leaf extract carbon steel corrosion inhibitor super hydrophobic adsorption layer

Received: 21 October 2021

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(21878029);National Natural Science Foundation of China(21676035);Chongqing Science and Technology Commission(cstc2018jcyjAX0668);Natural Science Foundation of Shandong Province(ZR2020QB180)

About author: GAO Fang, E-mail: fanggao1971@gmail.com

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	Weiping LUO
	Xue LUO
	Yueting SHI
	Xinchao WANG
	Shengtao ZHANG
	Fang GAO
	Hongru LI

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.296 OR https://www.jcscp.org/EN/Y2022/V42/I6/903

Fig.1 SEM images of LLE aggregates formed after aggregation in THF/HCl solution containing 0.4 g/L LLE for 30 min (a), 2 h (b), 6 h (c), 10 h (d) and 48 h (e)

Fig.2 SEM images of LLE aggregates formed after 10 h aggregation in the THF/HCl mixed solutions containing 0.1 (a), 0.2 (b), 0.3 (c), 0.4 (d) and 0.5 g/L (e) LLE

Fig.3 FT-IR spectrum of original LLE powders (a) and ATR-IR of LLE aggregates adsorbed on Q235 steel (b)

Fig.4 XPS fine spectra of Fe 2p3/2 on Q235 steel samples without (a) and with (b) LLE-aggregation treatment after immersion in HCl solution

Table 1 De-convolution parameters of XPS fine spectra of Fe 2p3/2 on Q235 steel samples without and LLE aggregation treatment

Fig.5 XPS fine spectra of C 1s on the surfaces of Q235 steel samples without (a) and with (b) LLE aggregat-ion treatment

Table 2 De-convolution parameters of XPS fine spectra of C 1s on the surfaces of Q235 steel samples without and with LLE aggregation treatment

Fig.6 XPS fine spectra of N 1s on the surface of Q235 steel adsorbed with LLE aggregates

Table 3 De-convolution parameters of XPS fine spectra of N 1s on the surfaces of Q235 steel samples without and with LLE aggregation treatment

Fig.7 SEM surface micrographs of Q235 steel samples with different surface treatments after immersion for 6 h in 1 mol/L HCl solution: bare (a), polishing (b), and aggregation of 0.3 (c), 0.4 (d) and 0.5 g/L (e) LLE

Fig.8 AFM micrographs (a-c) and (d-f) the corresponding height profiles of polished Q235 steel samples without (a, d, b, e) and with (c, f) LLE aggregation before (a, d) and after (b, c, e, f) immersion in 1 mol/L HCl solution for 30 min

Fig.9 Contact angle diagrams of Q235 steel samples with-out (a) and with (b) LLE aggregates

Fig.10 Potentiodynamic polarization curves of Q235 steel electrodes adsorbed with different concentrations of LLE aggregates in 1 mol/L HCl solution

Table 4 Fitting parameters of potentiodynamic polarization curves of Q235 steel electrodes adsorbed with different concentrations of LLE aggregates in 1 mol/L HCl solution

Fig.11 Nyquist (a) and Bode (b, c) plots of Q235 steel electrodes adsorbed with different concentrations of LLE aggregates

Fig.12 Equivalent circuit diagram for fitting EIS of various Q235 steel electrodes

Table 5 Electrochemical impedance parameters of Q235 steel electrodes adsorbed with different concentrations of LLE aggregates in 1 mol/L HCl solution

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