Synergistic Inhibition Effect of Walnut Green Husk Extract Complex Inhibitors on Steel in Phosphoric Acid

doi:10.11902/1005.4537.2021.160

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (3): 358-368 DOI: 10.11902/1005.4537.2021.160

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Synergistic Inhibition Effect of Walnut Green Husk Extract Complex Inhibitors on Steel in Phosphoric Acid

LI Xianghong¹(

), XU Xin¹, LEI Ran¹, DENG Shuduan²

^1.College of Chemical Engineering, Southwest Forestry University, Kunming 650224, China
^2.Faculty of Materials Science and Engineering, Southwest Forestry University, Kunming 650224, China

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Abstract

The synergistic inhibition effect of forestry and agricultural residue of walnut green husk extract (WGHE) and the anionic surfactant of SLS on the corrosion of cold rolled steel (CRS) in 2.0 mol/L H₃PO₄ solution was studied by mass loss measurement, electrochemical technique and surface analysis methods. The results show that individual WGHE or SLS exhibits moderate inhibition capacity with the maximum inhibition efficiency of c.a. 50% for a dosage of 100 mg/L at 50 ℃. However, incorporation of WGHE with SLS can obtain better inhibitive performance, and the maximum inhibition efficiency (η_w) can reach as high as 95.3%. There is a strong synergistic inhibition effect for WGHE and SLS. The synergism parameter increases with the increase of temperature in general. WGHE/SLS can more efficiently retard both cathodic and anodic reactions simultaneously. Nyquist spectrum exhibits a depressed capacitive loop, and the charge transfer resistance follows the order: WGHE/SLS＞WGHE＞SLS. SEM and AFM micrographs confirm that WGHE/SLS can efficiently alleviate the corrosion degree of steel surface in phosphoric acid media. There is a synergism between SLS with any one of the major components such as rutin, quercetin and 1-methylnaphoqinone in WGHE respectively, but their synergistic inhibition is all below that of the complex WGHE/SLS.

Key words: walnut green husk sodium lauryl sulfonate cold rolled steel synergistic inhibition effect phosphoric acid

Received: 12 July 2021

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51761036);Fundamental Research Project for Distinguished Young Scholars in Yunnan Province(202001AV070008);Special Project of "Top Young Talents" of Yunnan Ten Thousand Talents Plan(51900109)

Corresponding Authors: LI Xianghong E-mail: xianghong-li@163.com

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

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Cite this article:

LI Xianghong, XU Xin, LEI Ran, DENG Shuduan. Synergistic Inhibition Effect of Walnut Green Husk Extract Complex Inhibitors on Steel in Phosphoric Acid. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 358-368.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.160 OR https://www.jcscp.org/EN/Y2022/V42/I3/358

Fig.1 Variations of inhibition efficiencies of WGHE (a) and SLS (b) with inhibitor concentration during corrosion of cold-rolled steel at 20~50 ℃ in 2.0 mol/L H₃PO₄

Fig.2 Linear fittings of c/θ-c or lnθ-lnc curves for the adsorption of two inhibitors on cold-rolled steel in 2.0 mol/L H₃PO₄: (a) WGHE at 20~50 ℃, (b) SLS at 20 and 30 ℃, (c) SLS at 40 and 50 ℃

Table 1 Linear regression parameters of c/θ-c orlnθ-lnc curves

Fig.3 Relationships between inhibition efficiency and inhibitor concentration for WGHE/SLS mixture at 20~50 ℃ in 2.0 mol/L H₃PO₄

Fig.4 Synergism parameters for the synergistic inhibition of WGHE and SLS in 2.0 mol/L H₃PO₄solution at 20~50 ℃

Fig.5 Potentiodynamic polarization curves of cold-rolled steel at 20 ℃ in 2.0 mol/L H₃PO₄ solutions containing different inhibitors of WGHE (a), SLS (b) and WGHE+SLS (c)

Table 2 Fitting electrochemical parameters of potentiodynamic polarization curves of cold-rolled steel at 20 ℃ in 2.0 mol/L H₃PO₄ solutions containing WGHE, SLS and WGHE/SLS

Fig.6 Nyquist plots of cold-rolled steel at 20 ℃ in 2.0 mol/L H₃PO₄ solutions containing the inhibitors of WGHE (a), SLS (b) and WGHE+SLS (c)

Fig.7 Equivalent circuit model of EIS

Table 3 Fitting parameters of EIS of cold-rolled steel in 2.0 mol/L H₃PO₄ solutions containing WGHE, SLS and WGHE/SLS at 20 ℃

Fig.8 UV spectra of synergistic inhibition system

Fig.9 SEM surface micrographs of cold rolled steel before (a) and after immersion at 20 ℃ for 6 h in 2.0 mol/L H₃PO₄ solutions containing 0 mg/L inhibitor (b), 100 mg/L WGHE (c), 100 mg/L SLS (d) and 50 mg/L WGHE+50 mg/L SLS (e)

Fig.10 3D-AFM surface micrographs of cold rolled steel before (a) and after immersion at 20 ℃ for 6 h in 2.0 mol/L H₃PO₄ solutions containing 0 mg/L inhibitor (b), 100 mg/L WGHE (c), 100 mg/L SLS (d) and 50 mg/L WGHE+50 mg/L SLS (e)

Fig.11 Chemical molecular structures of major components in WGLE: (a) rutin; (b) quercetin; (c) 1-methylnaphoqinone

Fig.12 HPLC chromatograms of standard substance and WGHE: (a) rutin, (b) quercetin, (c) 1-methylnaphoqinone, (d) WGHE

Fig.13 Inhibition efficiency vs temperature curves for different substances added in 2.0 mol/L H₃PO₄ solution

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