Corrosion Inhibition Mechanism of the Eco-friendly Corrosion Inhibitor Linagliptin on Copper in Sulfuric Acid

doi:10.11902/1005.4537.2023.144

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (5): 1031-1040 DOI: 10.11902/1005.4537.2023.144

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Corrosion Inhibition Mechanism of the Eco-friendly Corrosion Inhibitor Linagliptin on Copper in Sulfuric Acid

DONG Hongmei¹, LI Baoyi¹, RAN Boyuan²^,³, WANG Qi¹, NIU Yulan¹, DING Lifeng¹(

), QIANG Yujie²^,³(

)

^1.Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
^2.Nation Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
^3.Talented Doctoral Workstation of Ji Xian, Linfen 042200, China

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Abstract

Developing high-efficiency and eco-friendly corrosion inhibitors to replace traditional toxic and harmful ones is necessary to protect the ecological environment. Based on these premises, we employed electrochemical impedance techniques, gravimetric methods, and others to investigate the corrosion inhibition and mechanism of a low-cost drug, liraglutide (LNLP), used for human diabetes treatment, on copper in 0.5 mol/L sulfuric acid solution. The findings demonstrate that LNLP is a green, eco-friendly type of corrosion inhibitor, and is effective in inhibiting the corrosion of copper in sulfuric acid. The electrochemical results show that LNLP could slow down the corrosion rate of copper in 0.5 mol/L H₂SO₄ solution by increasing the film and charge transfer resistance and reducing the film and double-layer capacitance. When the concentration of LNLP is only 1 mmol/L, the η is as high as 99.95%. Potentiodynamic polarization curves results indicate that LNLP is a modest mixed-type inhibitor that can inhibit the anodic and cathodic reactions of copper. Based on the adsorption curve and theoretical calculation, the interaction between LNLP and the copper surface and the structure-performance relationship of LNLP molecule are revealed. The relevant results show that the adsorption of LNLP on the copper surface is parallel, providing max protection for copper. The adsorption of LNLP molecules on the copper is mainly through the nitrogen, oxygen heteroatoms, and conjugated ringy functional groups within the molecules, forming a single-molecule film through the synergistic effect of physical and chemical adsorption, isolating corrosive media from the copper surface.

Key words: Cu corrosion inhibitor sulfuric acid corrosion protection theoretical calculation

Received: 08 May 2023 32134.14.1005.4537.2023.144

ZTFLH:

TG174

Fund: Science and Technology Innovation Project of Colleges and Universities of Shanxi Province(2021L552);The 8th Youth Talent Promotion Project of China Association for Science and Technology(YESS20220689)

Corresponding Authors: DING Lifeng, E-mail: dinglf@tit.edu.cn;QIANG Yujie, E-mail: qiangyujie@ustb.edu.cn

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	DONG Hongmei
	LI Baoyi
	RAN Boyuan
	WANG Qi
	NIU Yulan
	DING Lifeng
	QIANG Yujie

Cite this article:

DONG Hongmei, LI Baoyi, RAN Boyuan, WANG Qi, NIU Yulan, DING Lifeng, QIANG Yujie. Corrosion Inhibition Mechanism of the Eco-friendly Corrosion Inhibitor Linagliptin on Copper in Sulfuric Acid. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 1031-1040.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2023.144 OR https://www.jcscp.org/EN/Y2023/V43/I5/1031

Fig.1 Molecular structure of Linagliptin

Fig.2 Nyquist (a, b), impedance module (c) and phase angle (d) plots of Cu in 0.5 mol/L H₂SO₄ with different concentrations of LNLP

Fig.3 Equivalent circuits for fitting EIS data: (a) used for blank curve, (b) used for curves with LNLP

Table 1 EIS parameters of Cu in H₂SO₄ solution containing various concentration of LNLP

Table 2 Inhibition efficiency of different corrosion inhibitors on Cu in 0.5 mol/L H₂SO₄ solution

Fig.4 Tafel curves for Cu in H₂SO₄ with various concentration of LNLP

Table 3 Tafel parameters of Cu in H₂SO₄ solution containing various concentration of LNLP

Fig.5 Mass loss results (a) and corresponding adsorp-tion curves (b) of Cu

Fig.6 Corrosion morphologies (a1, b1) and EDS results (a2, b2) of Cu in H₂SO₄ solution without (a1, a2) and with (b1, b2) 1 mmol/L LNLP

Fig.7 3D corrosion morphologies of Cu in H₂SO₄ solution without (a) and with (b) 1 mmol/L LNLP

Fig.8 Geometrically optimized configuration (a), LUMO (b) and HOMO (c) of LNLP molecule

Fig.9 Mulliken charge of LNLP molecule

Fig.10 Equilibrium adsorption configuration of LNLP on Cu (111) crystal plane: (a) top view, (b) side view

Fig.11 Schematic diagram of Cu corrosion mechanism in H₂SO₄ solution (a) and LNLP corrosion inhibition mechanism on Cu (b)

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