Oil Soluble Mannich Base Corrosion Inhibitor for Corrosion Inhibition of Copper in Transformer Oil

doi:10.11902/1005.4537.2023.077

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (2): 453-461 DOI: 10.11902/1005.4537.2023.077

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Oil Soluble Mannich Base Corrosion Inhibitor for Corrosion Inhibition of Copper in Transformer Oil

ZHOU Wenbin, LI Mengran, ZHOU Xin(

), SUN Haijing, SUN Jie

School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110059, China

Cite this article:

ZHOU Wenbin, LI Mengran, ZHOU Xin, SUN Haijing, SUN Jie. Oil Soluble Mannich Base Corrosion Inhibitor for Corrosion Inhibition of Copper in Transformer Oil. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 453-461.

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Abstract

An oil-soluble Mannich base corrosion inhibitor (OMB) was synthesized from formaldehyde, dodecylamine and acetone, and which then was characterized by Fourier transform infrared spectroscopy (FT-IR). The corrosion inhibition effect of OMB and barium petroleum sulfonate (T701) on copper in 25# transformer oil was comparatively assessed by means of salt spray test, scanning electron microscopy (SEM) and atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). According to the quantum chemical calculation (Gaussian 09), molecular dynamics simulation (M-S) and Langmuir isothermal adsorption equation, the corrosion inhibition mechanism of OMB on copper was further discussed. The results show that OMB is a corrosion inhibitor with excellent corrosion inhibition effect on copper in salt spray test. The adsorption behavior of OMB on copper surface is spontaneous adsorption, which accords with mixed adsorption law and is mainly chemical adsorption, and the OMB moleculars are adsorbed parallel to the surface of copper.

Key words: mannich bases corrosion inhibition behavior quantum chemistry molecular dynamics

Received: 21 March 2023 32134.14.1005.4537.2023.077

ZTFLH:

TG178

Fund: Shenyang Ligong University Scientific Research Innovation Team Support Project(SYLUXM202105);Shenyang Ligong University Horizontal Research Fund(2021071904);Shenyang Ligong University High-level Talent Introduction Scientific Research Project(1010147000903)

Corresponding Authors: ZHOU Xin, E-mail: zhouxin@alum.imr.ac.cn

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	ZHOU Wenbin
	LI Mengran
	ZHOU Xin
	SUN Haijing
	SUN Jie

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.077 OR https://www.jcscp.org/EN/Y2024/V44/I2/453

Fig.1 Synthesis process of OMB

Fig.2 FT-IR spectrum of OMB

Fig.3 Inhibition efficiency of OMB (a) and T701 (b) in salt spray test

Fig.4 Corrosion inhibition mechanism of OMB adsorbed on copper surface

Fig.5 Surface morphologies of copper after 7 d salt spray test: (a) blank, (b) 7% T701, (c) 7% OMB

Fig.6 AFM images of copper after 7 d salt spray test: (a) blank, (b) 7% T701, (c) 7% OMB

Fig.7 XPS spectra of copper with 7% OMB after 7 d salt spray test: (a) total spectrum, (b) Cl 2p, (c) N 1s, (d) C 1s, (e) Cu 2p3/2, (f) O 1s

Fig.8 Langmuir isothermal adsorption line of copper containing OMB inhibitor after 1, 3, 5, 7 d salt spray experiment OMB

Fig.9 Adsorption mechanism of OMB

Fig.10 OMB's structure (a), HOMO (b), LUMO (c) and ESP (d)

Species	E_HOMO	E_LUMO	ΔE	P	AI	ΔN	$χ$	γ	σ
OMB	-0.04966	-0.23847	0.18881	0.04966	0.23847	9.29949	0.14407	0.09441	10.5921
[C₁₂H₂₅SO₃Ba]⁺	-0.22156	-0.35506	0.13350	0.22156	0.35506	12.0725	0.28831	0.06675	14.9812

Table 1 Quantum chemical parameters of OMB and [C₁₂H₂₅SO₃Ba]⁺

Fig.11 Side view (a), top view (b) and radial distribution index (c) of OMB equilibrium adsorption on Cu(111)

Species

T / K

$E b i n d i n g$

$E i n t e r a c t$

Cu-OMB-Oil

308

5.852

-5.852

Cu-OMB

308

4.781

-4.781

Table.2 Binding energy and interaction energy of OMB

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