Synergistic Corrosion Inhibition Effect of a Compound Inhibitor for Aluminum

doi:10.11902/1005.4537.2023.186

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (2): 312-322 DOI: 10.11902/1005.4537.2023.186

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Synergistic Corrosion Inhibition Effect of a Compound Inhibitor for Aluminum

LIU Zebang¹, RAN Boyuan²^,³, PEI Heng¹, LUO Kailin¹, ZHAO Zhibin¹, HAN Peng¹(

), QIANG Yujie²^,³(

)

^1.School of Chemical & Environmental Engineering, China University of Mining & Technology, Beijing 100083, China
^2.National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
^3.Talented Doctoral Workstation of Jixian, Linfen 042200, China

Cite this article:

LIU Zebang, RAN Boyuan, PEI Heng, LUO Kailin, ZHAO Zhibin, HAN Peng, QIANG Yujie. Synergistic Corrosion Inhibition Effect of a Compound Inhibitor for Aluminum. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 312-322.

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Abstract

The corrosion inhibition behavior of 4-mercaptopyridine (4MP), sodium dodecyl sulfate (SDS), and compound inhibitor 4MP-SDS for aluminum in 3.5%NaCl solution was comparatively investigated via experimental test and digital simulation. The results show that the presence of corrosion inhibitor could effectively reduce the free-corrosion current density. Moreover, the increase dosage of corrosion inhibitor has a positive effect on the enhancing desorption potential of corrosion inhibitor. The corrosion inhibition efficiency of the three inhibitors may be ranked as 4MP + SDS > SDS > 4MP. The mass loss test results show good agreement with the electrochemical test results. After the injection of compound inhibitor, a corrosion inhibitor film can form on the metal surface. Thus, the resistance to the diffusion and migration of corrosive ions increased and the corrosion rate of Al slowed down, correspondingly, the Al surface maintains a good metallic luster and shows the characteristics of a uniform corrosion pattern. In addition, the anti-corrosion mechanism of the compound inhibitor 4MP + SDS was revealed by molecular dynamics (MD) simulation. The compound inhibitor 4MP + SDS showed greater ability to slow down the build-up of interfacial water layers, increase the surface coverage, and the bonding effect is more stable, compared with the presence of a single 4MP or SDS, demonstrating the strong adsorption of the compound inhibitor on Al, while the best anti-corrosion performance.

Key words: aluminum corrosion corrosion inhibitor synergistic effect theoretical simulation

Received: 05 June 2023 32134.14.1005.4537.2023.186

ZTFLH:

TG174

Fund: Fundamental Research Funds for the Central Universities(2023JCCXJD01);Ministry of Education University-Industry Cooperation Collaborative Education Project(220706429013009);China University of Mining & Technology (Beijing) Student Innovation Training Program(202304050)

Corresponding Authors: HAN Peng, E-mail: hanpeng972@163.com;
QIANG Yujie, E-mail: qiangyujie@ustb.edu.cn

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	LIU Zebang
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	QIANG Yujie

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.186 OR https://www.jcscp.org/EN/Y2024/V44/I2/312

Fig.1 Open circuit potentials of Al electrode during immersion in 3.5%NaCl solutions containing different concentrations of 4MP (a), SDS (b) and 4MP + SDS (c) at 25^oC

Fig.2 Polarization curves of Al electrode during immersion in 3.5%NaCl solutions containing different concentrations of 4MP (a), SDS (b) and 4MP + SDS (c) at 25^oC

Inhibitor	Concentration g·L^-1	-E_corr mV	I_corr μA·cm^-2	b_a mV·dec^-1	b_c mV·dec^-1	$η$ / %
Inhibitor free	-	1189.0	9.7479	557.3	285.04	-
4MP	0.025	1129.2	4.0201	737.7	298.4	58.76
	0.375	1126.5	3.4650	245.0	387.2	64.45
	0.500	1044.3	2.2682	489.8	322.8	76.73
	0.625	1008.5	1.4989	335.6	402.2	84.62
	0.750	944.1	1.3597	372.5	330.7	86.05
SDS	0.025	1040.7	3.1141	236.5	599.8	68.05
	0.375	974.9	1.6865	102.1	377.8	82.70
	0.500	967.9	1.5423	263.6	432.8	84.18
	0.625	941.9	1.1793	180.9	434.5	87.90
	0.750	918.8	0.1268	98.4	472.0	88.44
SDS+4MP	0.025	1171.1	1.7146	141.5	177.6	82.41
	0.375	1133.4	1.0031	213.1	299.8	89.71
	0.500	1043.3	0.6456	142.0	149.0	93.38
	0.625	848.0	0.4565	136.7	152.0	95.32
	0.750	986.4	0.6325	95.6	184.3	93.51

Table 1 Fitting parameters of polarization curves of Al electrode during immersion in 3.5%NaCl solutions containing different concentrations of 4MP, SDS and 4MP + SDS at 25^oC

Fig.3 Nyquist plots of Al electrode during immersion in 3.5%NaCl solutions containing different concentrations of 4MP (a), SDS (b) and 4MP + SDS (c) at 25^oC

Fig.4 Equivalent circuit used to ﬁt EIS data

Table 2 Fitting parameters of Nyquist plots of Al electro-de during immersion in 3.5%NaCl solutions containing different concentrations of 4MP, SDS and 4MP + SDS at 25^oC

Table 3 Corrosion rates and corrosion inhibition efficiencies of Al metal in 3.5%NaCl solutions without and with different inhibitors (0.625 g/L)

Fig.5 Surface morphologies of Al metal after corrosion in 3.5%NaCl solutions without (a) and with 0.625 g/L SDS (b), 0.625 g/L 4MP (c) and 0.625 g/L 4MP + SDS (d) inhibitors for 240 h

Fig.6 FT-IR spectra of Al metal after immersion in 3.5%NaCl solutions containing 0.625 g/L 4MP (a), 0.625 g/L SDS (b) and 0.625 g/L 4MP + SDS (c)

Fig.7 Criterions of molecular dynamics equilibrium for the solution/corrosion inhibitor/metal interface model system: variations of temperature (a, c, e, g) and energy (b, d, f, h) with time

Fig.8 Calculated structures of corrosion inhibitors adsorbed on Al metal surfaces based on molecular dynamics simulation under the conditions of corrosion inhibitor free (a, b), and SDS (c, d), 4MP (e, f) and 4MP+SDS (g, h) additions (Side view: a, c, e and g; Top view : b, d, f and h)

Fig.9 Adsorption bonding diagrams of corrosion inhibitors and their compounding systems on metal surface: (a) individual SDS, (b) compound SDS, (c) individual 4MP, (d) compound 4MP

Fig.10 Effect of corrosion inhibitor addition on the distribution of water molecules at the metal/corrosion inhibitor/solution interface

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