三嗪基Gemini表面活性剂与2-巯基乙醇在3.5% NaCl中对碳钢的缓蚀协同效应研究

doi:10.3969/j.issn.2097-2806.2025.03.004

Abstract

Abstract:

The triazine-based Gemini surfactant C₁₂-2-C₁₂ was synthesized with cyanuric chloride, dodecylamine, ethylenediamine, N,N-dimethyl-1, 3-propanediamine and ethyl bromide as raw materials. The structure of the product was characterized by Fourier transform infrared spectroscopy, ¹H NMR and high-resolution mass spectrometry. The synergistic effect of C₁₂-2-C₁₂and 2-mercaptoethanol （TZ） on corrosion inhibition of carbon steel in 3.5% NaCl solution at 60 ℃ was investigated by static weight loss test, electrochemical impedance spectroscopy （EIS）, and potentiodynamic polarization test. The results showed that, the corrosion inhibition rate could reach 95.47% when n（C₁₂-2-C₁₂） ∶n（TZ） = 7∶3, and the synergistic parameter of corrosion inhibition was 1.52. The potentiodynamic polarization curves indicated that the mixed corrosion inhibitors in 3.5% NaCl solution behaved like a hybrid corrosion inhibitor. The results of scanning electron microscopy and X-ray photoelectron spectroscopy showed that the presence of TZ could complement the adsorption sites of C₁₂-2-C₁₂ on the surface of carbon steel and enhance the denseness of the adsorption film, thus enhancing the corrosion inhibition performance. Molecular dynamics simulations were used to specifically elucidate the corrosion inhibition mechanism, which proved that there was good synergistic corrosion inhibition effect. This work would be expected to improve the ability of corrosion inhibitors to act in harsh environments and prolong the protective period.

Key words: 2-mercaptoethanol, triazine-based Gemini surfactant, synergistic corrosion inhibition, NaCl

CLC Number:

TQ423

Penghui Liang, Mengying Yuan, Yilei Ruan, Guofang Gao, Zhiyong Hu, Hailin Zhu. Synergistic effect of triazine-based Gemini surfactant and 2-mercaptoethanol on corrosion inhibition of carbon steel in 3.5%NaCl solution[J].China Surfactant Detergent & Cosmetics, 2025, 55(3): 295-304.

Figures/Tables 17

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References 30

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Inhibitor	C_R/（g/（cm²·h））	θ	η/%	S
3.5% NaCl	0.015 1
n（C₁₂-2-C₁₂）∶n（TZ）=0∶10	0.005 4	0.64	64.04
n（C₁₂-2-C₁₂）∶n（TZ）=3∶7	0.001 3	0.91	91.45	0.81
n（C₁₂-2-C₁₂）∶n（TZ）=5∶5	0.000 9	0.94	94.16	1.18
n（C₁₂-2-C₁₂）∶n（TZ）=7∶3	0.000 7	0.95	95.47	1.52
n（C₁₂-2-C₁₂）∶n（TZ）=10∶0	0.002 9	0.81	80.79

Inhibitor	R_s/ （Ω·cm²）	C_f/ （mF/cm²）	n₁	R_f/ （Ω·cm²）	C_dl/ （mF/cm²）	n₂	R_ct/ （Ω·cm²）	R_p/ （Ω·cm²）	η_eis/%	S
3.5% NaCl	3.64	9.20	0.76	7.10	65.48	0.60	189.65	196.75
n（C₁₂-2-C₁₂）∶n（TZ）=0∶10	3.07	77.57	0.53	16.25	46.65	1.00	436.10	452.35	56.51
n（C₁₂-2-C₁₂）∶n（TZ）=3∶7	3.38	10.09	0.71	23.46	49.45	0.60	1 082.00	1 105.46	82.20	0.93
n（C₁₂-2-C₁₂）∶n（TZ）=5∶5	3.37	9.53	0.70	20.30	33.49	0.56	1 853.00	1 873.30	89.50	1.57
n（C₁₂-2-C₁₂）∶n（TZ）=7∶3	4.17	9.05	0.74	22.37	25.35	0.52	2 101.00	2 123.37	90.73	1.78
n（C₁₂-2-C₁₂）∶n（TZ）=10∶0	3.34	20.54	0.66	19.81	63.85	0.57	499.10	518.91	62.08

Inhibitor	E_corr/V	I_corr/（μA/cm²）	b_a/（V/dec）	b_c/（V/dec）	η_pp/%	S
3.5%NaCl	-0.937	272.86	497.75	-159.88
n（C₁₂-2-C₁₂）∶n（TZ）=0∶10	-0.923	101.50	256.49	-113.14	62.80
n（C₁₂-2-C₁₂）∶n（TZ）=3∶7	-0.930	43.40	252.24	-172.94	84.09	0.86
n（C₁₂-2-C₁₂）∶n（TZ）=5∶5	-0.978	34.45	228.12	-162.85	87.37	1.08
n（C₁₂-2-C₁₂）∶n（TZ）=7∶3	-0.881	26.20	120.13	-141.86	90.40	1.42
n（C₁₂-2-C₁₂）∶n（TZ）=10∶0	-0.956	100.18	245.40	-124.24	63.29

	Fe	O	C	N	S
n（C₁₂-2-C₁₂）∶n（TZ）=0∶10	85.56±0.13	8.73±0.11	5.57±0.12		0.14±0.05
n（C₁₂-2-C₁₂）∶n（TZ）=7∶3	89.75±0.14	3.37±0.05	6.24±0.12	0.45±0.08	0.19±0.02
n（C₁₂-2-C₁₂）∶n（TZ）=10∶0	84.41±0.14	8.02±0.05	7.22±0.12	0.35±0.08

	n（C₁₂-2-C₁₂）∶n（TZ）=0∶10		n（C₁₂-2-C₁₂）∶n（TZ）=7∶3		n（C₁₂-2-C₁₂）∶n（TZ）=10∶0
Elements	Assignment	Position/eV	Assignment	Position/eV	Assignment	Position/eV
C 1s	C-C	284.35	C-C	284.40	C-C	284.65
	C-S	285.90	C-S/C-N	285.51	C-N	286.04
	C=O	287.95	C=O	287.10	C=O	287.55
N 1s			C=N	398.03	C=N	398.17
			N-Fe	399.21	N-Fe	399.38
			C-N⁺	401.83	C-N⁺	402.10
S 2p	Fe-S	161.81	Fe-S	161.50
S 2p	S-C	167.66	S-C	167.38

Synergistic effect of triazine-based Gemini surfactant and 2-mercaptoethanol on corrosion inhibition of carbon steel in 3.5%NaCl solution

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