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

摘要/Abstract

摘要：

以三聚氯氰、十二胺、乙二胺、N, N-二甲基-1, 3-丙二胺、溴乙烷为原料，合成了三嗪基Gemini表面活性剂（C₁₂-2-C₁₂），并通过傅里叶变换红外光谱、核磁共振氢谱、高分辨质谱对其结构进行了表征。通过静态失重测试、电化学阻抗、动电位极化研究了在60 ℃，3.5% NaCl溶液中C₁₂-2-C₁₂与2-巯基乙醇（TZ）对碳钢缓蚀的协同作用。结果表明，当n（C₁₂-2-C₁₂）∶n（TZ）=7∶3时，复配后缓蚀剂的缓蚀率可达95.47%，缓蚀协同参数为1.52。动电位极化测试结果表明该复配缓蚀剂为混合型缓蚀剂。扫描电子显微镜与X射线光电子能谱仪结果表明，C₁₂-2-C₁₂与TZ共同吸附在碳钢表面，增强了吸附膜的致密性。同时利用分子动力学模拟对其缓蚀机理进行具体阐释。

关键词: 2-巯基乙醇, 三嗪基Gemini表面活性剂, 协同缓蚀, NaCl

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

中图分类号:

TQ423

梁鹏慧, 原梦颖, 阮义蕾, 高国芳, 胡志勇, 朱海林. 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[J]. 日用化学工业（中英文）, 2025, 55(3): 295-304.

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.

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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