磺酸盐表面活性剂的合成及其对碳钢的缓蚀性能

doi:10.3969/j.issn.1001-1803.2021.05.001

摘要/Abstract

摘要：

以三聚氯氰、正辛胺、2-巯基苯并噻唑（MBT）和氨基乙磺酸为原料,合成了一种磺酸盐表面活性剂（COMT）,并采用ESI-MS、¹H NMR、FT-IR对其结构进行了表征。通过表面张力法研究了COMT在3.5% NaCl溶液中的表面活性,通过电化学测试和表面形貌分析研究了其在3.5% NaCl溶液中对45^#碳钢的缓蚀性能。结果表明：在3.5% NaCl溶液中,与MBT相比,COMT对碳钢具有更好的缓蚀性能,当缓蚀剂浓度为4 mmol/L时,COMT对碳钢的缓蚀率可达84.65%,而同等条件下MBT对碳钢的缓蚀率仅为40.63%。量子化学计算和分子动力学模拟结果表明：COMT结构中疏水链、亲水基以及三嗪环的引入增强了其在碳钢表面的吸附能力,这与实验结果具有良好的一致性。

关键词: 磺酸盐表面活性剂, 表面活性, 碳钢, 缓蚀性能

Abstract:

A sulfonate surfactant （COMT） was synthesized from cyanuric chloride, n-octylamine, 2-mercaptobenzothiazole （MBT） and aminoethyl sulfonic acid. Its structure was characterized by ESI-MS,¹H NMR and FT-IR. The surface-active properties of COMT in 3.5% NaCl solution were investigated by surface tension method and its corrosion inhibition performance for 45^# carbon steel in 3.5% NaCl solution was analyzed by electrochemical test and surface morphology analysis. It was found that, compared with MBT, COMT revealed higher inhibition efficiency in 3.5% NaCl solution. The corrosion inhibition efficiency could achieve 84.65% with 4 mmol/L COMT but merely 40.63% for MBT under the same condition. The results of quantum chemical calculation and molecular dynamics simulation showed that, the incorporation of hydrophobic chain, hydrophilic group and triazine ring in the structure of COMT enhanced its adsorption ability on carbon steel surface, which was in good agreement with the experimental results.

Key words: sulfonate surfactant, surface activity, carbon steel, corrosion inhibition

中图分类号:

TQ423.2

朱海林,李晓芬,陆小猛,黄浩宇,王自翔,胡志勇. 磺酸盐表面活性剂的合成及其对碳钢的缓蚀性能[J]. 日用化学工业, 2021, 51(5): 375-382.

ZHU Hai-lin,LI Xiao-fen,LU Xiao-meng,HUANG Hao-yu,WANG Zi-xiang,HU Zhi-yong. Study on the synthesis of a sulfonate surfactant and its corrosion inhibition performance for carbon steel[J]. China Surfactant Detergent & Cosmetics, 2021, 51(5): 375-382.

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缓蚀剂	c/ （mmol·L^-1）	R_s/（Ω·cm²）	C_f/（μF·cm^-2）	R_f/（Ω·cm²）	C_dl/（μF·cm^-2）	R_ct/（Ω·cm²）	R_p/（Ω·cm²）	η/%
空白	0	2.493	267.9	12.64	300.6	86.62	99.26	空白
MBT	1.5	2.598	265.3	10.24	309.2	94.06	104.30	4.83
	3.5	1.531	278.2	15.64	273.5	121.9	137.6	27.86
	4.0	4.296	218.9	18.31	256.4	148.9	167.2	40.63
	8.0	4.519	167.2	25.91	207.2	192.3	218.2	54.51
COMT	1.5	3.643	126.5	32.70	162.8	276.9	309.6	67.94
	3.0	4.283	103.8	35.69	149.7	391.0	426.7	76.74
	3.5	4.159	116.2	51.59	143.9	485.7	537.3	81.53
	4.0	4.967	138.4	62.26	126.2	584.2	646.5	84.65

缓蚀剂	c/（mmol·L^-1）	E_corr/V	I_corr/（μA·cm^-2）	b_a/（V·dec^-1）	b_c/（V·dec^-1）	IE/%
空白	0	-0.802	38.90	0.152	-0.123	空白
MBT	1.5	-0.772	38.23	0.151	-0.109	1.722
	3.5	-0.768	29.51	0.176	-0.124	24.14
	4.0	-0.796	30.20	0.139	-0.114	22.38
	8.0	-0.795	25.70	0.134	-0.119	33.93
COMT	1.5	-0.804	18.62	0.168	-0.108	52.13
	3.0	-0.768	12.91	0.156	-0.116	66.81
	3.5	-0.770	10.12	0.139	-0.102	73.98
	4.0	-0.761	8.59	0.140	-0.109	77.92

介质	w/%
介质	Fe	O	C	N	S
碳钢	96.62±3.91	2.64±0.44	0.74±0.09	—	—
3.5% NaCl	65.99±6.00	31.63±1.68	2.38±0.28	—	—
COMT	87.40±4.81	6.25±1.18	2.82±0.17	1.95±0.72	1.58±0.42

缓蚀剂	E_HOMO/eV	E_LUMO/eV	ΔE/eV	χ/eV	η/eV	ΔN
MBT	-6.482 3	-1.350 2	5.132 1	3.916 3	2.566 0	0.600 9
COMT	-5.915 2	-1.670 6	4.244 6	3.792 9	2.122 3	0.755 6

体系	E_interaction/（kJ·mol^-1）	E_binding/（kJ·mol^-1）
Fe （110） + MBT + H₂O	-389.6	389.6
Fe （110） + COMT+H₂O	-1 204	1 204