含噻二唑季铵盐表面活性剂对Q235钢的缓蚀性能

doi:10.3969/j.issn.1001-1803.2022.08.001

摘要/Abstract

摘要：

通过表面张力法研究一种含噻二唑季铵盐表面活性剂（MTOTB）在1 mol/L HCl溶液中的表面活性;通过电化学测试、静态失重和表面形貌分析研究MTOTB及相应的2-巯基-5-甲基-1,3,4-噻二唑（MMTD）在1 mol/L HCl溶液中对Q235碳钢的缓蚀性能。结果表明,MTOTB在1 mol/L HCl溶液中的临界胶束浓度为0.36 mmol/L;当添加浓度为0.5 mmol/L时,MTOTB对在1 mol/L HCl溶液中浸泡48 h碳钢片的缓蚀率可达95.34%,同样条件下,MMTD对碳钢的缓蚀率为78.34%,说明MTOTB对碳钢的腐蚀抑制效率显著优于MMTD。SEM-EDS表明,MTOTB可以吸附在碳钢表面,有效抑制碳钢片的腐蚀。

关键词: 噻二唑, 季铵盐表面活性剂, 表面活性, Q235钢, 缓蚀性能

Abstract:

The surface activity of a quaternary ammonium surfactant （MTOTB） in 1 mol/L HCl solution was investigated by surface tension method. The corrosion inhibition performance of MTOTB and 2-mercapto-5-methyl-1, 3, 4-thiadiazole （MMTD） for Q235 carbon steel in 1 mol/L HCl solution was analyzed by electrochemical test, weight loss and surface morphology analysis. The results show that, the critical micelle concentration is 0.36 mmol/L for MTOTB in 1 mol/L HCl solution. The corrosion inhibition rate can reach 95.34% for the carbon steel soaked in 1 mol/L HCl solution for 48 h when adding 0.5 mmol/L MTOTB, while for MMTD it is 78.34% under the same condition, suggesting that MTOTB owns better corrosion inhibition performance than MMTD. The results of SEM-EDS show that MTOTB can adsorb on the surface of carbon steel and effectively inhibit the corrosion of carbon steel sheet.

Key words: thiadiazole, quaternary ammonium surfactant, surface activity, Q235 carbon steel, corrosion inhibition performance

中图分类号:

TG174.4

王俊霞,刘建华,陆小猛,孙永强,胡志勇,朱海林. 含噻二唑季铵盐表面活性剂对Q235钢的缓蚀性能[J]. 日用化学工业, 2022, 52(8): 797-804.

Wang Junxia,Liu Jianhua,Lu Xiaomeng,Sun Yongqiang,Hu Zhiyong,Zhu Hailin. Corrosion inhibition effect of a quaternary ammonium surfactant containing thiadiazole on Q235 steel[J]. China Surfactant Detergent & Cosmetics, 2022, 52(8): 797-804.

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c/ （mmol/L）	MTOTB		MMTD
c/ （mmol/L）	v_R/ [mg/ （cm²·h）]	η_W/%	v_R/ [mg/ （cm²·h）]	η_W/%
0	1.607	—	1.607	—
0.001	1.357	15.52	1.440	10.36
0.01	0.867	46.03	0.877	45.44
0.1	0.174	89.15	0.458	71.48
0.2	0.140	91.26	0.472	70.61
0.5	0.075	95.34	0.348	78.34
1.0	0.068	95.78	0.306	80.97

	c/ （mmol/L）	R_s/ （Ω·cm²）	C_f/ （μF/cm²）	R_f/ （Ω·cm²）	C_dl/ （μF/cm²）	R_ct/ （Ω·cm²）	R_p/ （Ω·cm²）	η_eis/%
MTOTB	0	1.366	49.23	4.79	79.28	20.41	25.20	—
	0.01	1.221	33.70	11.57	29.56	33.12	44.69	43.61
	0.1	1.251	18.43	15.16	16.62	162.00	177.16	85.76
	0.2	1.234	18.33	18.97	16.52	225.40	244.37	89.69
	0.5	1.213	15.46	11.54	28.50	328.10	339.64	92.58
	1.0	1.218	14.46	14.43	25.46	407.80	422.23	94.03
MMTD	0.01	0.010	0.59	1.00	16.50	33.81	34.81	27.61
	0.1	0.020	0.35	1.23	19.58	39.38	40.61	37.95
	0.2	0.010	0.24	1.26	16.28	80.62	81.88	69.92
	0.5	0.010	0.44	1.04	9.61	123.00	124.04	79.68
	1.0	0.057	0.37	1.00	5.56	145.20	146.20	82.76

	c/（mmol/L）	E_corr/V	i_corr / （μA/cm²）	b_a/ （V/dec）	b_c/ （V/dec）	η_p/%
MTOTB	0	-0.428	338.32	0.079	-0.131	—
	0.01	-0.451	207.11	0.087	-0.152	38.78%
	0.1	-0.446	72.81	0.074	-0.129	78.48%
	0.2	-0.433	37.51	0.058	-0.122	88.91%
	0.5	-0.431	26.44	0.054	-0.117	92.18%
	1.0	-0.435	23.00	0.046	-0.114	93.20%
MMTD	0.01	-0.442	283.12	0.058 9	0.089 9	16.32%
	0.1	-0.448	200.16	0.059 5	0.093 7	40.84%
	0.2	-0.445	156.18	0.068 8	0.108 2	53.84%
	0.5	-0.444	72.60	0.088 4	0.135	78.54%
	1.0	-0.446	48.12	0.095 5	0.122	85.78%