三嗪基Gemini表面活性剂在0.5 mol/L H2SO4中对45#碳钢的缓蚀性能研究

doi:10.3969/j.issn.2097-2806.2024.10.001

Abstract

Abstract:

The triazinyl Gemini surfactants with different hydrophobic chain lengths （C_m-2-C_m, m=6, 8, 12） were synthesized by using cyanuric chloride, hexylamine/octylamine/dodecylamine, ethylenediamine,N, N-dimethyl-1, 3-propanediamine and bromoethane as raw materials. The molecular structure was characterized by FT-IR, ¹H NMR and ESI-MS. The surface activities of the three triazinyl Gemini surfactants （C₆-2-C₆, C₈-2-C₈and C₁₂-2-C₁₂） were investigated by surface tension method. Their corrosion-inhibition properties on 45^# carbon steel in 0.5 mol/L H₂SO₄ were studied by static weight loss method, electrochemical impedance spectroscopy, potentiodynamic polarization and quantum chemistry. The results showed that, when the carbon number of hydrophobic chain was increased from 6 to 12, the critical micelle concentration （cmc） of the triazinyl Gemini surfactant was decreased from 0.059 mmol/L to 0.013 mmol/L, and meanwhile the pc₂₀value was increased from 1.23 to 1.89. The results of electrochemical impedance showed that, the corrosion inhibition efficiency increased with the increase of carbon number of hydrophobic chain for the surfactants at the same concentration. The inhibition efficiency could reach 95.03% for 45^# carbon steel in 0.5 mol/L H₂SO₄ when adding 0.2 mmol/L C₁₂-2-C₁₂. The results of potentiodynamic polarization showed that the three surfactants were mixed corrosion inhibitors which mainly inhibited the cathode. These three triazinyl Gemini surfactants could effectively adsorb on the carbon steel surface, as shown by the results of quantum chemical calculation.

Key words: triazinyl Gemini surfactant, corrosion inhibition performance, carbon steel, H₂SO₄solution

CLC Number:

TQ423

Mengying Yuan, Dehua Wang, Huikai Nan, Tao Geng, Hongyi Liu, Hailin Zhu. Corrosion-inhibiting effects of triazinyl Gemini surfactants on carbon steel in aqueous solution containing 0.5 mol/L H₂SO₄[J].China Surfactant Detergent & Cosmetics, 2024, 54(10): 1145-1154.

Figures/Tables 12

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References 29

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Inhibitor	cmc/（mmol/L）	γ_cmc/ （mN/m）	π_cmc/ （mN/m）	Γ_max×10^-8/ （mol/cm²）	A_min×10⁴/nm²	pc₂₀
C₆-2-C₆	0.059	47.89	23.91	9.54	1.74	1.23
C₈-2-C₈	0.025	45.77	26.03	7.12	2.33	1.60
C₁₂-2-C₁₂	0.013	43.09	28.71	8.01	2.07	1.89

Inhibitor	c/ （mmol/L）	C_R/ （g/（cm²·h））	θ	η_w/ %
	0	1.950	—	—
C₆-2-C₆	0.001	1.494	0.23	23.40
	0.010	0.984	0.50	49.53
	0.100	0.555	0.72	71.57
	0.200	0.387	0.80	80.18
C₈-2-C₈	0.001	1.296	0.34	33.55
	0.010	0.908	0.53	53.44
	0.100	0.445	0.77	77.19
	0.200	0.326	0.83	83.29
C₁₂-2-C₁₂	0.001	1.053	0.46	46.01
	0.010	0.855	0.56	56.15
	0.100	0.364	0.81	81.33
	0.200	0.133	0.93	93.18

Inhibitor	c/ （mmol/L）	R_s/ （Ω·cm²）	C_f/ （μF/cm²）	n₁	R_f/ （Ω·cm²）	C_dl/ （μF/cm²）	n₂	R_ct/ （Ω·cm²）	R_p/ （Ω·cm²）	η_eis/%
C₆-2-C₆	0	1.97	118.10	1	2.42	269.71	0.600 0	20.43	22.85	—
	0.001	1.75	44.45	1	6.88	62.17	0.745 5	48.28	55.16	58.57
	0.01	1.88	31.75	1	4.38	68.58	0.766 9	80.19	84.57	72.98
	0.1	1.87	33.41	1	8.40	52.81	0.775 7	105.70	114.10	79.97
	0.2	1.82	23.12	1	15.89	57.41	0.717 1	159.20	175.09	86.94
C₈-2-C₈	0	2.27	50.42	0.97	2.90	133.25	0.699 7	27.82	30.72	—
	0.001	2.19	41.93	1	6.63	99.13	0.678 2	75.30	81.93	62.50
	0.01	1.70	31.75	1	8.72	72.21	0.696 3	111.40	120.12	74.43
	0.1	2.10	25.39	1	9.27	47.41	0.744 3	276.22	285.47	89.24
	0.2	1.95	34.58	1	20.12	41.52	0.741 1	336.14	356.22	91.38
C₁₂-2-C₁₂	0	1.73	76.32	0.93	3.88	12.73	0.650 2	14.00	17.88	—
	0.001	1.84	40.03	1	5.21	8.72	0.737 4	52.68	57.89	69.11
	0.01	1.97	41.93	1	6.73	5.06	0.729 4	93.53	100.26	82.16
	0.1	2.04	23.38	1	10.68	4.69	0.742 6	306.90	317.58	94.37
	0.2	2.19	25.82	1	13.50	3.95	0.765 9	346.10	359.61	95.03

Inhibitor	c/（mmol/L）	E_corr/V	i_corr/（μA/cm²）	b_a/（V/dec）	b_c/（V/dec）	η_pp/%
C₆-2-C₆	0	-0.438	0.438	81.168	-161.25	—
	0.001	-0.430	0.277	72.622	-167.09	36.76
	0.010	-0.425	0.195	69.264	-153.57	55.48
	0.100	-0.426	0.108	63.254	-119.66	75.34
	0.200	-0.427	0.063	58.731	-128.43	85.59
C₈-2-C₈	0	-0.446	0.613	88.215	-168.28	—
	0.001	-0.454	0.344	82.320	-161.36	43.88
	0.010	-0.460	0.052	58.552	-88.97	91.48
	0.100	-0.515	0.044	55.195	-82.24	92.87
	0.200	-0.475	0.016	54.722	-79.40	97.37
C₁₂-2-C₁₂	0	-0.441	0.576	83.547	-145.54	—
	0.001	-0.417	0.193	68.103	-125.97	66.49
	0.010	-0.432	0.028	53.645	-100.15	95.09
	0.100	-0.474	0.016	51.043	-72.79	97.17
	0.200	-0.463	0.009	49.511	-71.88	98.52

Inhibitor	E_HOMO/eV	E_LUMO/eV	ΔE/eV	Χ/eV	η/eV	ΔN
C₆-2-C₆	-8.753 0	-4.496 2	4.256 8	6.624 6	2.128 4	0.088 2
C₈-2-C₈	-8.437 4	-4.213 3	4.224 2	6.325 6	2.112 1	0.159 7
C₁₂-2-C₁₂	-7.988 6	-3.756 3	4.232 3	5.872 5	2.116 2	0.266 4

Corrosion-inhibiting effects of triazinyl Gemini surfactants on carbon steel in aqueous solution containing 0.5 mol/L H₂SO₄

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Corrosion-inhibiting effects of triazinyl Gemini surfactants on carbon steel in aqueous solution containing 0.5 mol/L H2SO4

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Corrosion-inhibiting effects of triazinyl Gemini surfactants on carbon steel in aqueous solution containing 0.5 mol/L H₂SO₄