Corrosion Inhibition of Q235 Steel by Octyl Dimethyl Benzyl Quaternary Ammonium Salt Ionic Liquid†

doi:10.7503/cjcu20180453

Abstract

Abstract:

The self-made octyl dimethyl benzyl quaternary ammonium ionic liquid(ODBA) was synthesized and its corrosion inhibitory property for Q235 steel in 1 mol/L HCl solution was studied by means of mass loss measurement, polarization curve, electrochemical impedance spectroscopy(EIS), and scanning electron microscopy(SEM) and its adsorption behavior on carbon steel surface was analyzed. The mass loss results show that the inhibition efficiencies increased with the increase of ODBA concentration. When the mass concentration was 0.2 g/L and the temperature was 30 ℃, the inhibition efficiency could reach 95.53%. ODBA is a mixed type inhibitor and preferentially inhibit the anodic reaction. The results of electrochemical test were consistent with that of mass loss test. Thermodynamic and activation energy parameters were discussed. Adsorption of ODBA was found to follow the Langmuir’s adsorption isotherm. It belongs to the mixed adsorption based on chemical adsorption. Adsorption of ODBA on steel surfaces is spontaneous and exothermic, accompanied by an increase in entropy. Thermogravimetric analysis(TGA) shows that ODBA has good thermostability.

Key words: Ionic liquid, Corrosion inhibitor, Polarization curve, Adsorption

CLC Number:

O646

TrendMD:

ZHANG Guanghua,DONG Qiuchen,ZHANG Wanbin,WANG Shuang. Corrosion Inhibition of Q235 Steel by Octyl Dimethyl Benzyl Quaternary Ammonium Salt Ionic Liquid^†[J]. Chem. J. Chinese Universities, 2019, 40(1): 130.

Figures/Tables 16

Fig.1 1H NMR spectrum of ODBA

Fig.2 FTIR spectrum of ODBA

Fig.3 Thermogravimetric analysis curve of ODBA

Table 1 Corrosion rate of mild steel and inhibition efficiency of various concentrations of ODBA in 1 mol/L HCl at different temperature obtained from mass loss measurements

Temperature/℃	c(ODBA)/ (g·L^-1)	V/ (mg·cm^-2·h^-1)	θ	η(%)	Temperature/℃	c(ODBA)/ (g·L^-1)	V/ (mg·cm^-2·h^-1)	θ	η(%)
30	0	1.6509		——	40	0.2	0.1655	0.93	92.88
	0.08	0.1547	0.91	90.63		0.3	0.1424	0.94	93.87
	0.1	0.1126	0.93	93.18		0.5	0.1068	0.95	95.41
	0.2	0.0738	0.96	95.53	50	0	3.6317	——	——
	0.3	0.0601	0.96	96.36		0.08	0.6018	0.83	83.43
	0.5	0.0476	0.97	97.11		0.1	0.5287	0.11	85.44
40	0	2.3250	——	——		0.2	0.3924	0.33	89.20
	0.08	0.3057	0.87	86.85		0.3	0.2985	0.51	91.78
	0.1	0.2614	0.89	88.77		0.5	0.2512	0.84	93.08

Fig.4 Relationship between inhibition efficiency and temperature at different concentrations of ODBA

Fig.5 Potentiodynamic polarization curves for mild steel in 1 mol/L HCl with different concentrations of ODBA at 30 ℃

Table 2 Electrochemical parameters for the corrosion of mild steel in 1 mol/L HCl solution containing different concentrations of ODBA at 30 ℃

c(ODBA)/(g·L^-1)	E_corr/mV	i_corr/(mA·cm^-2)	β_a/(mV·dec^-1)	β_c/(mV·dec^-1)	η(%)
0	-419.1	1.8757	83	-140	——
0.08	-395.7	0.3845	523	-172	79.50
0.1	-394.9	0.2721	614	-171	85.49
0.2	-390.3	0.2010	605	-169	89.28
0.3	-383.7	0.1315	508	-187	92.99
0.5	-385.3	0.0236	637	-174	98.74

Fig.6 Nyquist plots(A) and equivalent circuit model(B) for mild steel in 1 mol/L HCl solution in the absence and in the presence of different concentrations of ODBA at 30 ℃The inset shows the enlarged plot of blank system.

Table 3 Impedance parameters for mild steel in 1 mol/L HCl in the absence and in the presence of different concentrations of ODBA at 30 ℃

c(ODBA)/(g·L^-1)	R_s/(Ω·cm²)	R_ct/(Ω·cm²)	C_dl/(μF·cm^-2)	n	η(%)
0	0.63	5.7	543.3	0.80	——
0.08	0.76	59.7	148.3	0.71	90.45
0.1	0.56	63.2	192.6	0.69	90.98
0.2	0.74	90.1	224.5	0.66	93.67
0.3	1.24	104.3	329.8	0.65	94.74
0.5	1.50	124.8	127.5	0.65	95.43

Fig.7 Langmuir adsorption isotherm fitting for ODBA at Q235 steel surface

Table 4 Adsorption parameters obtained from mass loss measurements for the studied compound in 1 mol/L HCl at different temperatures

Temperature/℃	K_ads/(L·mol^-1)	Δ $G ads 0$ /(kJ·mol^-1)	Δ $H ads 0$ /(kJ·mol^-1)	Δ $S ads 0$ /(J·mol^-1·K^-1)
30	42409	-36.96	——	18.38
40	25265	-36.84	-31.39	17.41
50	19936	-37.37		18.51

Table 4 Adsorption parameters obtained from mass loss measurements for the studied compound in 1 mol/L HCl at different temperatures

Temperature/℃	K_ads/(L·mol^-1)	Δ $G ads 0$ /(kJ·mol^-1)	Δ $H ads 0$ /(kJ·mol^-1)	Δ $S ads 0$ /(J·mol^-1·K^-1)
30	42409	-36.96	——	18.38
40	25265	-36.84	-31.39	17.41
50	19936	-37.37		18.51

Fig.8 Relationship between lnKads and 1/T for ODBA inhibiting mild steel

Fig.9 Arrhenius plots for mild steel in 1 mol/L HCl without and with ODBA

Table 5 Calculated thermodynamic parameters of adsorption from mass loss measurements

c(ODBA)/(g·L^-1)	E_a/(kJ·mol^-1)	ΔH_a/(kJ·mol^-1)	ΔS_a/(kJ·mol^-1)
0	9.93	-30.16	-334.58
0.3	20.19	-64.05	-466.88

Fig.10 Plots of lg(V/T) versus 1/T for mild steel in 1 mol/L HCl without and with ODBA

Fig.11 SEM images for Q235 steel after 4 h immersion at 30 ℃ in 1 mol/L HCl solution in the absence(A) and in the presence(B) of 0.2 g/L ODBA

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