A green and effective corrosion inhibitor of functionalized carbon dots

doi:10.1016/j.jmst.2019.05.045

Abstract

Abstract:

In this work, a green and effective corrosion inhibitor of functionalized carbon dots (FCDs) was synthesized by the conjugation of imidazole and citric acid carbon dots (CA-CDs). The corrosion inhibition behavior of FCDs for Q235 steel in 1 M HCl solution was systematically investigated by electrochemical analysis, corrosion morphology and adsorption isotherm. The electrochemical results implied that the as-prepared FCDs inhibitor could effectively suppress the corrosion of Q235 steel in 1 M HCl solution. At the same time, the inhibition efficiency of steel in 1 M HCl solution was more than 90% when the inhibitor concentration exceeded 100 mg/L. This excellent property was attributed to the coverage of adsorption film on the steel surface, which conformed to the Langmuir adsorption model. In addition, the analysis of adsorption isotherm displayed that the adsorption mechanism was the physicochemical interaction at the steel/solution interface.

Key words: Q235 steel, Carbon dots, Adsorption, HCl solution

Yuwei Ye, Dongping Yang, Hao Chen. A green and effective corrosion inhibitor of functionalized carbon dots[J]. J. Mater. Sci. Technol., 2019, 35(10): 2243-2253.

Figures/Tables 15

Fig. 1. Preparation schematic of FCDs.

Fig. 2. FTIR and XPS spectra of FCDs inhibitor: (a) FTIR; (b) XPS-full spectrum; (c) XPS-C 1s; (d) XPS-N 1s.

Fig. 3. TEM and SPM images of CA-CDs, imidazole and FCDs specimens: (a) TEM-CA-CDs; (b) TEM-imidazole; (c) TEM-FCDs; (d) SPM-CA-CDs; (e) SPM-imidazole; (f) SPM-FCDs; (g) Height-CA-CDs; (h) Height- imidazole; (i) Height-FCDs.

Fig. 4. OCP curves of Q235 steel in various test solutions: (a) CA-CDs; (b) imidazole; (c) FCDs.

Fig. 5. EIS images of Q235 steel in various test solutions after 24 h immersion: (a, b, c) CA-CDs; (d, e, f) imidazole; (g, h, i) FCDs.

Fig. 6. Equivalent circuit model of corrosion process.

Table 1 Impedance parameters of Q235 carbon steel in various test solutions.

	Concentration (mg/L)	R_s (Ω cm²)	R_f (Ω cm²)	R_ct (Ω cm²)	CPE_f (μF cm^-2)	CPE_dl (μF cm^-2)	η (%)
	Blank	1.63	4.26	61.61	46.7	377.21	-
CA-CDs	25	1.51	10.36	209.41	23.93	279.51	25.9
	50	1.15	14.89	194.96	20.94	260.12	31.1
	100	1.58	15.68	207.16	16.87	248.28	34.1
	200	1.28	16.24	219.21	13.74	229.56	39.1
Imidazole	25	1.43	15.35	171.42	21.41	141.83	62.4
	50	1.44	16.97	405.13	16.34	104.35	72.3
	100	1.16	17.74	506.41	12.41	82.94	78.1
	200	1.29	19.61	566.8	13.57	65.22	82.7
FCDs	25	1.17	19.64	298.72	16.53	75.12	80.1
	50	1.27	25.85	626.77	11.85	52.43	86.1
	100	2.45	31.57	768.32	9.34	37.33	90.0
	200	2.24	36.82	1108.24	7.38	24.73	93.4

Fig. 7. Tafel curves of Q235 steel after 24 h immersion in various test solutions: (a) CA-CDs; (b) imidazole; (c) FCDs.

Table 2 Corrosion parameters of Q235 steel in various test solutions.

	Concentration (mg/L)	E_corr (V vs. SCE)	i_corr (μA cm^-2)	b_a (V dec^-1)	b_c (V dec^-1)	θ	IE (%)
	Blank	-0.475	256.5	5.477	-8.711	-	-
CA-CDs	25	-0.479	192.6	5.126	-8.113	0.249	24.9
	50	-0.482	177.0	11.772	-9.685	0.310	31.0
	100	-0.473	165.7	9.785	-13.115	0.354	35.4
	200	-0.470	159.0	11.772	-9.658	0.380	38.0
Imidazole	25	-0.484	93.4	10.39	-11.875	0.636	63.6
	50	-0.485	70.4	7.271	-9.505	0.728	72.8
	100	-0.489	54.2	9.326	-11.832	0.789	78.9
	200	-0.496	43.1	9.135	-10.835	0.832	83.2
FCDs	25	-0.478	51.3	6.467	-9.601	0.800	80.0
	50	-0.487	33.1	6.125	-9.415	0.871	87.1
	100	-0.501	21.4	11.759	-10.039	0.917	91.7
	200	-0.509	15.3	15.466	-8.452	0.940	94.0

Fig. 8. Current density distributions of Q235 steel in various test solutions and immersion time: (a) 0%-12 h; (b) CA-CDs-200 mg/L-12 h; (c) imidazole-200 mg/L-12 h; (d) FCDs-200 mg/L-12 h; (e) FCDs-100 mg/L-12 h; (f) FCDs-200 mg/L-24 h.

Fig. 9. Corrosion morphology and element distribution of Q235 steel in various test solutions and immersion time: (a) 0%-24 h; (b) CA-CDs-200 mg/L-24 h; (c) imidazole-200 mg/L-24 h; (d) FCDs-200 mg/L-24 h; (e) FCDs-100 mg/L-24 h; (f) FCDs-200 mg/L-48 h; (g) Fe; (h) C; (i) N.

Fig. 10. 3D morphology of Q235 steel in various test solutions and immersion time: (a) 0%-24 h; (b) CA-CDs-200 mg/L-24 h; (c) imidazole-200 mg/L-24 h; (d) FCDs-200 mg/L-24 h; (e) FCDs-100 mg/L-24 h; (f) FCDs-200 mg/L-48 h.

Fig. 11. Corrosion rate of Q235 steel in various test solutions and immersion time: (a) inhibitor concentration-48 h; (b) immersion time-200 mg/L.

Fig. 12. Langmuir adsorption isotherms of Q235 steel surface in various test solutions: (a) CA-CDs; (b) imidazole; (c) FCDs.

Fig. 13. Protective mechanisms of Q235 steel in various test solutions: (a) CA-CDs; (b) imidazole; (c) FCDs.

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