Inhibition of Zinc Corrosion by Fucoidan in Natural Sea water

doi:10.1007/s40195-016-0524-9

Abstract

Abstract:

Research on corrosion behaviour of zinc in natural sea water without and with fucoidan was carried out by potentiodynamic polarisation test and electrochemical impedance spectroscopy (EIS). The results revealed that fucoidan serves as a good inhibitor for zinc in sea water. Polarisation curves suggested that corrosion potential values shifted to the positive ones after adding inhibitor and fucoidan retards anodic reaction more. Thus, fucoidan can be acted as anodic inhibitor. EIS results showed two phenomena including a charge transfer and an adsorption film. The corrosion inhibition of fucoidan was further confirmed by the scanning electron microscope (SEM) and atomic force microscope (AFM) analysis. Langmuir’s adsorption isotherm was found the appropriate adsorption model.

Key words: Zinc, Polarisation, EIS, AFM, XRD, Anodic protection

Cui Wang, Jie Zhang, Xiao-Lin Chen, Bin Xiang, Ji-Zhou Duan, Bao-Rong Hou. Inhibition of Zinc Corrosion by Fucoidan in Natural Sea water[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(6): 594-599.

Figures/Tables 12

Fig. 1 Chemical structure of fucoidan

Table 1 Parameters of sea water

	Spcond	Salinity	DO nonc (mg/L)	pH	ORP (mV)
Sea water	49.99	32.79	7.46	8.33	32.8

Fig. 2 Polarisation curves for zinc in natural sea water with fucoidan at different concentrations

Fig. 3 XRD pattern of corrosion products on electrode surface after immersed in natural sea water for 7 days

Fig. 4 XRD pattern on electrode surface after deposited at the potential of -1.14 V for two days

Table 2 Potentiodynamic polarisation parameter for zinc in natural sea water with various concentrations of fucoidan at 25 °C

Concentrations	E_corr versus SCE (V)	R_p (Ω cm²)	ηη (%)
Blank	-1.1661	826.65
40 mg L^-1	-1.0609	3206.7	74.22
60 mg L^-1	-1.053	4362.8	81.05
80 mg L^-1	-1.0507	6949.1	88.1
100 mg L^-1	-1.0452	11,711	92.35
120 mg L^-1	-1.0385	10,806	92.94

Fig. 5 Nyquist a, Bode b, c plots of zinc electrode at different concentrations of fucoidan in natural sea water

Fig. 6 Equivalent circuit used to fit the EIS experimental data

Table 3 Impedance parameter for zinc in natural sea water in the absence and presence of different concentrations of fucoidan at 298 K

Parameters	R_s(Ω cm²)	Q₁ 10^-4(Sⁿ/cm²)	n₁	R₁(Ω cm²)	Q₂ 10^-4(Sⁿ/cm²)	n₂	R₂(Ω cm²)	η_(%)
Blank	1.70	1.19	0.724	97.03	160.5	0.380	290.3
40 mg L^-1	1.396	4.26	0.8778	1413	0.094	0.9350	1296	82.75
60 mg L^-1	1.533	2.58	0.8614	2882	0.16	0.9082	1943	90.31
80 mg L^-1	4.675	1.46	0.7455	5519	0.088	0.8846	1845	93.90
100 mg L^-1	3.221	2.57	0.7280	7039	0.18	0.8153	2339	95.02
120 mg L^-1	2.36	4.592	0.7809	3229	0.10	0.9202	2700	92.12

Fig. 7 SEM micrographs of freshly polished zinc sample a; exposed zinc in natural sea water for 7 days b; exposed zinc in natural sea water containing 100 mg L-1 for 7 days at 298 K c

Fig. 8 AFM images of freshly polished zinc sample a; immersed in natural sea water without inhibitor b; immersed in natural sea water with various concentrations of inhibitor c

Fig. 9 Langmuir adsorption plot for zinc in natural sea water containing different concentrations of fucoidan

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