Antimicrobial Adhesion and Anticorrosion Properties of Polypyrrole Film in Natural Seawater†

doi:10.7503/cjcu20150627

Abstract

Abstract:

Polypyrrole was deposited on the surface of the 316L stainless steel electrode through galvanostatic method, and the antifouling property of the polypyrrole film in natural seawater was analyzed via open circuit potential, biological microscope, Tafel polarization curve and electrochemical impedance spectroscopy. It was found that the open circuit potential of the stainless steel electrode coated with polypyrrole was stable after 20 d of the immersion in the natural seawater, which indicates that the polypyrrole had a good ability to prevent the microorganism from attaching. This can be confirmed by the biological microscope. And the corrosion current density maintained at 10^-7 mA/cm² and showed good anticorrosion performance. The anticorrosion efficiency can still reach up 97.45% even the electrode is immersed in natural seawater for 50 d. Therefore, it could be concluded that the polypyrrole synthesized by electrochemical method exhibited good properties in the prevention of microbial attachment and good anticorrosion performance.

Key words: Polypyrrole film, Microbial attachment, Anticorrosion, Natural seawater

CLC Number:

O631

TrendMD:

MA Xiaodan, ZHANG Zhiming, YU Liangmin. Antimicrobial Adhesion and Anticorrosion Properties of Polypyrrole Film in Natural Seawater^†[J]. Chem. J. Chinese Universities, 2016, 37(2): 373.

Figures/Tables 13

Fig.1 FTIR spectrum of polypyrrole

Fig.2 X-Ray diffraction pattern of polypyrrole

Fig.3 Open circuit potentials of 316L stainless steel(SS) electrode(A) and 316L SS electrode coated with polypyrrole(B) immersed in natural(a) and sterile seawater(b)

Fig.4 Open circuit potential of 316L SS electrode(A) and 316L SS electrode coated with polypyrrole(B) immersed in natural seawater after being treated under ultrasound

Fig.5 Biological microscope images of bare electrode(A, C) and sample electrode(B, D) after being immersed in natural seawater for 3 d(A, B) and 50 d(C, D)

Table 1 Fitting data of the 316 L SS electrode/316L SS electrode coated with polypyrrole immersed in natural seawater

Time	E_corr/V		i_corr/(mA·cm^-2)		η(%)
Time	316L SS electrode	Sample electrode	316L SS electrode	Sample electrode	316L SS electrode	Sample electrode
2 h	-0.4447	-0.3026	6.365×10^-6	1.352×10^-7		97.88
5 d	-0.3113	-0.3038	1.006×10^-6	1.143×10^-7	84.19	98.20
15 d	-0.3033	-0.3065	3.422×10^-7	1.351×10^-7	94.62	97.88
25 d	-0.0411	-0.3838	2.131×10^-8	1.294×10^-7	99.67	97.97
35 d	-0.5872	-0.3762	3.651×10^-6	1.681×10^-7	42.64	97.36
50 d	-0.7713	-0.3679	6.429×10^-5	1.620×10^-7	Corroded	97.45

Fig.6 Polarization curves of 316 L SS(A)/316 L SS electrode coated with polypyrrole(B) electrode immersed in natural seawater for different time

Fig.7 EIS of 3l6 L SS electrode immersed in natural seawater for 50 d for Nyquist polts(A), Bode magnitude polts(B) and Bode phase angle plots(C)

Fig.8 Equivalent circuit of 316 L SS electrode immersed in natural seawater 2 h—15 d(A) and 25—50 d(B)

Table 2 EIS fitting data of 316 L SS electrode immersed in natural seawater

Time	R_s/(Ω·cm²)	R_p/(kΩ·cm²)	Q_p/μF	10⁴W/Ω
2 h	6.25	3.6	186	—
5 d	6.02	28.5	163	—
15 d	7.61	35.7	241	—
25 d	14.90	12.0	129	3.72
35 d	4.93	9.89	12.0	2.32
50 d	7.31	6.50	21.5	5.45

Fig.9 EIS of 316 L SS electrode coated with polypyrrole immersed in natural seawater for different time (A) Nyquist polts; (B) Bode magnitude polts; (C) Bode phase angle plots.

Fig.10 Equivalent circuit of 316 L SS electrode coated with polypyrrole immersed in natural seawater

Table 3 EIS fitting data of 316 L SS electrode coated with polypyrrole immersed in natural seawater

Time	R_s/(Ω·cm²)	R_p/(kΩ·cm²)	Q_p/μF	10⁶W/Ω
2 h	6.04	0.82	38.8	18.2
5 d	9.48	1.10	39.0	6.15
15 d	9.78	1.80	27.3	1.74
25 d	9.96	2.40	27.1	1.33
35 d	9.97	3.10	27.0	1.08
50 d	11.20	5.20	23.4	387

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