天然海水中聚吡咯膜的防微生物附着及防腐蚀性能

doi:10.7503/cjcu20150627

摘要/Abstract

摘要：

采用恒电流法在316 L不锈钢电极表面合成聚吡咯(PPy), 通过开路电位、生物显微镜(BM)、 Tafel极化曲线及电化学交流阻抗(EIS)研究了聚吡咯防止微生物附着及防腐蚀特性. 研究表明, 沉积聚吡咯的316 L不锈钢电极浸泡在天然海水中(0~20 d), 开路电位基本保持不变, 表明电化学合成的聚吡咯膜有良好的防止微生物附着能力, 并通过生物显微镜进行了验证, 且在浸泡的过程中其腐蚀电流密度维持在10^-7 mA/cm², 表现出良好的防腐蚀特性; 浸泡50 d后, 其防腐蚀效率仍高达97.45%. 因此, 电化学合成的聚吡咯具有优异的防止微生物附着和防腐蚀特性.

关键词: 聚吡咯膜, 微生物附着, 防腐性能, 天然海水

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

中图分类号:

O631

TrendMD:

马晓丹, 张志明, 于良民. 天然海水中聚吡咯膜的防微生物附着及防腐蚀性能. 高等学校化学学报, 2016, 37(2): 373.

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

图/表 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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