Effect of Nafion Film on Corrosion Resistance and Electric Field Response of Marine Electric Field Electrode

doi:10.11902/1005.4537.2018.151

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (6): 581-587 DOI: 10.11902/1005.4537.2018.151

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Effect of Nafion Film on Corrosion Resistance and Electric Field Response of Marine Electric Field Electrode

WANG Zechen,LIN Jun(

),YANG Guoqing,LIANG Shangqing

College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310037, China

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Abstract

Aiming at the problem that the conventional Ag/AgCl marine electric field electrode is susceptible to Br^-, I^- corrosion in seawater, this paper proposes a novel replacement, which composed of PVC+NaCl as the solid electrolyte layer and Nafion film as the protective layer. Compared with the conventional Ag/AgCl electrode, the new electrode presents not only the same grade of responsiveness to the electric field, but also higher stability and corrosion resistance. The electrode can accurately respond to electric field signals at frequencies of 1, 0.1 and 0.01 Hz, correspondingly the linearity is 2.163%, 4.356% and 6.720%, respectively, while the intrinsic noise of the new electrode can be as low as 14.037 $n V / H z$ .

Key words: Ag/AgCl electrode Nafion membrane modified electrode electric field response performance electrode corrosion

Received: 17 October 2018

ZTFLH:

TJ43.1

Fund: Natural Science Foundation of Zhejiang Province(LQ16B070001);Natural Science Foundation of Zhejiang Province(LY17B060012)

Corresponding Authors: Jun LIN E-mail: junlin@hdu.edu.cn

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WANG Zechen, LIN Jun, YANG Guoqing, LIANG Shangqing. Effect of Nafion Film on Corrosion Resistance and Electric Field Response of Marine Electric Field Electrode. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 581-587.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.151 OR https://www.jcscp.org/EN/Y2019/V39/I6/581

Table 1 Formula of artificial sea water

Fig.1 Device for the test of potential change

Fig.2 Device for the test of electric field response

Fig.3 Device for the test of electrochemical self-noise

Fig.4 Relative potentials of the testing electrodes to the calomel electrode during the corrosion process

Fig.5 SEM images (a1~d1) and EDS results (a2~d2) of the electrode A1 (a1, a2), A2 (b1, b2), B1 (c1, c2) and B2 (d1, d2)

Table 2 Changes of element contents on the electrode surfaces before and after corrosion (mass fraction / %)

Fig.6 Response voltages of the electrode to 1 Hz (a), 0.1 Hz (b) and 0.01 Hz (c) signals

Table 3 Response linearity and sensitivity of the modified electrode, unmodified electrode and blank control electrode to the electric field signals with the frequencies of 1, 0.1 and 0.01 Hz

Fig.7 Self-noises of the testing system,modified electrode (group A), unmodified electrode (group B) and blank control electrode (group C)

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