Light-generated Cathodic Protection Properties of Fe2O3/TiO2 Nanocomposites for 304 Stainless Steel

doi:10.11902/1005.4537.2017.210

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (1): 36-42 DOI: 10.11902/1005.4537.2017.210

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Light-generated Cathodic Protection Properties of Fe₂O₃/TiO₂ Nanocomposites for 304 Stainless Steel

Tong LIAO^1,^2,³,Zheng MA^1,³,Leilei LI^1,³,Xiumin MA^1,³,Xiutong WANG^1,³,Baorong HOU^1,³(

)

1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Open Studio for Marine Corrosion and Protection, Qingdao Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China

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Abstract

Fe₂O₃/TiO₂ nanocomposites were fabricated by chemical bath deposition on the surface of the TiO₂ nanotubes, which had been prepared on titanium foil via anodic oxidation method. Their morphology, phase constituent, composition, and light response were characterized by scanning electron microscopy (SEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible diffuse reflection spectrum (UV-vis DRS). Photoelectric properties of the nanocomposites were assessed by measuring open circuit potential (OCP) under intermittent illumination and photocurrent density versus time (i-t), as well as electrochemical impedance spectroscopy (EIS). Results indicate that the incorporation of Fe₂O₃ increases the utilization efficiency of visible light and strengthens the cathodic protection performance of the TiO₂ nanotubes. In visible light, the open circuit potential of Fe₂O₃/TiO₂ nanocomposite prepared in the bath of 0.05 mol/L Fe(NO₃)₃ is -740 mV, about 300 mV lower than that of the ordinary TiO₂ nanotubes, a better cathodic protection effect for 304 stainless steel.

Key words: photocathode protection Fe₂O₃/TiO₂ nanocomposite 304 stainless steel

Received: 13 December 2017

ZTFLH:

TG174

Fund: Supported by National Basic Research Program of China((2014CB643304));Strategic Priority Research Program of the Chinese Academy of Sciences (Category A)((XDA13040401));Key Project of Chinese Academy of Engineering (2017-XZ-16)(2017-XZ-16)

Corresponding Authors: Baorong HOU E-mail: baoronghou@163.com

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Cite this article:

Tong LIAO,Zheng MA,Leilei LI,Xiumin MA,Xiutong WANG,Baorong HOU. Light-generated Cathodic Protection Properties of Fe₂O₃/TiO₂ Nanocomposites for 304 Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2019, 39(1): 36-42.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.210 OR https://www.jcscp.org/EN/Y2019/V39/I1/36

Fig.1 Schematic illustration of the experimental setup for photoelectrochemical test

Fig.2 SEM images of pure TiO₂ (a)，Fe₂O₃/TiO₂ (A) (b)，Fe₂O₃/TiO₂ (B) (c)，Fe₂O₃/TiO₂ (C) (d)，Fe₂O₃/TiO₂ (D) (e) and Fe₂O₃/TiO₂ (E) (f)， and EDS result of Fe₂O₃/TiO₂ (C) (g)

Fig.3 XRD patterns of Fe₂O₃/TiO₂ nanocomposites

Fig.4 Full XPS (a) of Fe₂O₃/TiO₂ (C) and fine XPS of Ti 2p (b), O 1s (c) and Fe 2p (d)

Fig.5 UV-vis diffuse reflection spectra of pure TiO₂ and Fe₂O₃/TiO₂ nanocomposites

Fig.6 OCP variations of 304SS coupled with different photoanodes under intermittent illumination

Fig.7 Photocurrent density-time curves of different photoanodes

Fig.8 EIS plots of Fe₂O₃/TiO₂ photoanodes (a), EIS of high frequency region (b) and equivalent circuit used for fitting EIS (c)

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