Sol-Gel Derived Ti-Fe Oxide Coating for Photoelectrochemical Cathodic Protection of Carbon Steel
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- Huang Jianshun
- Department of Metallurgy, School of Engineering, The University of Tokyo Shanghai Institute of Metallurgy, Chinese Academy of Science
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- Konishi Tomoyoshi
- Department of Metallurgy, School of Engineering, The University of Tokyo
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- Shinohara Tadashi
- Department of Metallurgy, School of Engineering, The University of Tokyo
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- Tsujikawa Shigeo
- Department of Metallurgy, School of Engineering, The University of Tokyo
書誌事項
- タイトル別名
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- Sol-Gel Derived Ti-Fe Oxide Coating for
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On the novel approach of corrosion protection of carbon steel by TiO2 coating under illumination, photoeffect of TiO2/C-steel system is affected by the structural and electronic properties of the interfacial Ti-Fe oxide. In the present work, Ti-Fe oxide with a wide range of composition, from TiO2 to α-Fe2O3, was prepared by sol-gel method. By studying the characteristics of the Ti-Fe oxides and their influences on the photoeffect of TiO2/C-steel system, a multi-layer coating, expressed as from outer coating layer to substrate: TiO2 (amorphous)/TiO2 (anatase)/Ti-Fe oxide/α-Fe2O3/C-steel, was proposed for more effective photoelectrochemical cathodic protection of carbon steel. TiO2 (anatase) layer without Fe contamination exhibits a good photoeffect and behaves like the source of photo-excited electrons. The inner α-Fe2O3 layer acts as both a barrier to retard the diffusion of Fe into TiO2 and a way for the transfer of photo-excited electrons from the TiO2 (anatase) coating to the substrate. The outer layer of amorphous TiO2 inhibits the oxygen reduction and reduces the photopotential to a more less noble value. The intermediate layer of amorphous Ti-Fe oxide provides deep levels for Fe2+/Fe3+ redox couple, for which Fe3+ is reduced to Fe2+ by the photo-excited electrons under illumination. The state of Fe2+ left after stopping illumination contributes to phenomenon that the electrode potential is maintained at considerably less noble value until all the Fe2+ is re-oxidized by oxygen reduction.
収録刊行物
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- Zairyo‐to‐Kankyo
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Zairyo‐to‐Kankyo 47 (3), 193-199, 1998
公益社団法人 腐食防食学会
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詳細情報
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- CRID
- 1390001206260043776
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- NII論文ID
- 130004238577
- 10002174327
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- NII書誌ID
- AN10235427
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- COI
- 1:CAS:528:DyaK1cXhvFanu7g%3D
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- ISSN
- 18819664
- 09170480
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- NDL書誌ID
- 4424577
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可