| SHI Tingyue,YANG Xiaohong,CHENG Xin,LIU Cong,LIU Jiapeng,GUO Zikuan,ZHANG Binchao,ZONG Qianying,XIAO Fengjuan.Recent Progress of Steel Structure Surface Photochemical Cathodic Protection Materials and Their Photoanodes[J],53(19):27-39 |
| Recent Progress of Steel Structure Surface Photochemical Cathodic Protection Materials and Their Photoanodes |
| Received:December 29, 2023 Revised:May 24, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.19.003 |
| KeyWord:photoelectric conversion efficiency photocathodic protection photoanode doping reconstruction heterojunction engineering anticorrosion coating |
| Author | Institution |
| SHI Tingyue |
School of Materials Science and Engineering,Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang , China |
| YANG Xiaohong |
School of Materials Science and Engineering,Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang , China |
| CHENG Xin |
School of Materials Science and Engineering,Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang , China |
| LIU Cong |
School of Materials Science and Engineering,Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang , China |
| LIU Jiapeng |
School of Materials Science and Engineering,Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang , China |
| GUO Zikuan |
School of Materials Science and Engineering,Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang , China |
| ZHANG Binchao |
School of Materials Science and Engineering,Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang , China |
| ZONG Qianying |
School of Materials Science and Engineering,Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang , China |
| XIAO Fengjuan |
School of Materials Science and Engineering,Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang , China |
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| Abstract: |
| The corrosion of steel structure equipment and buildings brings huge waste of resources, economic losses and safety hazards. Common electrochemical corrosion protection causes environmental pollution and waste of resources. The photoelectricity cathodic protection (PECP) is an energy saving, environmental protection anticorrosion technology which uses semiconductor light radiation to produce photoelectrons. The photogenerated electrons are driven by potential difference, transferred to the metal surface through an external circuit and enriched on the steel structure, so that the steel cathode is polarized, thus inhibiting the steel from corrosion. PECP is an economical and sustainable corrosion protection technology based on sunlight as energy and does not consume the material itself. In recent years, PECP technology has been widely studied and rapidly developed. However, the problems such as insufficient photoelectric conversion efficiency, poor stability of photoanode, and less involvement in the combination of organic coating have become prominent bottlenecks restricting the development of photocathodic protection materials. The latest strategies and methods for improving the properties of photocathodic protection materials at home and abroad in recent years were reviewed in this paper with emphasis on the role and development of improving the photoelectric conversion efficiency and stability of TiO2, ZnO, g-C3N4, BiVO4 and polymer-based nanomaterials through ion-doped structural reconstruction, sensitization and co-sensitization, heterojunction engineering as well as combination with polymer coating. The feasibility of photocathodic protection of stainless steel and carbon steel was demonstrated. The reconstruction of ion doping could distort the crystal structure and produce the active site and impurity level, and improve the photoelectric conversion efficiency. The doping reconstruction of alkali metal ions such as k and the co-doped reconstruction of Mo and Cr significantly improved the photoelectric conversion efficiency of TiO2 photoanode, and gave excellent dark state protection and PECP performance. Graphene quantum dots (GQDs) in quantum dots sensitization had strong visible light absorption and high charge storage efficiency, so they had high development value in the PECP photoanodes. The heterojunction engineering had obvious advantages in constructing stable photoanode and improving dark cathodic protection. The n-n type heterojunction, with obvious providing electron characteristics, had a special position in improving the efficiency of photocathodic protection. However, recent studies showed that p-n type heterojunction could speed up the carrier separation and transmission rate due to the formation of a more effective built-in electric field, and also significantly improved the photoelectric conversion efficiency of the TiO2 photoanode. Among them, the TiO2-WO3/rGO photoanode developed in China could provide durable dark protection for 304 stainless steel, laying a solid foundation for the practical application of PECP materials. The conductive polymer had charge/discharge function on the coating, and had good coating protection and cathodic protection function in light and dark state. The composites of PECP material and polymer coating had development value for the application of PECP material in the surface anticorrosion of steel structure. In the anti-corrosion coating formed by polyacrylic acid (PAA), TiO2-carboxyl methyl cellulose (CMC), the connection between TiO2 and PAA-CMC enhanced the electronic storage, which was conducive to the continuous protection of 304SS in light and dark states. The TIO2-PAA-CMC anti-corrosion coating had excellent PECP performance and long-term corrosion protection function in seawater. The existing problems, challenges and development trends in the research and application of stainless steel photocathodic protection were put forward in this paper, providing valuable theoretical and technical references for the practical application of semiconductor materials in photocathodic protection at home and abroad. |
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