Coupling a titanium dioxide based heterostructure photoanode with electroless-deposited nickel-phosphorus alloy coating on magnesium alloy for enhanced corrosion protection  

作　　者：Yue Liu Feng Peng Guang-Ling Yang Zhi-Hui Xie Wenxin Dai Yuejun Ouyang Liang Wu Chuan-Jian Zhong 

机构地区：[1]Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province,College of Chemistry and Chemical Engineering,China West Normal University,Nanchong 637002,China [2]Medical Research Center,Department of Orthopedics,Guangdong Provincial People’s Hospital,Guangdong Academy of Medical Sciences,Guangzhou 510080,China [3]State Key Laboratory of Photocatalysis on Energy and Environment,Fuzhou University,Fuzhou 350116,China [4]Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol(PVA)Fiber Material,Huaihua University,Huaihua 418000,China [5]College of Materials Science and Engineering/National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China [6]Department of Chemistry,State University of New York at Binghamton,Binghamton,NY,13902,United States

出　　处：《Journal of Materials Science & Technology》2022年第31期252-265,共14页材料科学技术（英文版）

基　　金：supported by the Science and Technology Department of Sichuan Province(No.2021ZYD0049);the Natural Science Foundation of Hunan Province(No.2021JJ30543);Open Project Program of the State Key Laboratory of Photocatalysis on Energy and Environment(No.SKLPEE-KF201811),Fuzhou University;Open Project of Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province(No.CSPC202004);the Funda-mental Research Funds of CWNU(No.CXTD2020-1).C.J.Zhong ac-knowledges the support from the National Science Foundation(No.CHE 2102482).Support from the high-level full-time talents pro-gram of Guangdong Provincial People’s Hospital(No.KY012021462)is also acknowledged.

摘　　要：The utilization of photoelectrochemical cathodic protection(PECCP)enables an indirect corrosion pro-tection of metals with low self-corrosion potential by introducing a metallic nickel interlayer.However,the ability to enhance the PECCP efficiency remains challenging because of the inherent property of the semiconductor.Herein,this ability is demonstrated by coupling a covalent organic framework(TpBD)dec-orated TiO 2 photoanode(TiO 2/TpBD)with nickel coating on magnesium alloy for an effective corrosion protection.The composite photoanode showed direct PECCP for the nickel interlayer and indirect corro-sion protection of the magnesium alloy.The composite structure of the nanotube array and the covalent organic framework for the photoanode were confirmed by field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).The en-hanced photoelectrochemical conversion capability and PECCP performance of the nickel-coated Mg alloy were evidenced by the results from electrochemical and photoelectrochemical measurements including Mott-Schottky curves,photoinduced potential variations,and electrochemical impedance spectroscopy(EIS).Lastly,a corrosion protection mechanism is proposed,where the enhanced PECCP efficiency is at-tributed to the formation of a direct Z-scheme heterojunction,which is substantiated by the results from valence band(VB)XPS and electron spin resonance characterizations.

关 键 词：Magnesium alloy Corrosion Nickel coating ELECTROLESS Photoelectrochemical cathodic protection 

分 类 号：TG174.4[金属学及工艺—金属表面处理]