PEO coating on Mg-Ag alloy:The incorporation and release of Ag species  

作　　者：Xinxin Zhang Yupeng Zhang You Lv Zehua Dong Lei Yang Erlin Zhang Teruo Hashimoto Xiaorong Zhou 

机构地区：[1]Key Laboratory of Material Chemistry for Energy Conversion and Storage,Ministry of Education,Hubei Key Laboratory of Material Chemistry and Service Failure,School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]Hubei Engineering Research Centre for Biomaterials and Medical Protective Materials,Huazhong University of Science and Technology,Wuhan 430074,China [3]Key Laboratory for Anisotropy and Texture of Materials,Education Ministry of China,School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [4]Corrosion and Protection Centre,Department of Materials,The University of Manchester,Manchester M139PL,United Kingdom

出　　处：《Journal of Magnesium and Alloys》2023年第6期2182-2195,共14页镁合金学报（英文）

基　　金：the financial support from the Hubei Provincial Natural Science Foundation of China(No.2020CFB295);the National Natural Science Foundation of China(No.52001128);the Innovative Foundation of Huazhong University of Science and Technology(No.2021JYCXJJ023);the Innovation and Talent Recruitment Base of New Energy Chemistry and Device(No.B21003)。

摘　　要：In the present study,the distribution of Ag in the coating formed on Mg-Ag alloy by plasma electrolytic oxidation(PEO)and its ionic release kinetics when exposed to a 0.9 wt.%Na Cl solution at 37℃have been investigated.Both metallic Ag and Ag oxide particles with~5 to~40 nm in diameters were observed in the PEO coating.Further,an Ag-enriched layer of~20 nm in thickness at the substrate/coating interface was also observed.The PEO coating on the Mg-Ag alloy not only increases its corrosion resistance with the corrosion current density decreasing by up to 3 orders of magnitude from 8.04×10^(-3)to 4.03×10^(-6)A/cm^(2),but also controls the release of Ag+to the level that is sufficient for anti-infective efficacy without causing cytotoxicity to mammal cells.

关 键 词：Mg-Ag alloy Plasma electrolytic oxidation Ag distribution Ag release Corrosion resistance 

分 类 号：TG174.4[金属学及工艺—金属表面处理]