Improving exposure of anodically ordered Ni-Ti-O and corrosion resistance and biological properties of NiTi alloys by substrate electropolishing  

作　　者：Yong-Hua Sun Ya Zhao Yu-Yu Zhao You-Jie Rong Run-Hua Yao Xiao-Hong Yao Rui-Qiang Hang Paul K.Chu 

机构地区：[1]Laboratory of Biomaterial Surfaces and Interfaces,Institute of New Carbon Materials,Taiyuan University of Technology,Taiyuan 030024,China [2]Department of Physics,Department of Materials Science and Engineering,Department of Biomedical Engineering,City University of Hong Kong,Kowloon 999077,Hong Kong,China

出　　处：《Rare Metals》2021年第12期3575-3587,共13页稀有金属（英文版）

基　　金：financially supported by the Fund for Shanxi ‘‘1331 Project’’ Key Innovative Research Team (No.PY201809);the Program for the Innovative Talents of Higher Education Institutions of Shanxi (PTIT);the Natural Science Foundation of Shanxi Province (No. 201801D121093);Hong Kong Research Grant Council (RGC) General Research Funds (GRF)(No. City U11205617)。

摘　　要：Although Ni-Ti-O nanopores(NPs) can be fabricated by anodization of mechanically polished NiTi alloys, the top disordered layer is difficult to remove thus hindering the functionality of the Ni-Ti-O NPs. In this work, an electropolishing(EP) pretreatment was performed on the NiTi substrate prior to anodization to thoroughly expose the NPs. Our results show that the EP pretreatment for 5 min perfectly removes the top disordered layer on the Ni-Ti-O NPs to expose the underlying NPs and consequently, the corrosion resistance and antibacterial ability are enhanced. The exposed NPs can elongate bone marrow mesenchymal stem cells, which may be responsible for the upregulated alkaline phosphatase activity, secretion of Type I collagen, and extracellular matrix mineralization. These results suggest that EP is a desirable pretreatment before anodization of the NiTi alloys because the irregular surface layer on the Ni-Ti-O NPs can be removed to enhance the corrosion resistance and biological functions.

关 键 词：Nickel-titanium alloy Anodization Corrosion behavior Osteogenic activity Antibacterial ability 

分 类 号：TG174.4[金属学及工艺—金属表面处理]