title: Surface characteristics and electrochemical corrosion behavior of NiTi alloy coated with IrO2.
abstract: The aim of this work is to investigate the surface characteristics and corrosion behavior of NiTi (50.6 at.% Ni) shape memory alloy coated by a ceramic-like and highly biocompatible material, iridium oxide (IrO2). IrO2 coatings were prepared by thermal decomposition of H2IrCl6 · 6H2O precursor solution at the temperature of 300 °C, 400 °C and 500 °C, respectively. The surface morphology and microstructure of the coatings were investigated by scanning electron microscope (SEM) and glancing angle X-ray diffraction (GAXRD). X-ray photoelectron spectroscopy (XPS) was employed to determine the surface elemental composition. Corrosion resistance property of the coated samples was studied in a simulated body fluid at 37±1 °C by electrochemical method. It was found that the morphology and microstructure of the coatings were closely related to the oxidizing temperatures. A relatively smooth, intact and amorphous coating was obtained when the H2IrCl6·6H2O precursor solution (0.03 mol/L) was thermally decomposed at 300 °C for 0.5 h. Compared with the bare NiTi alloy, IrO2 coated samples exhibited better corrosion resistance behavior to some extent.
authors.affiliation: Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China.
authors.forename: M
authors.initials: M
authors.lastname: Li
authors.affiliation: Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China.
authors.forename: Y B
authors.initials: YB
authors.lastname: Wang
authors.affiliation: Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China.
authors.forename: X
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China.
authors.forename: Q H
authors.initials: QH
authors.lastname: Li
authors.affiliation: Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China.
authors.forename: Q
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China; Biomedical engineering research center, Shenzhen institution of Peking University, Shenzhen 518057, China. Electronic address: chengyan@pku.edu.cn.
authors.forename: Y
authors.initials: Y
authors.lastname: Cheng
authors.affiliation: Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China; Biomedical engineering research center, Shenzhen institution of Peking University, Shenzhen 518057, China; Department of Advanced Materials and Nanotechnology, College of Engineering, Peking University, Beijing 100871, China.
authors.forename: Y F
authors.initials: YF
authors.lastname: Zheng
authors.affiliation: Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China; Biomedical engineering research center, Shenzhen institution of Peking University, Shenzhen 518057, China.
authors.forename: T F
authors.initials: TF
authors.lastname: Xi
authors.affiliation: Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China; Biomedical engineering research center, Shenzhen institution of Peking University, Shenzhen 518057, China; Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Peking University, Beijing 100871, China.
authors.forename: S C
authors.initials: SC
authors.lastname: Wei
mesh_terms: D000818:Animals; D016923:Cell Death / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D020099:Coated Materials, Biocompatible / Q000737:chemistry* / Q000494:pharmacology; D003343:Corrosion; D004560:Electricity; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects; D007495:Iridium / Q000737:chemistry*; D051379:Mice; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry* / Q000494:pharmacology; D010084:Oxidation-Reduction / Q000187:drug effects; D056951:Photoelectron Spectroscopy; D013499:Surface Properties; D013816:Thermodynamics; D013997:Time Factors; D014025:Titanium / Q000737:chemistry* / Q000494:pharmacology; D014961:X-Ray Diffraction
chemical_list: D020099:Coated Materials, Biocompatible; C044458:iridium oxide; C040654:titanium nickelide; D007495:Iridium; D009532:Nickel; D014025:Titanium