Surface characteristics and electrochemical corrosion behavior of NiTi alloy coated with IrO2

M Li; Y B Wang; X Zhang; Q H Li; Q Liu; Y Cheng; Y F Zheng; T F Xi; S C Wei

doi:10.1016/j.msec.2012.07.026

Surface characteristics and electrochemical corrosion behavior of NiTi alloy coated with IrO2

Mater Sci Eng C Mater Biol Appl. 2013 Jan 1;33(1):15-20. doi: 10.1016/j.msec.2012.07.026. Epub 2012 Jul 22.

Authors

M Li¹, Y B Wang¹, X Zhang¹, Q H Li¹, Q Liu¹, Y Cheng², Y F Zheng³, T F Xi⁴, S C Wei⁵

Affiliations

¹ Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China.
² 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.
³ 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.
⁴ 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.
⁵ 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.

PMID: 25428036
DOI: 10.1016/j.msec.2012.07.026

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.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Animals
Cell Death / drug effects
Cell Survival / drug effects
Coated Materials, Biocompatible / chemistry*
Coated Materials, Biocompatible / pharmacology
Corrosion
Electricity
Electrochemical Techniques / methods*
Electrodes
Fibroblasts / cytology
Fibroblasts / drug effects
Iridium / chemistry*
Mice
Microscopy, Electron, Scanning
Nickel / chemistry*
Nickel / pharmacology
Oxidation-Reduction / drug effects
Photoelectron Spectroscopy
Surface Properties
Thermodynamics
Time Factors
Titanium / chemistry*
Titanium / pharmacology
X-Ray Diffraction

Substances

Coated Materials, Biocompatible
iridium oxide
titanium nickelide
Iridium
Nickel
Titanium