کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1429034 987163 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Surface characteristics and electrochemical corrosion behavior of NiTi alloy coated with IrO2
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
پیش نمایش صفحه اول مقاله
Surface characteristics and electrochemical corrosion behavior of NiTi alloy coated with IrO2
چکیده انگلیسی

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.


► First report on the surface coating of NiTi alloy by iridium oxide (IrO2).
► The coatings’ microstructure was closely related to the oxidizing temperatures.
► The corrosion resistance of NiTi alloy was improved by IrO2 coatings.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: C - Volume 33, Issue 1, 1 January 2013, Pages 15–20
نویسندگان
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