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51316-7270-Electrochemical Corrosion Behavior of Niobium Alloys as Metallic Bio-Implants

Picture for Electrochemical Corrosion Behavior of Niobium Alloys as Metallic Bio-Implants
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Mechanical properties and microstructure of Nb-Ta-Re, Nb-Re, Nb-Pd, and Nb-Pt alloys were studied by nano-indentation measurements and X-ray diffraction. Corrosion behavior was compared by electrochemical methods, including open circuit potential measurement, potentiodynamic, and electrochemical impedance spectroscopy.

Product Number: 51316-7270-SG
ISBN: 7270 2016 CP
Author: Wei Wang
Publication Date: 2016
Industry: Materials Selection and Design
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Alloying is one of the most important methods to improve the corrosion resistance and mechanical properties of metals. Previous studies show that the corrosion resistance of niobium Nb could be increased by Ta alloying in alkali solutions. Nevertheless, compared with Ti alloys, only a few Nb alloys were reported to increase their corrosion resistance. In this work, the mechanical properties and microstructure of Nb-Ta-Re, Nb-Re, Nb-Pd, and Nb-Pt alloys were studied by nano-indentation measurements and X-ray diffraction, respectively. The corrosion behavior of these alloys was compared by electrochemical methods, including open circuit potential measurement, potentiodynamic, and electrochemical impedance spectroscopy, in phosphate buffered saline (PBS) and sodium fluoride solutions. The properties of the passive films formed on these alloys were characterized by X-ray photoelectron spectroscopy. The results showed that Ta or Re alloying could increase the hardness and elastic modulus of Nb, however, these alloying elements did not significantly modify the phase structure of Nb. All of these Nb alloys show high corrosion resistance in PBS and NaF-containing PBS solutions, and no pitting behavior was observed. Re and Ta alloying could further increase the corrosion resistance of Nb, however, small amounts of Pd and Pt alloying did not significantly affect the corrosion resistance of Nb.

 Key words: downloadable, Niobium, corrosion, EIS, XPS

Alloying is one of the most important methods to improve the corrosion resistance and mechanical properties of metals. Previous studies show that the corrosion resistance of niobium Nb could be increased by Ta alloying in alkali solutions. Nevertheless, compared with Ti alloys, only a few Nb alloys were reported to increase their corrosion resistance. In this work, the mechanical properties and microstructure of Nb-Ta-Re, Nb-Re, Nb-Pd, and Nb-Pt alloys were studied by nano-indentation measurements and X-ray diffraction, respectively. The corrosion behavior of these alloys was compared by electrochemical methods, including open circuit potential measurement, potentiodynamic, and electrochemical impedance spectroscopy, in phosphate buffered saline (PBS) and sodium fluoride solutions. The properties of the passive films formed on these alloys were characterized by X-ray photoelectron spectroscopy. The results showed that Ta or Re alloying could increase the hardness and elastic modulus of Nb, however, these alloying elements did not significantly modify the phase structure of Nb. All of these Nb alloys show high corrosion resistance in PBS and NaF-containing PBS solutions, and no pitting behavior was observed. Re and Ta alloying could further increase the corrosion resistance of Nb, however, small amounts of Pd and Pt alloying did not significantly affect the corrosion resistance of Nb.

 Key words: downloadable, Niobium, corrosion, EIS, XPS

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ISBN: 7267 2016 CP
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ISBN: 7272 2016 CP
Author: Wei Wang
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51316-7265-Corrosion Behavior of Cr and Cu Containing Low Alloys Steels in Solution

Product Number: 51316-7265-SG
ISBN: 7265 2016 CP
Author: Qiu Xu
Publication Date: 2016
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Four low carbon steels with different Cr and Cu concentrations were prepared to investigate the effect of alloying elements on their corrosion behavior in 3.5% NaCl solution diluted hydrochloric acid and dilute sulphuric acid (pH=1.4-1.5) respectively. Electrochemical measurement and immersion test at room temperature characterized the corrosion behavior and evaluated the corrosion rate.
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