A Comparative Study on the Corrosion Performance of Ni47Ti49Co4 and Ni51Ti49 Shape Memory Alloys in Simulated Saliva Solution for Dental Applications

In this study, the corrosion behavior of Ni47Ti49Co4 shape memory alloy（SMA） was investigated in simulated saliva solution with the binary alloy Ni（51）Ti49 as a reference. The surface morphology and the chemical composition of the oxide films were characterized by scanning electron microscopy and X-...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2016-11, Vol.29 (11), p.1001-1010
Main Author: Ahmed, Rasha A.
Format: Article
Language:English
Subjects:
Alloying
Alloys
Binary alloys
Biocompatibility
Characterization and Evaluation of Materials
Chemical composition
Chemistry and Materials Science
Cobalt
Comparative studies
Corrosion and Coatings
Corrosion currents
Corrosion potential
Corrosion resistance
Corrosion tests
Dental materials
Electrochemical impedance spectroscopy
Electrolytes
Materials Science
Mechanical properties
Metallic Materials
Morphology
Nanotechnology
Nickel titanides
Nitinol alloys
Organometallic Chemistry
Oxidation
Oxide coatings
Phase transitions
Photoelectrons
Physiology
Saliva
Scanning electron microscopy
Shape memory alloys
Spectroscopy/Spectrometry
Ternary alloys
Titanium
Tribology
X ray photoelectron spectroscopy
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Summary:In this study, the corrosion behavior of Ni47Ti49Co4 shape memory alloy（SMA） was investigated in simulated saliva solution with the binary alloy Ni（51）Ti49 as a reference. The surface morphology and the chemical composition of the oxide films were characterized by scanning electron microscopy and X-ray photoelectron spectroscopy before and after immersion in the test solutions, respectively. The results showed that the ternary alloy was less affected by the test solution,owning to the formation of passive layer composed mainly of the oxides of titanium and cobalt in several oxidation states.Cyclic voltammetry, electrochemical impedance spectroscopy and potentiodynamic polarization measurements affirmed that the passive oxide film significantly improved the corrosion resistance of Ni47Ti49Co4 SMAs as demonstrated by the smaller corrosion current density, larger resistance and smaller capacitance. Consequently, alloying with cobalt, which has paramount importance in enhancing the passive layer, expands the use of Ni47Ti49Co4 SMAs in dental work as new nitinol alloys with high corrosion resistances.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-016-0463-5