Surface structure and corrosion resistance of short-time heat-treated NiTi shape memory alloy

2010 ◽  
Vol 257 (5) ◽  
pp. 1573-1582 ◽  
Author(s):  
D. Vojtěch ◽  
M. Voděrová ◽  
J. Fojt ◽  
P. Novák ◽  
T. Kubásek
Keyword(s):  
Corrosion Resistance ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Surface Structure ◽  
Niti Shape Memory Alloy ◽  
Heat Treated ◽  
Short Time

Corrosion Kinetics of Laser Treated NiTi Shape Memory Alloy Biomaterials

1996 ◽  
Vol 459 ◽  
Author(s):  
F. Villermaux ◽  
I. Nakatsugawa ◽  
M. Tabrizian ◽  
D. L. Piron ◽  
M. Meunier ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Laser Treatment ◽  
Niti Alloy ◽  
Niti Shape Memory Alloy ◽  
Surgical Implants ◽  
Hank’S Solution ◽  
Kinetics Of ◽  
Human Fluids

ABSTRACTNiTi shape memory alloy presents interesting mechanical properties as surgical implants. However, due to its high amount of Ni which may dissolve and release toxic ions in human fluids, the medical use of this material is a great concern. We have developed a laser treatment which modifies the oxide layer and enhances uniform and localised corrosion resistance of NiTi alloy.In this paper we further analysed the effect of this treatment with potentiostatic and AC impedance measurements in physiological Hank's solution. We conclude that the laser treatment creates a stable passive film which results in improved corrosion resistance of this alloy.

Application of EIS to Study the Corrosion Resistance of Passivated NiTi Shape Memory Alloy in Simulated Body Fluid

2011 ◽  
Vol 183 ◽  
pp. 57-64 ◽  
Author(s):  
Marlena Freitag ◽  
B. Łosiewicz ◽  
Tomasz Goryczka ◽  
Józef Lelątko
Keyword(s):  
Corrosion Resistance ◽  
Shape Memory Alloy ◽  
Simulated Body Fluid ◽  
Shape Memory ◽  
Pitting Corrosion ◽  
Body Fluid ◽  
Niti Alloy ◽  
Amorphous State ◽  
Open Circuit ◽  
Niti Shape Memory Alloy

The NiTi shape memory alloy passivated for 90 min by autoclaving has been studied towards corrosion performance in the Tyrode’s simulated body fluid using open circuit potential and EIS measurements. The surface morphology and thickness of the oxide layer was determined by XRR. The HREM was used to observe the cross-section of the thin foil and to confirm the amorphous state of the TiO2 layer and its thickness. Electrochemical measurements revealed a good corrosion resistance at the beginning of long-term (20 days) immersion. It was found that with the increase of immersion time, the corrosion resistance of the surface deteriorated after nearly 1 day of immersion due to occurence of pitting corrosion. The EIS method was used to detailed study on the electrolyte | passive layer interfacial properties. Equivalent electrical circuit for the pitting corrosion on the passivated NiTi alloy has been applied.

Study of the microstructure evolution of heat treated Ti-rich NiTi shape memory alloy

2016 ◽  
Vol 112 ◽  
pp. 11-19 ◽  
Author(s):  
Ghazal Tadayyon ◽  
Mohammad Mazinani ◽  
Yina Guo ◽  
Seyed Mojtaba Zebarjad ◽  
Syed A.M. Tofail ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Microstructure Evolution ◽  
Niti Shape Memory Alloy ◽  
Heat Treated
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