Effect of Polarization Scan Rate on the Pitting Potential of the Self-Passivated NiTi Shape Memory Alloy in a Simulated Body Fluid

Patrycja Osak; Tomasz Goryczka; Bożena Łosiewicz

doi:10.4028/www.scientific.net/SSP.227.443

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Effect of Polarization Scan Rate on the Pitting Potential of the Self-Passivated NiTi Shape Memory Alloy in a Simulated Body Fluid
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HomeSolid State PhenomenaSolid State Phenomena Vol. 227Effect of Polarization Scan Rate on the Pitting...

Effect of Polarization Scan Rate on the Pitting Potential of the Self-Passivated NiTi Shape Memory Alloy in a Simulated Body Fluid

Abstract:

The pitting potential, E_pit, of the passive layer on the implant alloy can be treated as an accelerated laboratory test to assessment a susceptibility to pitting corrosion of metallic biomaterials in simulated body fluids. This study deals with an evaluation of E_pit of the self-passivated TiO₂ layer formed on the surface of the NiTi implant alloy as a function of the scan rate of polarization. Cyclic potentiodynamic studies were performed in Ringer’s solution at 37°C. It was found out that the more noble value of E_pit in the range of 0.99-2 V was registered at a given polarization scan rate that ranged from 0.16 to 2 mV s^-1, the lower susceptibility of the self-passivated NiTi implant alloy to the initiation of pits was detected.

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Periodical:

Solid State Phenomena (Volume 227)

Pages:

443-446

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.227.443

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Online since:

January 2015

Authors:

Patrycja Osak*, Tomasz Goryczka, Bożena Łosiewicz

Keywords:

NiTi Alloy, Passivation, Pitting Potential, Polarization Scan Rate, Shape Memory Effect

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