Structure and Resistance to Electrochemical Corrosion of NiTi Alloy

Bożena Łosiewicz; Magdalena Popczyk; Tomasz Goryczka; Józef Lelątko; Agnieszka Smołka; Piotr Kowalski

doi:10.4028/www.scientific.net/SSP.203-204.335

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HomeSolid State PhenomenaSolid State Phenomena Vols. 203-204Structure and Resistance to Electrochemical...

Structure and Resistance to Electrochemical Corrosion of NiTi Alloy

Abstract:

The NiTi alloy (50.6 at.% Ni) passivated for 30 min at 130°C by autoclaving has been studied towards corrosion resistance in aqueous solutions of 3% NaCl, 0.1 M H₂SO₄, 1 M H₂SO₄ and HBSS. Structure and thickness of the passive layer (TiO2, rutile) were examined by X-ray reflectivity method and high resolution electron microscopy. Corrosion behavior of this oxide layer was investigated by open circuit potential method and polarization curves. It was found that the corrosion resistance of the passivated NiTi alloy is strongly dependent on the type of corrosive environment. The higher corrosion resistance of the tested samples was revealed in sulfate solutions as compared to chloride ones. The highest resistance to electrochemical corrosion of the NiTi alloy was observed in 0.1 M H2SO4 solution. Susceptibility to pitting corrosion of the tested samples was observed which increased with the concentration rise of chlorine anions in solution. Electrochemical tests for 316L stainless steel carried out under the same experimental conditions revealed a weaker corrosion resistance in all solutions as compared to the highly corrosion resistant NiTi alloy.

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Periodical:

Solid State Phenomena (Volumes 203-204)

Pages:

335-338

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.203-204.335

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Online since:

June 2013

Authors:

Bożena Łosiewicz, Magdalena Popczyk, Tomasz Goryczka, Józef Lelątko, Agnieszka Smołka, Piotr Kowalski

Keywords:

Autoclaving, Corrosion Resistance, NiTi Alloy, Oxide Layer, Passivation, Structure

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