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Vol. 32, No. 8(2), S&M2292

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Sensors and Materials, Volume 32, Number 8(3) (2020)
Copyright(C) MYU K.K.
pp. 2859-2866
S&M2306 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2020.2865
Published: August 31, 2020

Effect of Electrolytic Polishing on Corrosion Fatigue Strength of TiNi Shape Memory Alloy [PDF]

Ryosuke Matsui and Masato Okumura

(Received March 16, 2020; Accepted July 8, 2020)

Keywords: shape memory alloy, TiNi alloy, corrosion, corrosion fatigue, electrolytic polishing

The corrosion fatigue strength of a TiNi shape memory alloy (SMA) is crucial for ensuring safety when the material is used as a sensor or actuator element in a severely corrosive environment, such as sea water. Furthermore, in the medical field, the corrosion fatigue strength in a blood vessel is important because it determines the product life of medical devices, such as self-expanding stents. In this study, we improved the corrosion fatigue strength of a TiNi SMA wire by electrolytic polishing. The main findings are as follows: (1) Electrolytic polishing in 25 wt% nitric acid and 75 wt% methanol at 218 K after mechanical polishing significantly reduces the surface roughness of the TiNi SMA wire. (2) The electrolytically polished TiNi SMA wire has a thin passive layer of TiO2 on its surface. (3) The corrosion fatigue life of the electrolytically polished TiNi SMA wire is much longer than that of a conventional TiNi SMA wire. (4) The fatigue crack on the electrolytically polished TiNi SMA wire initiates at a surface micro-imperfection.

Corresponding author: Ryosuke Matsui


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Cite this article
Ryosuke Matsui and Masato Okumura, Effect of Electrolytic Polishing on Corrosion Fatigue Strength of TiNi Shape Memory Alloy, Sens. Mater., Vol. 32, No. 8, 2020, p. 2859-2866.



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