ISSN (print) 0914-4935
ISSN (online) 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Effect of Electrolytic Polishing on Corrosion-fatigue Strength of TiNi Shape Memory Alloy

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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