Surface Characterization of NiTi Superelastic and Shape Memory Alloys After Electrolytic Polishing

被引：0

作者：

de Azevedo Lopes, Natalia Isabel ^{[1
]}

de Oliveira Silva, Lais Avila ^{[1
]}

Santos, Leandro de Arruda ^{[1
]}

Lopes Buono, Vicente Tadeu ^{[1
]}

机构：

[1] Univ Fed Minas Gerais, Dept Engn Met & Mat, Belo Horizonte, MG, Brazil

来源：

MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS | 2017年 / 20卷

关键词：

NiTi; superelasticity; shape memory effect; electrolytic polishing; biomaterial; CORROSION BEHAVIOR;

D O I：

10.1590/1980-5373-MR-2016-0933

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

For the biomedical application of NiTi alloys, an excellent surface finishing process is required to guarantee high corrosion resistance and biocompatibility, eliminating the allergenic and toxic effects associated with the release of nickel ions in the body. Electropolishing is a process that can reduce surface imperfections and form a thin protective layer of TiO2, even in complex-shaped devices. The main objective of our study was to find and report suitable parameters for electrolytic polishing of NiTi wires, in both the superelastic and shape memory states. The results indicate that electropolishing in a 3.5 mol.L-1 methanolic H2SO4 electrolyte at 20 degrees C can effectively reduce surface roughness, remove superficial nickel-rich layers and improve corrosion resistance for austenitic and martensitic NiTi alloys.

引用

页码：572 / 579

页数：8

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