Surface corrosion enhancement of passive films on NiTi shape memory alloy in different solutions

Lv Jinlong; Liang Tongxiang; Wang Chen; Dong Limin

doi:10.1016/j.msec.2016.02.066

Surface corrosion enhancement of passive films on NiTi shape memory alloy in different solutions

Mater Sci Eng C Mater Biol Appl. 2016 Jun:63:192-7. doi: 10.1016/j.msec.2016.02.066. Epub 2016 Feb 27.

Authors

Lv Jinlong¹, Liang Tongxiang², Wang Chen³, Dong Limin³

Affiliations

¹ Beijing Key Laboratory of Fine Ceramics, Institute of Nuclear and New Energy Technology, Tsinghua University, Zhongguancun Street, Haidian District, Beijing 100084, China; State Key Lab of New Ceramic and Fine Processing, Tsinghua University, Beijing 100084, China. Electronic address: ljltsinghua@126.com.
² Beijing Key Laboratory of Fine Ceramics, Institute of Nuclear and New Energy Technology, Tsinghua University, Zhongguancun Street, Haidian District, Beijing 100084, China; State Key Lab of New Ceramic and Fine Processing, Tsinghua University, Beijing 100084, China. Electronic address: txliang@mail.tsinghua.edu.cn.
³ Beijing Key Laboratory of Fine Ceramics, Institute of Nuclear and New Energy Technology, Tsinghua University, Zhongguancun Street, Haidian District, Beijing 100084, China; State Key Lab of New Ceramic and Fine Processing, Tsinghua University, Beijing 100084, China.

PMID: 27040211
DOI: 10.1016/j.msec.2016.02.066

Abstract

The corrosion behaviors of NiTi shape memory alloy in NaCl solution, H2SO4 solution and borate buffer solution were investigated. It was found that TiO2 in passive film improved the corrosion resistance of NiTi shape memory. However, low corrosion resistance of passive film was observed in low pH value acidic solution due to TiO2 dissolution. Moreover, the corrosion resistance of NiTi shape memory alloy decreased with the increasing of passivated potential in the three solutions. The donor density in passive film increased with the increasing of passivated potential. Different solutions affect the semiconductor characteristics of the passive film. The reducing in the corrosion resistance was attributed to the more donor concentrations in passive film and thinner thickness of the passive film.

Keywords: Corrosion resistance; Electrochemical properties; Passive film; Surface.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Alloys / chemistry*
Corrosion
Hydrogen-Ion Concentration
Microscopy, Electron, Scanning
Nickel / chemistry*
Solutions / chemistry*
Spectrometry, X-Ray Emission
Surface Properties
Titanium / chemistry*
X-Ray Diffraction

Substances

Alloys
Solutions
titanium nickelide
Nickel
Titanium