title: Surface corrosion enhancement of passive films on NiTi shape memory alloy in different solutions.
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.
authors.affiliation: 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.
authors.forename: Lv
authors.initials: L
authors.lastname: Jinlong
authors.affiliation: 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.
authors.forename: Liang
authors.initials: L
authors.lastname: Tongxiang
authors.affiliation: 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.
authors.forename: Wang
authors.initials: W
authors.lastname: Chen
authors.affiliation: 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.
authors.forename: Dong
authors.initials: D
authors.lastname: Limin
mesh_terms: D000497:Alloys / Q000737:chemistry*; D003343:Corrosion; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D012996:Solutions; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium
keywords: Corrosion resistance; Electrochemical properties; Passive film; Surface