Effect of thermal oxidation treatment on surface characteristic and corrosion resistance of Ni-Ti shape memory alloy

Hirokatsu Sugawara, Hirotake Goto, Jun Komotori

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In this study, a mechanically polished Ni-Ti alloy was subjected to isothermal oxidation (TO) in N2-20vol.%O2 at temperatures ranging from 300 to 800°C. TO-treated surfaces were then characterized by field emission type scanning electron microscopy (FE-SEM), energy dispersive X-ray spectrometer (EDX), X-ray electron spectroscopy (XPS) and X-ray diffraction (XRD). Electrochemical corrosion tests were also carried out using a three electrochemical cell connected to a computer driven potentiostat. Results showed that Ni-Ti alloy exhibited different oxidation behavior depending on the treatment temperatures. A Ni free layer was observed in the oxide layer for the specimens TO-treated at temperatures 500°C and above. Specimens TO-treated at temperatures ranging from 300 to 500°C showed higher corrosion resistance compared to that of the surface finished by polishing. This was because the TO-treatment created a thick oxide layer with an amorphous structure. Specimens TO-treated at above 600°C showed very low passive current densities, but lower pitting potential. This was because these samples were covered with crystalline oxide. Consequently, the TO-treatment at 500°C produced a smooth protective nickel free oxide layer, which contributes to good biocompatibility of Ni-Ti implants.

Original languageEnglish
Pages (from-to)965-970
Number of pages6
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume55
Issue number10
DOIs
Publication statusPublished - 2006 Oct

Fingerprint

shape memory alloys
Shape memory effect
corrosion resistance
Oxides
Corrosion resistance
Oxidation
oxidation
oxides
electrochemical corrosion
X ray spectrometers
Temperature
corrosion tests
Electrochemical corrosion
x rays
temperature
Electron spectroscopy
Electrochemical cells
pitting
electrochemical cells
biocompatibility

Keywords

  • Biomaterials
  • Corrosion
  • Ni-Ti alloy
  • Shape memory
  • Surface treatment
  • Thermal oxidation

ASJC Scopus subject areas

  • Metals and Alloys
  • Chemical Engineering (miscellaneous)
  • Polymers and Plastics

Cite this

Effect of thermal oxidation treatment on surface characteristic and corrosion resistance of Ni-Ti shape memory alloy. / Sugawara, Hirokatsu; Goto, Hirotake; Komotori, Jun.

In: Zairyo/Journal of the Society of Materials Science, Japan, Vol. 55, No. 10, 10.2006, p. 965-970.

Research output: Contribution to journalArticle

@article{55aa5fd1cda549df96a689a324b47d3a,
title = "Effect of thermal oxidation treatment on surface characteristic and corrosion resistance of Ni-Ti shape memory alloy",
abstract = "In this study, a mechanically polished Ni-Ti alloy was subjected to isothermal oxidation (TO) in N2-20vol.{\%}O2 at temperatures ranging from 300 to 800°C. TO-treated surfaces were then characterized by field emission type scanning electron microscopy (FE-SEM), energy dispersive X-ray spectrometer (EDX), X-ray electron spectroscopy (XPS) and X-ray diffraction (XRD). Electrochemical corrosion tests were also carried out using a three electrochemical cell connected to a computer driven potentiostat. Results showed that Ni-Ti alloy exhibited different oxidation behavior depending on the treatment temperatures. A Ni free layer was observed in the oxide layer for the specimens TO-treated at temperatures 500°C and above. Specimens TO-treated at temperatures ranging from 300 to 500°C showed higher corrosion resistance compared to that of the surface finished by polishing. This was because the TO-treatment created a thick oxide layer with an amorphous structure. Specimens TO-treated at above 600°C showed very low passive current densities, but lower pitting potential. This was because these samples were covered with crystalline oxide. Consequently, the TO-treatment at 500°C produced a smooth protective nickel free oxide layer, which contributes to good biocompatibility of Ni-Ti implants.",
keywords = "Biomaterials, Corrosion, Ni-Ti alloy, Shape memory, Surface treatment, Thermal oxidation",
author = "Hirokatsu Sugawara and Hirotake Goto and Jun Komotori",
year = "2006",
month = "10",
doi = "10.2472/jsms.55.965",
language = "English",
volume = "55",
pages = "965--970",
journal = "Zairyo/Journal of the Society of Materials Science, Japan",
issn = "0514-5163",
publisher = "Society of Materials Science Japan",
number = "10",

}

TY - JOUR

T1 - Effect of thermal oxidation treatment on surface characteristic and corrosion resistance of Ni-Ti shape memory alloy

AU - Sugawara, Hirokatsu

AU - Goto, Hirotake

AU - Komotori, Jun

PY - 2006/10

Y1 - 2006/10

N2 - In this study, a mechanically polished Ni-Ti alloy was subjected to isothermal oxidation (TO) in N2-20vol.%O2 at temperatures ranging from 300 to 800°C. TO-treated surfaces were then characterized by field emission type scanning electron microscopy (FE-SEM), energy dispersive X-ray spectrometer (EDX), X-ray electron spectroscopy (XPS) and X-ray diffraction (XRD). Electrochemical corrosion tests were also carried out using a three electrochemical cell connected to a computer driven potentiostat. Results showed that Ni-Ti alloy exhibited different oxidation behavior depending on the treatment temperatures. A Ni free layer was observed in the oxide layer for the specimens TO-treated at temperatures 500°C and above. Specimens TO-treated at temperatures ranging from 300 to 500°C showed higher corrosion resistance compared to that of the surface finished by polishing. This was because the TO-treatment created a thick oxide layer with an amorphous structure. Specimens TO-treated at above 600°C showed very low passive current densities, but lower pitting potential. This was because these samples were covered with crystalline oxide. Consequently, the TO-treatment at 500°C produced a smooth protective nickel free oxide layer, which contributes to good biocompatibility of Ni-Ti implants.

AB - In this study, a mechanically polished Ni-Ti alloy was subjected to isothermal oxidation (TO) in N2-20vol.%O2 at temperatures ranging from 300 to 800°C. TO-treated surfaces were then characterized by field emission type scanning electron microscopy (FE-SEM), energy dispersive X-ray spectrometer (EDX), X-ray electron spectroscopy (XPS) and X-ray diffraction (XRD). Electrochemical corrosion tests were also carried out using a three electrochemical cell connected to a computer driven potentiostat. Results showed that Ni-Ti alloy exhibited different oxidation behavior depending on the treatment temperatures. A Ni free layer was observed in the oxide layer for the specimens TO-treated at temperatures 500°C and above. Specimens TO-treated at temperatures ranging from 300 to 500°C showed higher corrosion resistance compared to that of the surface finished by polishing. This was because the TO-treatment created a thick oxide layer with an amorphous structure. Specimens TO-treated at above 600°C showed very low passive current densities, but lower pitting potential. This was because these samples were covered with crystalline oxide. Consequently, the TO-treatment at 500°C produced a smooth protective nickel free oxide layer, which contributes to good biocompatibility of Ni-Ti implants.

KW - Biomaterials

KW - Corrosion

KW - Ni-Ti alloy

KW - Shape memory

KW - Surface treatment

KW - Thermal oxidation

UR - http://www.scopus.com/inward/record.url?scp=33846063447&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33846063447&partnerID=8YFLogxK

U2 - 10.2472/jsms.55.965

DO - 10.2472/jsms.55.965

M3 - Article

AN - SCOPUS:33846063447

VL - 55

SP - 965

EP - 970

JO - Zairyo/Journal of the Society of Materials Science, Japan

JF - Zairyo/Journal of the Society of Materials Science, Japan

SN - 0514-5163

IS - 10

ER -