Effect of post-weld heat-treatment on the oxide film and corrosion behaviour of laser-welded shape memory NiTi wires

C. W. Chan, H.C. Man, T.M. Yue

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

Post-weld heat-treatment (PWHT) was applied to NiTi weldments to improve the corrosion behaviour by modifying the microstructure and surface composition. The surface oxide film on the weldments is principally TiO2, together with some Ti, TiO, and Ti2O3. The surface Ti/Ni ratio of the weldments after PWHT is increased. The oxide film formed in Hanks’ solution is thicker on the weldments after PWHT. The pitting resistance of the weldments is increased by PWHT. The galvanic effect in the weldments is very small. The weldment with PWHT at 350 °C shows the best corrosion resistance among other heat-treated weldments in this study.
Original languageEnglish
Pages (from-to)158-167
Number of pages10
JournalCorrosion Science
Volume56
Early online date03 Dec 2011
DOIs
Publication statusPublished - Mar 2012

Keywords

  • Intermetallics
  • EIS
  • XPS
  • Pitting Corrosion
  • Passive films
  • Welding

ASJC Scopus subject areas

  • Metals and Alloys

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