Susceptibility to stress corrosion cracking of NiTi laser weldment in Hanks' solution

C. W. Chan, Hau Chung Man, Tai Man Yue

Research output: Journal article publicationJournal articleAcademic researchpeer-review

21 Citations (Scopus)

Abstract

In this study, the susceptibility to stress corrosion cracking (SCC) of laser-welded NiTi wires in Hanks' solution at 37.5 °C was studied by the slow strain-rate test (SSRT) at open-circuit potential and at different applied anodic potentials. The weldment shows high susceptibility to SCC when the applied potential is near to the pitting potential of the heat-affected zone (HAZ). The pits formed in the HAZ become sites of crack initiation when stress is applied, and cracks propagate in an intergranular mode under the combined effect of corrosion and stress. In contrast, the base-metal is immune to SCC under similar conditions. The increase in susceptibility to SCC in the weldment could be attributed to the poor corrosion resistance in the coarse-grained HAZ.
Original languageEnglish
Pages (from-to)260-269
Number of pages10
JournalCorrosion Science
Volume57
DOIs
Publication statusPublished - 1 Apr 2012

Keywords

  • A. Intermetallics
  • B. Polarization
  • C. Intergranular corrosion
  • C. Stress corrosion
  • C. Welding

ASJC Scopus subject areas

  • Materials Science(all)
  • Chemical Engineering(all)
  • Chemistry(all)

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