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 language | English |
|---|---|
| Pages (from-to) | 158-167 |
| Number of pages | 10 |
| Journal | Corrosion Science |
| Volume | 56 |
| Early online date | 03 Dec 2011 |
| DOIs | |
| Publication status | Published - Mar 2012 |
Keywords
- Intermetallics
- EIS
- XPS
- Pitting Corrosion
- Passive films
- Welding
ASJC Scopus subject areas
- Metals and Alloys