Abstract
Laser gas-assisted nitriding of Ti-6Al-4V alloy has been considered and the electrochemical response of the nitrided surfaces was examined. A CO2 laser delivering output power in 1500 Hz pulses was used to irradiate the alloy surface. XRD, EDS and SEM were used for microstructural analysis and surface morphology of the nitrided surfaces prior and after the electrochemical tests. To monitor the surface phenomena occurring during the nitriding process, a CCD camera was used. Potentiodynamic and petontiostatic polarization tests were carried out. It is found that δ-TiN and ε-Ti2N were the dominant phases in the surface region of the nitrided workpieces. The depth of nitride layer extends beyond 50 μm below the surface. No microcracks or voids were observed in the nitrided layer and the layer thickness extended homogeneously over the workpiece surface. Some scattered pit sites were observed at the nitrided surfaces, which may be attributed to the irregularly scattered surface texture peaks.
| Original language | English |
|---|---|
| Pages (from-to) | 679-685 |
| Number of pages | 7 |
| Journal | Surface and Coatings Technology |
| Volume | 201 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - 5 Oct 2006 |
Bibliographical note
Funding Information:The authors acknowledge the support of King Fahd University of Petroleum and Minerals Dhahran Saudi Arabia for providing analytical tools for material characterization, Gazi University for providing some SEM studies and Karmetal Ltd for providing nitriding processes.
Keywords
- Characterization
- Corrosion
- Laser
- Nitriding
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry