Loading...

Enhanced corrosion resistance of porous NiTi with plasma sprayed alumina coating

Hosseini, S. A ; Sharif University of Technology | 2015

840 Viewed
  1. Type of Document: Article
  2. DOI: 10.1179/1743278215Y.0000000024
  3. Publisher: Maney Publishing , 2015
  4. Abstract:
  5. In this study, corrosion behaviour of porous NiTi modified by plasma sprayed alumina coating has been investigated. Scanning electron microscopy and X-ray diffraction techniques were applied for the morphology and microstructure characterisation, while linear sweep voltammetry and electrochemical impedance spectroscopy were used for investigation of corrosion behaviour of coated and uncoated NiTi specimens. Induced couple plasma was conducted to measure ion release of the specimens in simulated body fluid at 37°C. The plasma sprayed Al2O3 coating on the porous NiTi improved the surface characteristics for biomedical applications. The alumina coating significantly hampered Ni ion release from the surface. In spite of slight decrease in corrosion resistance of the coated specimens, the corrosion mechanism changed from pitting to general corrosion. The breakdown phenomenon was not detected in the coated specimens, as well. Overall, it can be concluded the longevity of the coated specimen in the simulated biological system was enhanced, comparing to bare NiTi specimens
  6. Keywords:
  7. Plasma sprayed Al2O3 coating ; Porous NiTi ; Alumina ; Aluminum ; Aluminum coatings ; Coatings ; Corrosion ; Corrosion resistance ; Corrosive effects ; Electrochemical impedance spectroscopy ; Medical applications ; Nickel ; Plasma jets ; Scanning electron microscopy ; X ray diffraction ; Biomedical applications ; Corrosion behaviour ; Linear sweep voltammetry ; Microstructure characterisation ; Nickel release ; Plasma sprayed ; X-ray diffraction techniques ; Plasma spraying
  8. Source: Corrosion Engineering Science and Technology ; Volume 50, Issue 8 , 2015 , Pages 595-600 ; 1478422X (ISSN)
  9. URL: http://www.tandfonline.com/doi/full/10.1179/1743278215Y.0000000024