A study on wear and corrosion behaviour of thermally sprayed alumina-titania composite coatings on aluminium alloys

MİNDİVAN H.

Kovove Materialy, vol.48, no.3, pp.203-210, 2010 (SCI-Expanded, Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 48 Issue: 3
  • Publication Date: 2010
  • Doi Number: 10.4149/km-2010-3-203
  • Journal Name: Kovove Materialy
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.203-210
  • Keywords: Aluminium, Coating, Corrosion, Thermal spray, Wear
  • Bilecik Şeyh Edebali University Affiliated: No

Abstract

In this study, Al2O3-13TiO2 + 10 % polytetrafluoroethylene (PTFE) powders were sprayed using both flame and plasma spray processes after a NiAl bond layer was deposited on 2024-T6 aluminium alloy substrate. The characterization of the coatings was made by microscopic examinations, thickness, surface roughness, porosity and hardness measurements and X-ray diffraction (XRD) analysis. Corrosion and wear performances of the samples were analysed by using a potentiodynamic polarization scanning (PDS) technique and a reciprocating wear tester, respectively. It was found that the flame and plasma sprayed Al2O3-13TiO2 + 10 % PTFE coatings possessed about two and four times higher wear resistance than AA2024-T6 substrate, respectively. When compared to the flame sprayed Al 2O3-13TiO2 + 10 % PTFE coating, the plasma sprayed Al2O3-13TiO2 + 10 % PTFE coating with a lower porosity showed higher hardness and better wear and corrosion resistance.