Tribocorrosion Response of Laser Clad TiNiZrO₂ Composite Coatings on Ti6Al4V

Abstract:

The design of tribocorrosion resistant composite on Ti6Al4V alloy by laser surface cladding of admixed metal-ceramic powder was successfully achieved using a 2 kW CW ytterbium laser system (YLS). The effects of TiNiZrO₂ addition on the tribocorrosion properties of the synthesized composite coatings were investigated in 1 M H₂SO₄ solution using open circuit potential and potentiodynamic polarization techniques. The experimental results showed that TiNiZrO₂ refined the microstructure to flower-like structure. A strong metallurgical bond was obtained between the coatings and the Ti6Al4V alloy substrate with inter-columnar widmansttaten α΄ grains at the interface. There was a significant increase in surface microindentation hardness values of the clad layers. Also, the presence of zirconia shifted the tribocorrosion potential to more noble values and significantly enhanced the tribocorrosion resistance of the composites.

• Periodical: Materials Science Forum (Volumes 828-829)
• Pages: 345-350
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.828-829.345
• Online since: August 2015
• Authors: Babatunde A. Obadele*, Anthony Andrews, Peter Apata Olubambi, Mathew Thoppil Mathew, Sisa Pityana
• Keywords: Laser Cladding, Ti6Al4V, Tribocorrosion, Zro₂

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