Microstructure and electrochemical behavior of laser cladded HA coating on pure titanium TA2

Abstract

Hydroxyapatite (HA, Ca₁₀(PO₄)₆(OH)₂) coating was fabricated on pure Ti (TA2) by laser cladding technology. The phase structure, microstructure, microhardness and electrochemical behavior of the laser cladded HA coating in artificial body fluid were investigated. The results show that the HA coating is mainly composed of highly crystallized HA. A transitional layer between HA coating and Ti substrate is formed. Microhardness measurement shows the gradually increasing of microhardness from 150 HV at TA2 substrate to 600 HV at transitional layer, and followed by a decreasing to 400 HV at HA coated layer. Electrochemical corrosion tests show that the HA coating has higher open circuit potential, lower corrosion current density and corrosion rate in comparison to the TA2 substrate.

Keywords

HA coating / laser cladding / electrochemical behavior / Hanks’ solution

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