Effects of Sn additions on microstructure and corrosion resistance of heat-treated Ti-Cu-Sn titanium alloys

摘要

The microstructure and corrosion properties of Ti7CuxSn (x=0-5wt-%) alloys after solution treatment have been investigated. The alloys were solution-treated (ST) at 1000 degrees C for 2h, followed by quenching in water to room temperature. It was found that the microstructure of the ST Ti7Cu alloy had only a martensite structure, and that addition of Sn could refine the microstructure of Ti7CuxSn alloy. Notably, the pseudo dendritic -Ti phase was formed in ST Ti7Cu5Sn alloys. Potentiodynamic polarisation curves and electrochemical impedance spectroscopy data demonstrated that adding Sn improved the electrochemical corrosion behaviour of the Ti7CuxSn alloy.