Effect of plasma electrolytic oxidation time on the corrosion behavior of Ti-13Nb-13Zr alloy in Ringer's solution

Subject Areas :

Mahmoud Hajisafari ¹ , Arman Zarebidaki ² , amir daneshpazhouh ³

1 - Department of Metallurgy and Materials Engineering, Islamic Azad University, Yazd Branch, Yazd, Iran
2 - Department of Metallurgy and Materials Engineering, Islamic Azad University, Yazd Branch, Yazd, Iran
3 - Department of Metallurgy and Materials Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran

Received: 2017-09-24 Accepted : 2017-10-09 Published : 2017-08-23

Keywords: Iran, Islamic Azad University, Yazd, Department of Metallurgy and Materials Engineering, Yazd Branch,

Abstract :

Among different types of Ti alloys, Ti-6Al-4V alloy has been most used in biological applications. Because of the toxicity of Al and V elements there is trend for replacing them with Ti-13Nb-13Zr alloy as a new generation of titanium alloy. In the current study plasma electrolytic oxidation (PEO) process was used to create an oxide film on Ti-13Nb-13Zr alloy at different processing time of 1, 4, 7 and 10 minutes in a bath containing Ca and P ions at 250V. Microstructure of the specimens was studied by Field Emission Scanning Electron Microscope (FESEM). Rresults showed that the oxide film formed by PEO process contains Ti6O, Nb6O and CaHPO4 phases and increasing the time of process have no effect on the thickness of the coating. Dynamic Polarization test and time dependency of the open circuit potential was used for evaluating the corrosion behavior of the specimens in deaerated Ringer's solution. Results showed that the specimen treated for 1 minute has the lower icor and the higher Ecor (2.5×10-7 A/Cm2 and -0.12 V vs. Ag/AgCl respectively).

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