Investigating the Effect of Changing Plasma Electrolytic Oxidation on the Scratch Degradation of Ti-6Al-4V
Subject Areas : Journal of Environmental Friendly Materials
M.R. Tavighi
1
,
A. Rabieifar
2
,
O. Ashkani
3
,
A. Asaadi Zahraei
4
1 - Advanced Materials Engineering Research Center, Karaj Branch, Islamic Azad University, Karaj, Iran.
2 - Advanced Materials Engineering Research Center, Karaj Branch, Islamic Azad University, Karaj, Iran.
3 - Faculty of Technology and Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
4 - Faculty of Materials Science and Engineering Khajeh Nasir Toosi University, Tehran. Iran
Keywords: Plasma Electrolytic Oxidation (PEO), Ti6Al4V Alloy, Scratch Test, Degradation Mechanisms,
Abstract :
In this research, plasma electrolytic oxidation (PEO) was prepared at duty voltage of 350 and 450 V and processing time of 5 and 10 minutes on Ti-6Al-4V alloy in Na2SiO3 + KOH electrolyte. Then, the adhesion strength and microstructural degradation of the coating surface were investigated through a constant load scratch test, field-emission scanning electron microscope (FE-SEM), and X-ray diffraction (XRD), respectively. The results showed that while increasing the processing time and duty voltage, the density of porosity and the amount of rutile on the coating surface increased. Meanwhile, microstructure degradations like delamination, gross spallation, and buckling spallation decreased due to increased adhesion strength. This resulted from an increase in voltage and processing time.
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