Abstract
Micro-arc oxidation (MAO) coatings were prepared on Ti6Al4V alloys surface by using self-made micro-arc oxidation equipment. Its characterizations were systematically detected by Vickers hardness tester, scanning electron microscope (SEM), X-ray diffractometer (XRD) and X-ray fluorescence spectrometer (XFS). Corrosion behaviour of MAO coating and Ti6Al4V alloy in Hank's simulated body fluid were studied comparatively using electrochemical workstations and salt spray test chamber. The experimental results indicated that the MAO coating, with rough surface, high hardness and typical porous ceramic structure, is mainly consist of anatase and rutile TiO2 phase. Micro-arc oxidation treatment can significantly improve corrosion resistance of Ti6Al4 alloy, and the corrosion resistance of the coating is observably affected by the coating technology. During the micro-arc oxidation treatment, the thickness of the coating increases with the increase of oxidation time, which induce that the corrosion potential and polarization resistance of the coating increase, and the corrosion current reduce. Simultaneously, the thicker the coating, the higher the pitting resistance is. On the other hand, under the same oxidation time, as the current density increases during micro-arc oxidation treatment, the corrosion potential of the coating positive shifts, and the corrosion current reduces.
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