ABSTRACT The influence of microstructures of the two TC4 substrates on the growth process and properties of micro-arc oxidation (MAO) coatings were investigated and compared. The morphologies, thickness, roughness and… Click to show full abstract
ABSTRACT The influence of microstructures of the two TC4 substrates on the growth process and properties of micro-arc oxidation (MAO) coatings were investigated and compared. The morphologies, thickness, roughness and compositions of the coatings on forging-TC4 (F-MAO) and SLM-TC4 (S-MAO) were characterised by scanning electron microscopy, atomic force microscopy, energy-dispersive spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The SLM-TC4 exhibits needles of α′ phase, while forging-TC4 have distinct α and β phases. The results show that α′ phase of SLM-TC4 causes the discharge channels to be uniform during MAO process, making S-MAO free of cracks. The S-MAO coating has smaller pores and lower roughness, but thicker than that of F-MAO coating. S-MAO coating has better corrosion resistance and biological activity than that of F-MAO in SBF.
               
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