Effect of Voltage on Morphology and Corrosion Behaviour of MAO Ceramic Coatings on Titanium Matrix Composite

Wanwan Cao

doi:10.6919/ICJE.202504_11(4).0018

Authors

Wanwan Cao

DOI:

https://doi.org/10.6919/ICJE.202504_11(4).0018

Keywords:

Titanium Matrix Composite; Micro-arc Oxidation; Oxidation Voltage; Corrosion Resistance.

Abstract

Titanium matrix composites have excellent properties and have received a lot of attention in the automotive and aerospace sectors. In this paper, micro-arc oxidised (MAO) TiO₂ films were prepared from titanium matrix composite using an electrolyte with sodium silicate as the main salt. The effects of different applied voltages on the surface morphology, microstructure, phase composition and corrosion resistance of the ceramic coatings were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD) and electrochemical workstations. The results show that after MAO treatment, the coating exhibits a microporous structure, which is mainly composed of Ti phase, anatase and rutile TiO₂ phases. All coating surfaces showed good performance without obvious cracks, and as the voltage increased, the micropores on the coatings became larger and the rutile TiO₂ phase in the coatings increased. The MAO coatings formed at 400 V were the thickest, had a denser surface morphology, the lowest corrosion current density, and the highest corrosion resistance. In summary, the best overall performance of the prepared membrane layer was achieved when the MAO voltage was 400 V.

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