Deposition and study of plasma sprayed Al2O3-TiO2 coatings on AZ31 magnesium alloy

Year 2023, , 35 - 40, 20.03.2023

Tuğba Bayram , Muhammet Karabaş , Yusuf Kayalı

https://doi.org/10.26701/ems.1175394

Abstract

In this study, Al2O3, TiO2 and Al2O3+ 3wt%TiO2 coatings were deposited on AZ31 Mg alloy substrate by plasma spraying. The coatings were structurally characterized by scanning electron microscopy and X-ray diffraction. Corrosion experiments were carried out in 3.5% NaCl solution. Adhesion tests were performed according to daimler benz VDI-3198 standard. A coating layer of approximately 70 microns in thickness was deposited. High plasma enthalpy caused phase transformations in alumina-based ceramics. As a result of electrochemical corrosion study, it was determined that the coatings increased the corrosion resistance of AZ31 Mg alloy. While the most corrosion resistant coating is Al2O3+ 3wt%TiO2, the weakest coating against corrosion is TiO2. The adhesion behavior of all coatings to the substrate was at an acceptable quality levels.

Keywords

Plasma spraying, Coating, Alumina, Titania, Corrosion

Supporting Institution

Scientific Research Projects Coordination Unit of Hakkari University

Project Number

FM20BAP6

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