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

Year 2023, Volume: 7 Issue: 1, 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

References

• 1. Gray, J.E. and B. Luan, Protective coatings on magnesium and its alloys — a critical review. Journal of Alloys and Compounds, 2002. 336(1): p. 88-113. DOI: https://doi.org/10.1016/S0925-8388(01)01899-0.
• 2. Çelik, İ., Structure and surface properties of Al2O3–TiO2 ceramic coated AZ31 magnesium alloy. Ceramics International, 2016. 42(12): p. 13659-13663. DOI: https://doi.org/10.1016/j.ceramint.2016.05.162.
• 3. Jonda, E., L. Łatka, and W. Pakieła, Comparison of Different Cermet Coatings Sprayed on Magnesium Alloy by HVOF. 2021. 14(7): p. 1594. DOI: https://doi.org/10.3390/ma14071594.
• 4. Heimann, R.B., Plasma-Spray Coating: Principles and Applications. 2008: Wiley.
• 5. Gardon, M. and J.M. Guilemany, Milestones in Functional Titanium Dioxide Thermal Spray Coatings: A Review. Journal of Thermal Spray Technology, 2014. 23(4): p. 577-595. DOI: 10.1007/s11666-014-0066-5.
• 6. Toma, F.-L., C. Stahr, L.-M. Berger, S. Saaro, M. Herrmann, D. Deska, and G. Michael, Corrosion resistance of APS- and HVOF-sprayed coatings in the Al2O3-TiO2 system. Fraunhofer IWS, 2010. 19. DOI: 10.1007/s11666-009-9422-2.
• 7. Shankar, S., R. Nithyaprakash, G. Abbas, R. Naveenkumar, C. Prakash, A. Pramanik, and A.K.J.S. Basak, Tribological Behavior of AZ31 Alloy Against Si3N4 Using In-vitro and In-silico Submodeling Approach for Human Hip Prosthesis. 2022: p. 1-9. DOI: https://doi.org/10.1007/s12633-022-02077-9.
• 8. Michalak, M., L. Łatka, P. Sokołowski, R.T. Candidato, and A.J.B.o.t.P.A.o.S.T.S. Ambroziak, Effect of TiO₂ on the microstructure and phase composition of Al₂O₃ and Al₂O₃–TiO₂ APS sprayed coatings. 2021. 69(2). DOI: 10.24425/bpasts.2021.136735.
• 9. Mohammadian Bajgiran, M., M. Rezvani Rad, A. McDonald, and C. Moreau, Microstructure, phase and dielectric strength of thermally sprayed alumina layers in coating-based heating systems. 2021. 18(5): p. 1641-1656. DOI: https://doi.org/10.1111/ijac.13731.
• 10. Yusuf, Y., M.J. Ghazali, J.M. Juoi, T.A. Rahim, and Z. Mustafa, Plasma-sprayed TiO2 coatings: Hydrophobicity enhanced by ZnO additions. 2022. 19(4): p. 2213-2221. DOI: https://doi.org/10.1111/ijac.14009.
• 11. Basha G, M.T. and V. Bolleddu, Characteristics of Thermally Sprayed Alumina-Titania Ceramic Coatings obtained from Conventional and Nanostructured Powders - A Review. Australian Journal of Mechanical Engineering, 2021: p. 1-22. DOI: 10.1080/14484846.2021.1876603.
• 12. González-Rodriguez, J., J. Colín, S. Serna, B. Campillo, J.J.M.S. Albarran, and E. A, Effect of macroalloying with Cu on the corrosion resistance of rapidly solidified NiAl intermetallic in 0.5 M H2SO4. 2007. 448(1-2): p. 158-164. DOI: https://doi.org/10.1016/j.msea.2006.11.079.
• 13. Vidakis, N., A. Antoniadis, and N. Bilalis, The VDI 3198 indentation test evaluation of a reliable qualitative control for layered compounds. Journal of Materials Processing Technology, 2003. 143-144: p. 481-485. DOI: https://doi.org/10.1016/S0924-0136(03)00300-5.