In the present work, the conditions for electrophoretic deposition of yttria-stabilised zirconia (YSZ) nanopowder have been investigated. For this purpose, the mixture of acetyl acetone and ethanol with different mixing ratios was used as solvent with iodine as a dispersant. To achieve a smooth, homogeneous and crack-free coatings, the following parameters were chosen to be optimised: the mixing ratio of acetyl acetone and ethanol, voltage and duration of deposition. The obtained coatings were observed by scanning electron microscope and optical microscope. The weight of deposits was also measured in different deposition conditions to observe the effects of above-mentioned parameters on the weight and consequently the quality of green coatings. All in all, the suspensions which composed of 50 vol% acetylacetone + 50 vol% ethanol led to more uniformity and fewer cracks/pores in deposits. The other parameters were optimised as follows: deposition voltage of 40 V and deposition time of 3 min. The results of polarisation test showed an improved corrosion resistance of the magnesium alloy with the application of YSZ coating, so that the I _corr value decreased from 1.16 to 0.088 mA.

References

1. 1)
  - 29. Kawakita, M., Uchikoshi, T., Kawakita, J., et al: ‘Preparation of crystalline-oriented titania photoelectrodes on ITO glasses from a 2-propanol-2,4-pentanedione solvent by electrophoretic deposition in a strong magnetic field’, J. Am. Ceram. Soc., 2009, 92, pp. 984–989 (doi: 10.1111/j.1551-2916.2009.02947.x).
2. 2)
  - 23. Aruna, S.T., Rajam, K.S.: ‘A study on the electrophoretic deposition of 8YSZ coating using mixture of acetone and ethanol solvents’, Mater. Chem. Phys., 2008, 111, pp. 131–136 (doi: 10.1016/j.matchemphys.2008.03.035).
3. 3)
  - 16. Hornberger, H., Virtanen, S., Boccaccini, A.R.: ‘Biomedical coatings on magnesium alloys – a review’, Acta Biomat., 2012, 8, pp. 2442–2455 (doi: 10.1016/j.actbio.2012.04.012).
4. 4)
  - 19. Hamdy, A.S., Farahat, M.: ‘Chrome-free zirconia-based protective coatings for magnesium alloys’, Surf. Coat. Technol., 2010, 204, pp. 2834–2840 (doi: 10.1016/j.surfcoat.2010.02.063).
5. 5)
  - 13. Corni, I., Ryan, M.P., Boccaccini, A.R.: ‘Electrophoretic deposition: from traditional ceramics to nanotechnology’, J. Eur. Ceram. Soc., 2008, 28, pp. 1353–1367 (doi: 10.1016/j.jeurceramsoc.2007.12.011).
6. 6)
  - 3. Guo, K.W.: ‘A review of magnesium/magnesium alloys corrosion and its protection’, Recent Pat. Corros. Sci., 2010, 2, pp. 13–21 (doi: 10.2174/1877610801002010013).
7. 7)
  - 17. Zhu, R., Zhang, J., Chang, C., et al: ‘Effect of silane and zirconia on the thermal property of cathodic electrophoretic coating on AZ31 magnesium alloy’, J. Magnesium Alloy, 2013, 1, pp. 235–241 (doi: 10.1016/j.jma.2013.08.001).
8. 8)
  - 26. Jia, L., Lu, Z., Huang, X., et al: ‘Preparation of YSZ film by EPD and its application in SOFCs’, J. Alloys Compd., 2006, 424, pp. 299–303 (doi: 10.1016/j.jallcom.2005.12.065).
9. 9)
  - 1. Zhao, M.C., Liu, M., Song, G., et al: ‘Influence of the β-phase morphology on the corrosion of the Mg alloy AZ91’, Corros. Sci., 2008, 50, pp. 1939–1953 (doi: 10.1016/j.corsci.2008.04.010).
10. 10)
  - 21. Lee, Y.H., Kuo, C.W., Shih, C.J., et al: ‘Characterization on the electrophoretic deposition of the 8 mol% yttria-stabilized zirconia nanocrystallites prepared by a sol–gel process’, Mater. Sci. Eng. A, 2007, 445–446, pp. 347–354 (doi: 10.1016/j.msea.2006.09.049).
11. 11)
  - 9. Wang, Q., Spencer, K., Birbilis, N., et al: ‘The influence of ceramic particles on bond strength of cold spray composite coatings on AZ91 alloy substrate’, Surf. Coat. Technol., 2010, 205, pp. 50–56 (doi: 10.1016/j.surfcoat.2010.06.008).
12. 12)
  - 20. Maleki-Ghaleh, H., Rekabeslami, M., Shakeri, M.S., et al: ‘Nano-structured yttria-stabilized zirconia coating by electrophoretic deposition’, Appl. Surf. Sci., 2013, 280, pp. 666–672 (doi: 10.1016/j.apsusc.2013.04.173).
13. 13)
  - 5. Zhao, Q., Guo, X., Dang, X., et al: ‘Preparation and properties of composite MAO/ECD coatings on magnesium alloy’, Colloids Surf. B, Biointerfaces, 2013, 102, pp. 321–326 (doi: 10.1016/j.colsurfb.2012.07.040).
14. 14)
  - 8. Christoglou, C., Voudouris, N., Angelopoulos, G.N., et al: ‘Deposition of aluminium on magnesium by a CVD process’, Surf. Coat. Technol., 2004, 184, pp. 149–155 (doi: 10.1016/j.surfcoat.2003.10.065).
15. 15)
  - 28. Ahmadi, M., Aghajani, H.: ‘Suspension characterization and electrophoretic deposition of yttria-stabilized zirconia nanoparticles on an iron-nickel based super alloy’, Ceram. Int., 2017, 43, (9), pp. 7321–7328 (doi: 10.1016/j.ceramint.2017.03.035).
16. 16)
  - 25. Xu, Z., Rajaram, G., Sankar, J., et al: ‘Electrophoretic deposition of YSZ electrolyte coatings for solid oxide fuel cells’, Surf. Coat. Technol., 2006, 201, pp. 4484–4488 (doi: 10.1016/j.surfcoat.2006.08.045).
17. 17)
  - 14. Stappers, L., Zhang, L., Van der Biest, O., et al: ‘The effect of electrolyte conductivity on electrophoretic deposition’, J. Colloid Interface Sci., 2008, 328, pp. 436–446 (doi: 10.1016/j.jcis.2008.09.022).
18. 18)
  - 20. Das, D., Basu, R.N.: ‘Suspension chemistry and electrophoretic deposition of zirconia electrolyte on conducting and non-conducting substrates’, Mater. Res. Bull., 2013, 48, pp. 3254–3261 (doi: 10.1016/j.materresbull.2013.05.034).
19. 19)
  - 2. ‘ASM handbook, vol. 2, properties and selection: nonferrous alloys and special-purpose materials’ (ASM International, OH, 1992, 2nd edn.).
20. 20)
  - 24. Bai, M., Guo, F., Xiao, P.: ‘Fabrication of thick YSZ thermal barrier coatings using electrophoretic deposition’, Ceram. Int., 2014, 40, pp. 16611–16616 (doi: 10.1016/j.ceramint.2014.08.021).
21. 21)
  - 10. Miao, Q., Cui, C.E., Pan, J.D.: ‘CrN–TiN multilayer coating on magnesium alloy AZ91 by arc-glow plasma depositing process’, Surf. Coat. Technol., 2007, 201, pp. 5077–5080 (doi: 10.1016/j.surfcoat.2006.07.195).
22. 22)
  - 30. Sakka, Y., Uchikoshi, T.: ‘Forming and microstructure control of ceramics by electrophoretic deposition (EPD)’, KONA Powder Part. J., 2010, 28, pp. 74–90 (doi: 10.14356/kona.2010009).
23. 23)
  - 18. Chen, F., Liu, M.: ‘Preparation of yttria-stabilized zirconia (YSZ) films on La0.85Sr0.15MnO3 (LSM) and LSM-YSZ substrates using an electrophoretic deposition (EPD) process’, J. Eur. Ceram. Soc., 2001, 21, pp. 127–134 (doi: 10.1016/S0955-2219(00)00195-3).
24. 24)
  - 4. Czerwinski, F.: ‘Magnesium alloys – corrosion and surface treatments’ (INTECH, India, 2011).
25. 25)
  - 6. Wang, H., Akid, R., Gobara, M.: ‘Scratch-resistant anticorrosion sol–gel coating for the protection of AZ31 magnesium alloy via a low temperature sol–gel route’, Corros. Sci., 2010, 52, pp. 2565–2570 (doi: 10.1016/j.corsci.2010.04.002).
26. 26)
  - 23. Laxmidhar, B., Liu, M.: ‘A review on fundamentals and applications of electrophoretic deposition (EPD)’, Prog. Mater. Sci., 2007, 52, (1), pp. 1–61 (doi: 10.1016/j.pmatsci.2006.07.001).
27. 27)
  - 22. Talebi, T., Raissi, B., Maghsoudipour, A.: ‘The role of addition of water to non-aqueous suspensions in electrophoretically deposited YSZ films for SOFCs’, Int. J. Hydrog. Energy, 2010, 35, pp. 9434–9439 (doi: 10.1016/j.ijhydene.2009.12.152).
28. 28)
  - 11. Zhu, L., Li, W., Shan, D.: ‘Effects of low temperature thermal treatment on zinc and/or tin plated coatings of AZ91D magnesium alloy’, Surf. Coat. Technol., 2006, 201, pp. 2768–2775 (doi: 10.1016/j.surfcoat.2006.05.024).
29. 29)
  - 27. Panigrahi, S., Besra, L., Singh, B.P., et al: ‘Electrophoretic deposition of doped ceria in anti-gravity set-up’, Adv. Powder Technol., 2011, 22, pp. 570–575 (doi: 10.1016/j.apt.2010.08.005).
30. 30)
  - 7. Hoche, H., Blawert, C., Broszeit, E., et al: ‘Galvanic corrosion properties of differently PVD-treated magnesium die cast alloy AZ91’, Surf. Coat. Technol., 2005, 193, pp. 223–229 (doi: 10.1016/j.surfcoat.2004.08.147).

Nano3YSZ electrophoretic deposition from acetylacetone + ethanol solvent on the surface of AZ91 magnesium alloy

References

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