MATERIALS

Investigation of anticorrosive behavior of zirconia-titanium coatings in NaCl medium

  • 1 Institute of Metal Science, Equipment and Technologies with Hydro- and Aerodynamics Centre “Acad. A. Balevski”, Bulgarian Academy of Sciences, Sofia, Bulgaria
  • 2 Institute of General and Inorganic Chemistry
  • 3 Sofia University, Faculty of Chemistry and Pharmacy, Sofia, Bulgaria

Abstract

Sol gel TiO2-ZrO2 composite films were dip coated on stainless steel substrates and treated at 300, 400 and 500oC. The morphology and surface features were examined by Scanning electron microscopy (SEM) and X ray photoelectron spectroscopy (XPS). Xray diffraction analyses (XRD) was applied to investigate the phase composition. The corrosion resistances of the coatings were studied by evaluation of the weight loss in NaCl medium. According to XRD while the Zr-Ti composites are amorphous after treatment even at 500oC. The surfaces of the coatings possess typical island structure. The coatings, treated at 500oC ehxibit higher corrosion resistance than the other two type of samples. This could be explained by the amorphous structure of the composites, which lowers ion and electron conduction, high hydrophobicity and lower oxygen content.

Keywords

References

  1. A. Durán, Y. Castro, M. Aparicio, A. Conde & J. J. de Damborenea, Protection and surface modification of metals with sol–gel coatings, Intern. Mater. Rev. 52 (2007), pp. 175-192.
  2. N. Padhy, S. Kamal, R Chandra, U. K. Mudali, B. Raj, Corrosion performance of TiO2 coated type 304L stainless steel in nitric acid medium, Surf. Coat.Technol. 204 (2010), pp. 2782–2788.
  3. J. Yu, G.Jia, Q. Liu, J. Zhang, Z. Shi, Effect of sol-gel ZrO2 films on corrosion behavior of the 304 stainless steel in coal-gases environment at high temperature, Surf. Coat.Technol , 331 (2017), pp. 21–26.
  4. H. M. A. El-Lateef, M. Khalaf, Corrosion resistance of ZrO2– TiO2 nanocomposite multilayer thin films coated on carbon steel in hydrochloric acid solution, Mater. Character. 108 (2015), pp. 29– 41.
  5. Ghasemi,T., A. A. Shahrabi , H. O. Hassannehad, S. Sanjabi, Effect of heat treatment on corrosion properties of sol–gel titania–ceria nanocomposite coating, J. Alloys Comp. Vol. 504 (2010), pp. 237-242.
  6. H. Li, K. Liang, L. Mei, S. Gu,S. Wang, J. Mater. Sci., 20 (2001), pp. 1081.

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