Materials Science. Non-Equilibrium Phase Transformations.
Vol. 6 (2020), Issue 1, pg(s) 15-16

Enhancement of corrosion resistance of steel, coated with various coatings on the base of SiO2, TiO2, ZrO2 and CeO2

  • 1 Bulgarian Academy of Sciences, Institute of Metal Science, Equipment and Technologies with Hydro and Aerodynamics Centre “Acad. A. Balevski”
  • 2 Bulgarian Academy of Sciences, Institute of General and Inorganic Chemistry
  • 3 Bulgarian Academy of Sciences, Institute of Physical Chemistry “Rostislaw Kaishev

Abstract

Different corrosion-resistant coatings based on various SiO2, TiO2, ZrO2 and CeO2oxides have been applied to various steels by the sol-gel method and spray pyrolysis. The obtained experimental coatings were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and weight loss measurements in 3.5% NaCl medium. TiO2 / SiO2 and CeO2/SiO2 coatings treated at lower temperatures (500oC) have been shown to exhibit higher corrosion resistance than ZrO2/SiO2 samples. Increasing the treatment temperature decreases the protective properties of the invesitgated coatings. The enhanced protective properties of TiO2/SiO2 are probably due to their low crystallized fine grained structure and relatively dense surface without visible cracks.

Keywords

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