Preparation of newly developed CeO2/ZrO2 multilayers: Effect of the treatment temperature on the structure and corrosion performance of stainless steel
| Autor: | M. Shipochka, Vladimir Blaskov, St. Yordanov, O. Dimitrov, Stanislav V. Vassilev, Nikolai Boshkov, Irina Stambolova |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Zirconium dioxide Scanning electron microscope Mechanical Engineering Metals and Alloys 02 engineering and technology Surface finish 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Corrosion law.invention chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Mechanics of Materials law Materials Chemistry Crystallite Crystallization Composite material 0210 nano-technology Layer (electronics) |
| Zdroj: | Journal of Alloys and Compounds. 806:1357-1367 |
| ISSN: | 0925-8388 |
| Popis: | One-component CeO2 coatings and bi-component CeO2/ZrO2 multilayer coatings were obtained by a sol gel process. The phase composition, surface morphology and roughness of the samples were studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), Atomic force microscopy (AFM) and X-ray scanning electron microscopy (XPS). The corrosion resistance and protective ability were characterized by using salty solution of 3.5% NaCl at 25 °C. The multilayer configuration of CeO2 and ZrO2 ensure enhanced protection of the steel in comparison to the single CeO2 coatings and uncoated steel. The surface morphology and anticorrosion properties depend significantly on the treatment temperature of both CeO2 underlayer and ZrO2 top layer. At lower treatment temperatures, they are relatively dense and smooth. The corrosion resistance of the multilayers slows down, when ZrO2 coatings were heated above 500 °C. This probably is due to the more pronounced crystallization of cubic zirconium dioxide, resulting in deeper boundaries between the individual grains. The protective properties of a CeO2/ZrO2 multilayers could be attributed to the low crystallized structure with very fine crystallites. Potentiodynamic measurements showed that all multilayer systems have more negative corrosion potential values compared to the corrosion potential of the steel substrate and will protect it in the case of corrosion attack due to electrochemical reasons. |
| Databáze: | OpenAIRE |
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