Porosity Reduction in New Thin Films of Ceramic Coatings on Stainless Steel by Annealing at Reduced Pressure
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New ZrOxNy thin films were deposited via reactive RF magnetron sputtering on stainless steel substrate from a Y2O3-doped ZrO2 (3YSZ) target. In order to reduce their porosity and increase corrosion resistance, the films were annealed at 265 °C in an inert atmosphere at reduced pressure, increasing their density and corrosion resistance in saline solution. The crystal structure of the films was characterized by means of X-ray diffraction, the morphology via scanning electron microscopy and atomic force microscopy, and the chemical composition via X-ray photoelectron spectroscopy. The corrosion resistance was evaluated using electrochemical techniques based on linear polarization. The results show that the annealing treatment decreases the morphological imperfections of the coatings such as pores and cracks, which allows increasing the corrosion resistance of the substrate-coating system.
This research was supported by the Fundación para la Promoción de la Investigación y la Tecnología, Asociación de Universidades Iberoamericanas, Ministry of Economy, Industry and Competitiveness of Spain/FEDER Program of the EU (MAT 2013-40823-R, MAT2014-60857-R, and CTQ2015-68951-C3-3-R), CSD2009-00013, and Universidad Nacional de Colombia Proyect DIB 35637.
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