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Resistance to Corrosion of Zirconia Coatings Deposited by Spray Pyrolysis in Nitrided Steel |
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| Authors: | G. I. Cubillos J. J. Olaya M. Bethencourt G. Cifredo G. Blanco |
| Affiliation: | 1. College of Science, Chemistry Department, National University of Colombia, Bogotá, Colombia 2. College of Engineering, Department of Mechanical Engineering and Mechatronics, National University of Colombia, Bogotá, Colombia 3. Materials Science and Metallurgical Engineering Department, and Inorganic Chemistry Department, University of Cadiz, Marine Science and Technology Center of Andalucía, International Campus of Excellence of the Sea (CEI·MAR), Avda. República de Saharaui, Puerto Real, 11510, Spain 4. College of Sciences, Materials Science and Metallurgical Engineering Department, and Inorganic Chemistry Department, University of Cadiz, Avda. República de Saharaui, Puerto Real, 11510, Spain |
| Abstract: | Coatings of zirconium oxide were deposited onto three types of stainless steel, AISI 316L, 2205, and tool steel AISI D2, using the ultrasonic spray pyrolysis method. The effect of the flux ratio on the process and its influence on the structure and morphology of the coatings were investigated. The coatings obtained, 600 nm thick, were characterized using x-ray diffraction, scanning electron microscopy, confocal microscopy, and atomic force microscopy. The resistance to corrosion of the coatings deposited over steel (not nitrided) and stainless steel nitrided (for 2 h at 823 K) in an ammonia atmosphere was evaluated. The zirconia coating enhances the stainless steel’s resistance to corrosion, with the greatest increase in corrosion resistance being observed for tool steel. When the deposition is performed on previously nitrided stainless steel, the morphology of the surface improves and the coating is more homogeneous, which leads to an improved corrosion resistance. |
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