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Austenitic stainless steels are high performance steels that have various applications in solid oxide fuel cells and boiler tubes under high temperature operating conditions. The Cr₂O₃ oxide layer formed on the steel surface becomes unstable at high temperatures and reduces the oxidation resistance of the steel. Therefore, protection of these steels at high temperatures is essential. Therefore, one of the best effective ways to extend the life of these components against oxidation is by applying protective coatings. In this research, Ni-Co-CeO₂-ZrO₂ composite coating was created by direct electrodeposition on the surface of AISI 304 austenitic stainless steel. In order to obtain proper coating, the effect of current density, pH and concentration of ZrO₂ in the bath was investigated. To create the optimum deposition, the bath parameters were investigated. Influence of ZrO₂ content (5, 10 and 25 g/L), current density (15, 20, 25 and 30 mA/cm^-2) and pH (3, 3.5, 4 and 4.5) on the deposition amount of ceramic particles and microstructure of the coating has been investigated. Scanning electron microscopy (SEM) and EDX analysis were used to determine the morphology. The results showed that with increasing ZrO₂, the amount of ZrO₂ deposition increased and the amount of CeO₂ deposition decreased. Also, with increasing current density and pH, the amount of ZrO₂ and CeO₂ particles decreased.

Keywords: Electroplating, Microstructure, ZrO2, CeO2.

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