Ni-Al2O3 Composite Coating on AISI 430 Stainless Steel

Stainless steels are a wide range of alloys that are used in the chemical, oil and gas industries. Despite the use of these steels in equipment such as solid oxide fuel cells, turbine blades, heat exchangers, power plants, nuclear and aerospace industries, the performance of these steels is disturbed due to the high growth rate of the oxide layer. One of the ways to solve this problem is to apply An oxidation -resistant coating on the substrate. Nickel-based composite coating with oxide particles is one of the coatings with high resistance against wear, corrosion and oxidation. In the present study, Ni-Al2O3 composite coating was applied on AISI 430 steel by electroplating method. In order to investigate the oxidation behavior at high temperature, uncoated and coated AISI 430 steel were subjected to isothermal and cyclic oxidation tests at a temperature of 800 ºC. Scanning electron microscope (SEM) was used to observe morphology and X-ray diffraction was used to identify the phases. Results obtained showed that the coated samples were more resistant to oxidation than uncoated Ones, due to limiting the outward diffusion of chromium cations and the inward diffusion of oxygen anions.