Ni-base coatings for high temperature corrosion control

摘要

High temperature corrosion in power plants is a main breakdown criterion in boiler components applications. This study is focused on the high-temperature corrosion resistance of boiler Inconel nickel alloys like Inconel 625 and Inconel 686. Results indicated that corrosion wear of Ni-base coating depend on the chemical composition of combustion products. The combustion of waste producted the ashes. This work presents the causes and mechanisms of high-temperature corrosion of boiler elements during the waste incineration. Results of Ni-coated boiler tubes exposed the ashes and high temperature were performed using scanning electron microscopy supported by energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy (XPS) and HRTEM. On the surface of the Ni-base coating were obserwed Cr_2O_3. Paper presents the nature of grow and the changes of chemical composition of Cr_2O_3.