Article ID Journal Published Year Pages File Type
1623885 Journal of Alloys and Compounds 2008 12 Pages PDF
Abstract

Ni–5Al coating was deposited on Ni- and Fe-based superalloys by high velocity oxy fuel (HVOF) process to enhance their high-temperature corrosion resistance. Hot corrosion studies were conducted on bare as well as HVOF-coated superalloy specimens after exposure to a molten salt environment at 900 °C under cyclic conditions. Each cycles consisted of 1 h heating in the silicon carbide tube furnace followed by 20 min cooling in air. Thermogravimetric technique was used to approximate the kinetics of corrosion. Techniques like X-ray diffraction (XRD), scanning electron microscopy/energy dispersive X-ray analysis (SEM/EDAX) were used to characterize the corrosion products. The coatings and the oxide scale formed on the exposed surface were found to be intact with the superalloys. Superfer 800 with Ni–5Al coating has provided a good protection to the superalloys in the given molten salt environment.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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