Abstract
In this study, a variety of magnetron sputtered binary and ternary thin film (approximately 1.5 µm thick) coatings using Cr, Al, and C as base elements were deposited onto Ni-201 alloy and investigated before and after exposure to simulated Type II Hot Corrosion environment. Prototypical Na2SO4 was applied to the samples before exposure for 250 hours in an air/SO2 gas mixture at 700 °C. It was determined that all coatings reduced the samples specific mass gains (corrosion rates) when compared to uncoated ones. Binary Al – C and Cr – C coatings were completely dissolved after exposure testing and NiO was the only compound detected on the surfaces; whereas continuous layers of and were detected in Cr – Al and Cr – Al – C coated samples, indicating good protection against Type II Hot Corrosion.
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