High-temperature Corrosion of CrAlSiN Films in Ar/1%SO₂ Gas

다국어 초록 (Multilingual Abstract)

Nano-multilayered Cr25.2Al19.5Si4.7N50.5 films were deposited on the steel substrate by cathodic arc plasma deposition. They were corroded at 900℃ in Ar/1%SO₂ gas in order to study their corrosion behavior in sulfidizing/oxidizing environments. Despite the presence of sulfur in the gaseous environment, the corrosion was governed by oxidation, leading to formation of protective oxides such as Cr₂O₃ and α-Al₂O₃, where Si was dissolved. Iron diffused outward from the substrate to the film surface, and oxidized to Fe₂O₃ and Fe₃O₄. The films were corrosion-resistant up to 150 h owing to the formation of thin (Cr₂O₃ and/or α-Al₂O₃)-rich oxide layers. However, they failed when corroded at 900℃ for 300 h, resulting in the formation of layered oxide scales due to not only outward diffusion of Cr, Al, Si, Fe and N, but also inward movement of sulfur and oxygen.

목차 (Table of Contents)

• Abstract
• 1. Introduction
• 2. Experimental Details
• 3. Results and Discussion
• 4. Conclusion
• References