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Korean Journal of Metals and Materials > Volume 55(4); 2017 > Article
Korean Journal of Metals and Materials 2017;55(4): 222-226. doi: https://doi.org/10.3365/KJMM.2017.55.4.222
High-temperature Corrosion of AlCrTiSiN Film in Ar-1%SO2 Gas
Poonam Yadav1, Sik Chol Kwon2, Yue Lin3, Shihong Zhang3, Dong Bok Lee1
1School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
2Department of Advanced Materials Engineering, Chungbuk National University, Cheongju 28644, Republic of Korea
3School of Materials Science & Engineering, Anhui University of Technology, Maanshan 243002, PR China
Correspondence  Dong Bok Lee ,Tel: +82-31-290-7355, Email: dlee@skku.ac.kr
Received: 26 July 2016;  Accepted: 25 October 2016.  Published online: 6 April 2017.
ABSTRACT
An AlCrTiSiN film composed of 31Al-15Cr-1.7Ti-0.5Si-51.8N (at%) was deposited on a steel substrate by arc ion plating to a thickness of 1 μm. It consisted of nano crystalline hcp-AlN and fcc-CrN. Its corrosion behavior in Ar-1%SO2 gas at 800 ℃ for 5-50 h was studied. The resulting scales consisted primarily of Al2O3 and Cr2O3, which effectively suppressed the corrosion. No sulfides formed, because Al and Cr oxidized competitively from the surface. The film was primarily corroded by the inward diffusion of oxygen and a much smaller amount of sulfur.
Keywords: thin films, vapor deposition, corrosion property, transmission electron microscopy (TEM), AlCrTiSiN
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