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Short‐term oxidation and hot corrosion resistance of a gradient CrN/Cr1−xAlxN coating |
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| Authors: | M Zhu M S Li J J Xu Y C Zhou |
| Affiliation: | 1. High‐Performance Ceramic Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (P. R. China);2. Xi'an University of Science and Technology, College of Material Science and Engineering, Xi'an 710054 (P. R. China) |
| Abstract: | A CrN/Cr1?xAlxN coating comprised of an inner layer of CrN and an outer layer of Cr1?xAlxN with a gradient distribution of Al was deposited on two different alloys by a reactive sputtering method. Oxidation and hot‐corrosion tests of the gradient CrN/Cr1?xAlxN coating were performed at different temperatures. The phase compositions and morphologies of the as‐deposited coating and the corrosion products were investigated by using XRD and SEM/EDS. The results showed that the gradient CrN/Cr1?xAlxN coating exhibited good oxidation resistance at temperatures above 1000 °C owing to the formation of an α‐Al2O3‐rich oxide scale. The coating possessed good hot‐corrosion resistance in molten sulfate because the inner CrN layer could supply enough Cr to form a relatively protective Cr2O3 after the Al2O3‐enriched scale failed due to its dissolution in the molten sulfate. |
| Keywords: | gradient CrN/Cr1− xAlxN coating hot‐corrosion magnetron sputtering oxidation |
