Improved Corrosion Resistance and Mechanical Properties of CrN Hard Coatings with an Atomic Layer Deposited Al2O3 Interlayer

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• 作者：Zhixin Wan ; Teng Fei Zhang ; Han-Bo-Ram Lee ; Ji Hoon Yang ; Woo Chang Choi ; Byungchan Han ; Kwang Ho Kim ; Se-Hun Kwon
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：December 9, 2015
• 年：2015
• 卷：7
• 期：48
• 页码：26716-26725
• 全文大小：632K
• ISSN：1944-8252

文摘

A new approach was adopted to improve the corrosion resistance of CrN hard coatings by inserting a Al₂O₃ layer through atomic layer deposition. The influence of the addition of a Al₂O₃ interlayer, its thickness, and the position of its insertion on the microstructure, surface roughness, corrosion behavior, and mechanical properties of the coatings was investigated. The results indicated that addition of a dense atomic layer deposited Al₂O₃ interlayer led to a significant decrease in the average grain size and surface roughness and to greatly improved corrosion resistance and corrosion durability of CrN coatings while maintaining their mechanical properties. Increasing the thickness of the Al₂O₃ interlayer and altering its insertion position so that it was near the surface of the coating also resulted in superior performance of the coating. The mechanism of this effect can be explained by the dense Al₂O₃ interlayer acting as a good sealing layer that inhibits charge transfer, diffusion of corrosive substances, and dislocation motion.