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

Zhixin Wan, Teng Fei Zhang, Han Bo Ram Lee, Ji Hoon Yang, Woo Chang Choi, Byungchan Han, Kwang Ho Kim, Se Hun Kwon

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)26716-26725
Number of pages10
JournalACS Applied Materials and Interfaces
Volume7
Issue number48
DOIs
Publication statusPublished - 2015 Dec 9

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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