Abstract
CrN film was deposited on a WC-30Co substrate using the cathodic arc plasma deposition process, and the effects of annealing in nitrogen atmosphere and a vacuum chamber were investigated. CrN film comprises mainly CrN and β-Cr 2N phases. Annealed at high temperature, it is possible to decompose CrN to Cr and Cr 2N phase. The corrosion performance and hardness of CrN coating are both excellent. Micrographs of a coating after potentiodynamic tests still show homogeneous Cr- and N-rich phases on the corroded specimen. Annealed in an N 2 atmosphere at 1000 °C, the CrN-coated specimen has the best corrosion resistance and good hardness.
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