Abstract
Abstract In this study, the cathodic arc deposition technique was utilized to synthesize three Cr-N-O coatings (chromium nitride [CrN], CrN/Cr[N,O], CrN/chromium oxide [Cr2O3]) on AISI M2 tool steel by using the chromium target and controlling the flow rate of nitrogen/oxygen reactive gases. Polarization tests were performed to evaluate the corrosion resistance of the uncoated and coated specimens in 3.5 wt% sodium chloride (NaCl) solution. Structure and morphology of the coatings were separately analyzed using x-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) to better understand the coating effects on the corrosive behavior of M2 steel. The results showed that the CrN/Cr(N,O) and CrN/Cr2O3 double-layered coatings had higher surface roughness than monolithic CrN, but their dense and double-layered structures resulted in better corrosion resistance. The sequence of corrosion resistance is in the order of CrN/Cr(N,O) > CrN/Cr2O3 > CrN > uncoated M2 stee...
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