The electrochemical behavior of deposited chromium nitride (CrN) coatings on steel has been investigated in this study. The CrN coatings were prepared by using a reactive cathodic arc plasma deposition technology in an industrial scale. The microstructure and its crystallinity of the chromium nitride have been studied using x-ray diffraction and cross-sectional transmission electron microscopy. The CrN coatings exhibit a microcolumnar morphology. The aqueous corrosion behavior of the coatings was evaluated in a saline (3% NaCl solution) environment in terms of open-circuit potentials and polarization resistance (RP) resulting from electrochemical impedance spectroscopy. The results indicated that the CrN coatings are nobler than the uncoated steel and the R-p of the CrN coatings is at least one order of magnitude higher than that of uncoated steel. However, the R-p of the CrN coatings tend to decrease with immersion duration, showing that the corrosion changes from charge transfer to diffusion controlled, especially when the immersion time is long enough.