CrN and CrCN coatings were deposited by the cathodic arc ion plating technique. Microstructures,
mechanical properties and tribological performances of the CrN and CrCN coatings in ambient air,
distilled water and seawater were comparatively investigated. Results showed that the amorphous
carbon and carbides were formed in the CrCN coating. The CrCN exhibited lower friction and wear than
the CrN in these three environments. The lower friction performance of the CrCN coating was closely
related to the self-lubricating amorphous carbon phase. While, the better anti-wear performance in
seawater could be attributed to the superior mechanical properties, the better anti-corrosion perfor-
mance and the lower friction shear