The tribological properties of CrSiN coatings were investigated under dry and wet conditions. CrSiN films (2μm thick) were deposited on 301 stainless steel substrates by dual magnetron sputtering, using a chromium interface layer (500nm thick) on the top of plasma nitrided surface. The morphology and microstructure of the CrSiN films were examined by SEM, EDS and X-ray diffractometry. Dry and wet wear tests were performed using a linear reciprocating ball-on-flat tribometer. In wet condition, the contact was immersed in NaCl 1wt.%, and the sliding wear tests were performed at open circuit potential (OCP), and under cathodic and anodic conditions.CrSiN films were found to exhibit excellent wear resistance under dry condition: the films had no tendency to delaminate after 1800 cycles of sliding wear under 1.6GPa Hertzian stress. However, under wet condition, the wear resistance was rather poor: the films detached from the substrate at smaller contact pressures (1.2GPa). It was demonstrated that the corrosion reactions at the electrode/electrolyte interface were the reason for the degradation of the tribological properties of these films; in the absence of corrosion reactions (under cathodic polarization), CrSiN coatings were found to resist much better sliding wear.