In order to study the effect of magnetron sputtering pulse frequency on the microstruc-ture and corrosion resistance of Cr/C coatings prepared at 200,300,400,500 and 600 Hz,the phase composition,microstructure and corrosion resistance are analyzed by XRD,SEM and elec-trochemical workstation.The results show that the phase composition of Cr/C coatings prepared under different pulse frequencies is the same,all of which are Cr7C3.The surface morphology of Cr/C coatings is cauliflower particles,and the cross-section structure is columnar crystal.With the increase of pulse frequency,the microstructure of Cr/C coating becomes coarser,the gaps between the columnar crystals increases,the densification decreases,the surface roughness increa-ses,the thickness of the coating increases,and the average deposition rate of the coating increases from 18.45 nm·min-1to 28.08 nm·min-1.When the pulse frequency is 500 Hz,the corrosion potential of the coating is the highest,the corrosion current is the lowest,and the corrosion rate is only 0.002 96 mm·a-1.
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