Objective WC10Co4Cr coatings prepared by high velocity air plasma (HVAP) and high velocity oxy-fuel spraying (HVOF) were comparatively studied, and the advantages and disadvantages of the two technologies were judged by the morphology and electrochemical property of the coatings prepared. Methods The microstructure and phase constitution of the WC10Co4Cr composite coatings were analyzed by SEM and XRD, and the electrochemical analysis of the coatings was performed in 3. 5% (mass fraction) NaCl solution. Results The morphology results showed that the coatings were composed of relatively large WC ceramic particles and metallic binders, and lamellar structures were formed during the coating process by the steady accumulation of WC particles. The coatings showed a small degree of carbon loss, and formed W2C with brittleness. The potentiodynamic polarization test revealed that the WC10Co4Cr coating prepared by HVAP showed excellent electrochemical corrosion resistance. Conclusion The WC10Co4Cr coating prepared by HVAP had a microhardness of 1197HV, a porosity of 0. 50% , a corrosion potential of -0. 3947 V, a corrosion current density of 9. 19×10 -7 A / cm2 , a corrosion rate of 1. 01×10 -2 g / (m2 ·h), and a corrosion depth of 1. 09×10 -2 mm / a, and showed a similar corrosion resistance with the coating prepared by HVOF.