Effect of duty cycle on microstructure, composition and ablation resistance of tungsten-cobalt coatings prepared by electrodeposition

In order to explore the ablation resistance of the tungsten-cobalt coating, tungsten-cobalt coatings with different tungsten contents were prepared on the surfaces of PCrNi3MoVA steels by electrodeposition under different duty cycles. The results show that the tungsten content in the coating increases first and then decreases with the increase of the duty cycle. When the duty cycle is 30%, the tungsten content is the highest (43.37wt%). The grain size increases with the increase of the duty cycle. The sample prepared at the duty cycle of 30% has the best ablation resistance, and its relative mass ablation rate and relative line ablation rate are 0.08% and 0.89%, respectively. The effect of duty cycle on ablation resistance of the tungsten-cobalt coating is mainly achieved by affecting the tungsten content and the grain size in the coating. Higher tungsten content and denser crystal, the ablation resistance of tungsten-cobalt coating is better.