Shi Xinlu, Cui Dandong, Wei Zheng, Hong Sheng
College of Mechanics and Materials, Hohai University, 8 Focheng West Road, Nanjing 211100, PR China.
College of Mechanics and Materials, Hohai University, 8 Focheng West Road, Nanjing 211100, PR China.
Ultrason Sonochem. 2023 Nov;100:106629. doi: 10.1016/j.ultsonch.2023.106629. Epub 2023 Oct 5.
The present study emphasizes the role of sulphide on ultrasonic cavitation erosion-corrosion (UCE-C) behaviors of HVOF-sprayed WC-CrC-Ni coating in 3.5 wt% NaCl solution with different sulphide concentrations. The results indicated that the ultrasonic cavitation erosion (UCE) resistance of the coating decreased significantly with increasing sulphide concentration. The coating reacted with oxygen and anion those transferred by UCE, and the cavitation impact force led to the lack of support for tungsten carbide particles, which resulted in the reduction in the mass of the coating. There were two main factors those affected the UCE-C mechanism, in which the passivation film helped to reduce the mass loss of the coating, while the impact force caused by cavitation destroyed the passivation film, led to the accelerated anion diffusion and ultimately accelerated the mass loss of the coating. Mechanical erosion dominated the UCE-C of the coating in all tested solutions.
本研究着重探讨了在不同硫化物浓度的3.5 wt% NaCl溶液中，硫化物对高速火焰喷涂WC-CrC-Ni涂层超声空蚀腐蚀（UCE-C）行为的作用。结果表明，随着硫化物浓度的增加，涂层的抗超声空蚀（UCE）性能显著下降。涂层与超声空蚀传递的氧和阴离子发生反应，空蚀冲击力导致碳化钨颗粒失去支撑，从而使涂层质量减少。有两个主要因素影响UCE-C机制，其中钝化膜有助于减少涂层的质量损失，而空蚀产生的冲击力破坏了钝化膜，导致阴离子扩散加速，最终加速了涂层的质量损失。在所有测试溶液中，机械侵蚀在涂层的UCE-C过程中起主导作用。
