Seawater cavitation resistance of supersonic sprayed nano-WC-10Co4Cr and WC-12Co coatings
FU Li1,2, LIU Wei1,2, CHEN Xiaoming1,2, ZHAO Jian1,2, LI Yuluo3, ZHANG Lei1,2
1. Key Laboratory of Surface Engineering of Equipment for Hydraulic Engineering of Zhejiang Province,Standard and Quality Control Research Institute, Ministry of Water Resources, Hangzhou 310012, China; 2. Water Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province,Hangzhou Mechanical Design and Research Institute, Ministry of Water Resources, Hangzhou 310012, China; 3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Abstract：In order to improve the seawater resistance of marine equipment, WC-10Co4Cr coating and WC12-Co coating were prepared on the 45# steel matrixes using supersonic flame spraying technology (HVOF). The microstructures of WC-10Co4Cr, WC12-Co powders and coatings were analyzed by scanning electron microscope (SEM), and the porosity, microhardness, and electrochemical properties of the coating were tested. The coatings and substrate were subjected to a seawater cavitation resistance comparison experiment under 3.5%NaCl solution. The mechanism of coating seawater cavitation was discussed. The results show that the porosity of WC-10Co4Cr coating prepared by HVOF is 0.42%, the microhardness of the coating is 1 317 HV0.2. The porosity of the WC-12Co coating is 0.54%, and the microhardness of the coating is 1 253 HV0.2. The corrosion resistance of WC-10Co4Cr coating is better than that of WC-12Co coating. The impact toughness of WC-10Co4Cr coating is slightly better than that of WC-12Co coating. For seawater cavitation resistance, WC-10Co4Cr coating is better than WC-12Co coating, and WC-12Co coating is better than 45# steel. The micro--holes and cracks of WC-10Co4Cr coating and WC-12Co coating were expanded and fallen off under the action of cavitation impact force, internal stress, and Cl− in seawater.
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2020, Vol. 25 
