玻璃Cr2O3陶瓷涂层表面液态重金属润湿角的测量与表征

金属材料的腐蚀性能与其表面润湿特性有着密切的关系。采用亚音速火焰喷涂技术制备了玻璃-Cr2O3陶瓷涂层,设计了一套运行在高温环境中且密封的专用试验平台,研究经过不同保温时间后,重金属在45钢与喷有玻璃-Cr2O3陶瓷涂层的45钢表面的润湿角及相关现象的变化。结果表明:相同质量的重金属液滴在45钢表面的润湿角为18°,在玻璃-Cr2O3陶瓷涂层表面的润湿角为114°,玻璃-Cr2O3陶瓷涂层抗液态重金属润湿性能较好。固化后重金属颗粒与试样之间的接触面积及剪切强度均有所不同,304不锈钢与颗粒剪切强度为1.42MPa,而涂层与颗粒剪切强度为0.21MPa。

Measurement and Characterization of the Wetting Angle of Liquid Heavy Metal on Glass-Cr2O3 Ceramic Coating Surface

The corrosion resistance of metal materials is closely associated with the surface wetting property. A glass-Cr₂O₃ ceramic coating was prepared by subsonic flame spraying technology. Running in the high temperature environment, a sealed and specialized experimental platform was designed. The wetting behaviors of liquid heavy metal on 45 steel and glassCr2O3 ceramic coating surface were evaluated after different time of heat preservation. The results show that the wetting angle is 114° on the glass-Cr₂O₃ ceramic coating surface in contrast to 18° on the 45 steel surface for the same heavy metal droplet. The contact area and the shear strength between the solidified heavy metal particle and the specimens are different. The shear strength is 1.42 MPa and 0.21 MPa for the 304 stainless steel and the glass-Cr₂O₃ ceramic coatings surface between solidified heavy metal particles, respectively.