针对连续热镀锌生产线中浸锌零部件表面的腐蚀磨损问题,应用高能高速等离子喷涂设备制备了Al2O3-TiB2复合陶瓷涂层.测试了涂层的显微组织、显微硬度、结合强度及耐熔融锌液腐蚀性能.结果表明涂层显微组织中不存在相互贯通的孔隙、微裂纹和未熔化颗粒,孔隙分布均匀且孔径较小,孔隙率＜3％.涂层与基体结合状态良好,结合强度达到56 MPa.经过30天的熔融锌液浸泡,涂层表面未见有点蚀、裂纹或剥落现象.Al2O3-TiB2复合陶瓷涂层高的致密性和较好的抗热震性能对涂层力学性能和耐熔融锌液腐蚀性能提高起到了重要作用.%Aiming at the wear and corrosion of the immersed parts in continuous hot-galvanizing lines, the AI2O3-T1B2 composite ceramic coating was prepared by the high - energy and high - speed plasma - spraying equipment. The micro-structure, microhardness, bonding strength and corrosion resistance to molten zinc of the coatings were studied. The results showed that there was no interconnected pores, microcracks and unmelted particles in the coating, the pores were tiny and distributed symmetrical, the porosity was less than 3%, the coating was combined well with base material,and the bond strength could reach 56 Mpa. After 30 days' immersed in molten zinc, the corrosion point, cracks and peeling off could not be watched on the surface. The high density and good thermal shock resistance of Al2 O3 -TiB2 composite ceramic coating played an important role in improving the mechanical properties and the corrosion resistance to molten zinc.
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