采用大气等离子喷涂方法在马氏体钢基体上制备TiC+(Al2O3/TiC)+Al2O3复合涂层。对涂层的抗热冲击性能、热氧化处理前后截面形貌及成分进行了分析,利用电化学方法测量涂层的耐腐蚀性能。结果表明,这种复合涂层在高温下具有良好的自愈合能力及抗热冲击性能,涂层样品在800、700、600℃和500℃下的抗热冲击次数分别达到了157、125、95次和83次;在600℃经过30 h热氧化处理之后,涂层的耐腐蚀性能提高了近1个数量级,孔隙率下降了90%以上。能谱分析表明,涂层中TiC在高温下的氧化产物填充并愈合了涂层中的裂纹与孔隙,起到了自愈合的作用。 TiC + (Al2O3 / TiC) + Al2O3 composite coatings were prepared on martensitic steel substrates by atmospheric plasma spraying. Thermal shock resistance of the coating, cross-sectional morphology and composition before and after thermal oxidation were analyzed, and the corrosion resistance of the coating was measured by electrochemical method. The results show that the composite coating has good self-healing ability and thermal shock resistance under high temperature. The number of thermal shock resistance of the coating sample reaches 157, 125 at 800, 700, 600 and 500 respectively, 95 times and 83 times. After 30 hours thermal oxidation at 600 ℃, the corrosion resistance of the coatings increased by nearly one order of magnitude and the porosity decreased by more than 90%. EDS analysis showed that the TiC in the coating at high temperature oxidation products filled and healed the cracks and pores in the coating, played a self-healing role.