以K417G为基体,预置La2O3-Ni复合电镀层,采用粉末包埋法进行渗铝,且在恒温条件下对渗铝试样进行高温氧化试验,重点研究了稀土La对渗铝涂层的表面改性和作用机理。分析发现,稀土元素La对渗铝过程有促进作用,并且使得渗层组织细小均匀,表面质量好;高温氧化过程中,渗铝层的外表面形成了致密的氧化膜,降低了氧化增重速率,使涂层具有较好的抗高温氧化性能。 With K417G as substrate, La2O3-Ni composite plating layer was pre-coated, aluminized by powder embedding method, and high temperature oxidation test was carried out on aluminized samples under constant temperature. The effects of rare earth La on the surface of aluminized coating Modification and mechanism of action. It is found that the rare earth element La can promote the aluminizing process and make the microstructure of the nitrided layer fine and uniform and the surface quality is good. During the high temperature oxidation process, the dense oxide film is formed on the outer surface of the aluminized layer, which reduces the rate of oxidation and weight gain , So that the coating has good resistance to high temperature oxidation.