It was pointed out that rare earth plays an important role in micro alloying, which led to the changes in the morphology, microstructure refining, and phase structure of the surface modification coatings and hence improved the properties of the coatings.

• 稀土元素在改性层中的作用机理为：稀土元素的微合金化作用，改变了改性层中第二相或夹杂物的形态与性能，改性层组织细化和结构因素，是材料表面改性层抗高温氧化和耐蚀性能得到改善的主要原因。