It has been proved that rare earth La also pe-rmeates into the layer and acts as an alloying element during the process of ni-tro-carbo-boronizing witn ion microanalysis.

• 使材料的耐磨性、耐蚀性获得了明显提高，离子探针检测证实，稀土元素镧也渗入了钢的表面，起到了微合金化的作用。