Steel base surface alloying-ion nitriding wear-resistant corrosion-resistant composite modified layer and preparation method thereof

The invention relates to the field of metallic materials, and in particular relates to a steel base surface alloying-ion nitriding wear-resistant corrosion-resistant composite modified layer and a preparation method thereof. An alloying technique is combined with a rare-earth catalytic ion nitriding technology, and the Cr-Ni-Ti-La alloying-ion nitriding wear-resistant corrosion-resistant compositemodified layer is prepared on the steel base surface. The problems that carbon steel is low in nitriding speed, long in production cycle, low in efficiency, shallow in nitriding layer, large in hardness gradient and relatively high in brittleness in the conventional nitriding treatment, and the occurrence of brittle spalling of the nitriding layer in fatigue wear is easily caused, and the wear resistance and corrosion resistance are relatively low in improvement degree compared with that of a matrix can be solved. 本发明涉及金属材料领域，特别涉及种钢基表面合金化-离子渗氮耐磨耐蚀复合改性层及其制备方法，将合金化技术与稀土催化离子渗氮技术结合起来，在钢基表面制备了Cr-Ni-Ti-La合金化-离子渗氮耐磨耐蚀复合改性层，