把一种或几种元素渗入基体金属(或合金),改变其表层成份和组织,并提高其使用性能的方法,称为表面合金化或化学热处理。化学热处理的原理以及在钢铁基体上渗碳、碳氮共渗、氮化、渗硼、碳氮硼三元共渗、渗硫、硫氮及硫碳氮共渗等,巳在本手册第44篇的化学热处理章中作了介绍。本章只着重介绍渗铝、渗硅、渗钒、渗铬、渗锌 The method of infiltrating one or several elements into the base metal (or alloy), changing its surface composition and texture, and improving its serviceability is called surface alloying or chemical heat treatment. The principles of chemical heat treatment, as well as carburizing, carbonitriding, nitriding, boronizing, carbonitriding, ternary infiltration, sulfurizing, sulfurizing and sulfurizing carbonitriding on steel substrates, are described in section 44 Chapter chemical heat treatment chapter was introduced. This chapter only focuses on aluminizing, silicon infiltration, vanadizing, chromizing, infiltration of zinc