一、前言许多渗碳零件(或是碳氮共渗零件)往往有一些部位不希望渗碳(或碳氮共渗)。过去常采用的方法是:切去渗碳层或镀铜来达到此目的。切碳的方法虽然可靠,但费工费料,使工艺过程复杂化,而且在渗碳或碳氮共渗之后不能进行直接淬火。镀铜曾被广泛应用过,但工艺烦琐,成本较高;碱性镀铜还有废液不易处理的问题。因此,目前在 I. INTRODUCTION Many carburizing parts (or carbonitriding parts) often have parts that are not carburized (or carbonitriding). In the past, the method used was to cut carburized layer or copper to achieve this purpose. Although the method of cutting carbon is reliable, it takes a lot of work and costs to make the process complicated and can not be directly quenched after carburizing or carbonitriding. Copper has been widely used, but the process cumbersome, higher cost; alkaline copper plating and waste is not easy to deal with the problem. So at the moment