1前言针对内孔局部复镀铬出现与原镀层成明显台阶、局部复镀交界处起泡脱落、镀层结合力差、镀层尺寸难以控制等问题，进行了分析和试验，采用在普通镀前处理条件下进行内孔局部复镀铝的方法，效果显著。2内孔局部复镀铬工艺21工艺流程内孔局部无铅件→砂抛光→尺寸检测→汽油? 1 Preface In view of the internal hole of the partial chromate plating and the original coating into a significant step, the local complex plating at the junction of blister off, poor adhesion of the coating, coating size difficult to control and other issues were analyzed and tested using conventional plating pre-treatment conditions Under the hole partial plating aluminum method, the effect is significant. 2 Inner hole partial chromate plating process 21 process hole local lead-free parts → sand polishing → size detection → gasoline?