用脉冲电沉积方法制备纳米晶Ni-Co-Fe-P合金镀层.采用X射线衍射(XRD),透射电镜(TEM),扫描电镜(SEM),能谱分析(EDS)等测试方法研究合金镀层的微观结构、表面形貌和合金成分；采用电化学极化曲线的方法测定合金镀层的腐蚀特性.结果表明随着P加入导致合金镀层晶粒细化,并随P含量的增加镀层从纳晶向非晶转变；纳晶Ni-40.41％Co-6.16％Fe-1.63％P合金镀层经600℃退火1h后,其平均晶粒尺寸从8.3nm长大至160.8nm.合金镀层的点蚀抗力随着镀层中P含量的增加而明显增强；合金镀层的腐蚀速率随晶粒尺寸的增大而减小,存在典型的晶粒尺寸效应.
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