环保型纳米晶镀锌层／电泳漆复合镀层  

Environmental Friendly Composite Coating with Electroplated Nanocrystalline Zinc and Electrophoretic Paint

作　　者：苏永其 张振杰[1] 汪红[1] 姚锦元[1] 蒋为桥[1] 丁桂甫[1] 

机构地区：[1]微米/纳米加工技术国家重点实验室,薄膜与微细技术教育部重点实验室,上海交通大学微纳科学技术研究院,上海200240

出　　处：《腐蚀与防护》2011年第6期463-466,469,共5页Corrosion & Protection

基　　金：上海市科委科研计划项目(0852nm02600)

摘　　要：为了实现汽车零部件环境友好型镀锌防腐蚀处理,利用纳米镀锌和电泳涂装技术的有机结合,分别对酸性和碱性镀液电镀锌进行纳米改性研究。采用金相显微镜和场发射扫描电子显微镜(FE-SEM)研究镀锌层的表面形貌以及复合镀层的断面形貌;测量了镀锌层的塔菲尔(Tafel)曲线;采用百格刀法测试层间结合力并对复合镀层进行中性盐雾试验。结果表明,两种镀锌层均出现纳米晶;随着镀锌电流密度的增大两种镀锌层的腐蚀电位均增大,同时腐蚀电流密度降低;复合镀层中性盐雾试验耐腐蚀时间达到1000 h且结合力达到5B水平,这表明纳米晶镀锌层和电泳漆层具有良好的结合力和耐腐蚀性能。Combination of electroplated nanocrystalline （NC） zinc and electrophoretic coating technology was used to realize the environmentally friendly electrogalvanizing of auto parts. Nano-modification research was carried out in acidic solutions and alkaline solutions respectively. The grain size and surface morphology of etectroplated NC zinc were examined by field emission scanning electron microscopy （FE-SEM）. The fracture surface micrograph of composite coating was investigated by optical microscopy. Tafel curves of electroplated NC zinc in two solutions were obtained. The adhesion was tested by means of cross-cut test and neutral salt spray test was carried out on composite coating. The results showed that NC zinc was obtained in electrogalvanizing in two solutions. The corrosion current density of electroplated zinc coating decreased while the corrosion potential shifted to more positive with the increase of the current density. The time of neutral salt spray test achieved 1000 hours and the adhesion reached 5B level, which demonstrated that electroplated NC zinc bonded well with electrophoretic paint and the composite coating had excellent corrosion resisitance.

关 键 词：纳米锌 电泳涂装 耐蚀性 复合镀层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]