脉冲电沉积纳米SiC/Ni-Co复合镀层腐蚀特性  

Corrosion characteristic of pulsed electrodeposition nano SiC/Ni-Co composite coating

作　　者：钟远辉[1] 戴品强[1] 周翔[1] 

机构地区：[1]福州大学材料科学与工程学院,福州350108

出　　处：《复合材料学报》2009年第4期111-118,共8页Acta Materiae Compositae Sinica

基　　金：福建省科技计划重点项目(2006H0020)

摘　　要：采用X射线衍射(XRD)、扫描电镜(SEM)、能谱分析(EDS)研究了脉冲电沉积法制备的纳米晶Ni-Co合金镀层及其纳米SiC/Ni-Co复合镀层的组织结构、表面形貌和成分。用浸泡法和电化学极化法对比测试了纳米晶Ni-Co合金镀层和纳米SiC/Ni-Co复合镀层在3.5 wt%NaCl和5 wt%HCl溶液中的腐蚀行为。研究结果表明:通过脉冲电沉积法制备的Ni-Co合金镀层和纳米SiC/Ni-Co复合镀层具有典型的纳米晶结构;随着纳米SiC颗粒的增加,复合镀层的晶粒尺寸减小,硬度增加。所制备的纳米SiC/Ni-Co复合镀层颗粒分散均匀,其在3.5 wt%NaCl和5 wt%HCl溶液中的耐蚀性均优于纳米晶Ni-Co合金镀层。纳米晶Ni-Co合金镀层和纳米SiC/Ni-Co复合镀层在3.5 wt%NaCl溶液中的腐蚀速率极低,表现出极好的耐腐蚀性能,而在5 wt%HCl溶液中的腐蚀形态则表现为点蚀。The microstructures, surface morphology and composition of nanocrystalline Ni -Co alloy and nano SiC/ Ni- Co composite coating prepared by pulse electrodeposition were studied by XRD, SEM and EDS. The corrosion characteristics of nanocrystalline Ni - Co alloy and nano SiC/Ni - Co composite coating were comparatively tested by the soak method and the electrochemical polarization method, respectively. The experimental results indicate that typical nanocrystalline Ni - Co alloy and nano SiC/Ni - Co composite coatings can be synthesized by pulse eleetrodeposition, and with the increasing of the nano SiC particles, the grain size of nano SiC/Ni -Co composite coating is diminished while the microhardness is increased. The nano SiC/Ni - Co composite coating has better dispersion and it exhibits better corrosion resistance in 3.5 wt%NaCl and 5 wt%HCl solution than the nanocrystalline Ni - Co alloy. The surface morphology of all samples after corrosion in 3.5 wt% NaCl solution shows good corrosion resistance, while the samples show spot corrosion in 5 wt% HCl solution.

关 键 词：脉冲电沉积 SiC/Ni-Co 复合镀层 腐蚀 

分 类 号：TG172.5[金属学及工艺—金属表面处理]