电刷镀镍–氧化钇纳米复合镀层的组织与耐蚀性  

Structure and corrosion resistance of nickel–yttrium oxide composite coating prepared by brush plating

作　　者：凌文丹 赵平堂 李志攀 张松奇 梁科 

机构地区：[1]鹤壁汽车工程职业学院,河南鹤壁458030 [2]河南天海电器有限公司研究院,河南鹤壁458030

出　　处：《电镀与涂饰》2014年第11期460-463,共4页Electroplating & Finishing

基　　金：河南省教育厅科研项目(13B430105)

摘　　要：采用电刷镀工艺制备了Ni—Y2O3纳米复合镀层，镀液组成和工艺条件为：NiSO4·6H2O 230～255 g／L，柠檬酸三钠90～105 g／L，乙酸铵20～30 g／L，Y2O3 15 g／L，表面活性剂 0．01g/L，pH 7．2～7．5，温度20℃，电压12V，电笔速率100～120mm／s，时间15 min。分别利用电子显微镜、X射线衍射仪和电化学工作站表征了镀层的表面形貌、微观结构和耐腐蚀性能。结果表明，与快速镍镀层相比，Ni—Y2O3纳米复合镀层更为平整、致密，晶粒相对细小。Ni—Y2O3复合镀层在3．5％NaCl溶液中的自腐蚀电位和腐蚀速率分别为-184．86 mV和0．0596 mm／a，腐蚀后表面只是局部存在轻微的凹坑，因此Ni—Y2O3复合镀层的耐腐蚀性能明显优于快速镍镀层。A Ni-Y2O3 nanocomposite coating was prepared by brush plating from the bath containing NiSO4.6H20 230-255 g/L, trisodium citrate 90-105 g/L, ammonium acetate 20-30 g/L, Y2O3 15 g/L, and surfactant 0.01 g/L at temperature 20 ℃, pH 7.2-7.5, voltage 12 V, and rate of electroprobe 100-120 mm/s for 15 min. The surface morphology, microstructure, and corrosion resistance of coating were characterized by scanning electron microscope, X-ray diffractometer, and electrochemical workstation, respectively. The results showed that Ni-Y203 nano- composite coating is smoother, more compact, and finergrained as compared with a fast nickel coating. The self- corrosion potential and corrosion rate of the Ni-Y2O3 composite coating in 3.5% NaCl solution are -184.86 V and 0.059 6 mm/a, respectively. The Ni-Y2O3 composite coating has only slight pits on its local surface after corrosion, showing much better corrosion resistance than the fast nickel coating.

关 键 词：镍 氧化钇 复合镀层 电刷镀 表面形貌 微观结构 耐腐蚀性 

分 类 号：TQ153.2[化学工程—电化学工业]