电流密度对不锈钢基β-二氧化铅-二氧化钛-四氧化三钴复合镀层性能的影响  

Effect of current density on performances of β-lead(Ⅳ) oxide-titanium(Ⅳ) oxide-cobalt(Ⅱ,Ⅲ) oxide composite coating

作　　者：石凤浜[1] 陈步明[1] 郭忠诚[1] 袁飞刚[1] 郈亚丽[1] 

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093

出　　处：《电镀与涂饰》2012年第1期5-8,共4页Electroplating & Finishing

基　　金：国家自然科学基金项目(51004056);云南省应用基础研究基金项目(2010ZC052)

摘　　要：研究了电流密度对不锈钢基β-PbO2-TiO2-Co3O4复合镀层的沉积速率、显微硬度、表面形貌、结合力、电催化活性等性能的影响。镀液组成和其他工艺条件为:Pb(NO3)2250g/L,HNO310g/L,NaF0.5g/L,TiO215g/L,Co3O430g/L,温度50℃,pH1～2,沉积时间4h。通过扫描电镜、能谱仪和X射线衍射仪分析了复合镀层的形貌、组成和构相。结果表明,最佳电流密度为4A/dm2。在4A/dm2下,β-PbO2-TiO2-Co3O4复合镀层的沉积速率为15.31g/(h·dm2),显微硬度为653.3HV,表面平整、致密。镀层中Ti、Co的摩尔分数分别为2.22%和4.37%,表明TiO2和Co3O4颗粒与β-PbO2镀层实现了共沉积。The effect of current density on deposition rate, microhardness, surface morphology, adhesion strength, and electrocatalytic activity of β-PbO2-TiO2-C0304 composite coating on stainless steel was studied. The bath composition and other process parameters are as follows： Pb（NO3）2 250 g/L, HNO3 10 g/L, NaF 0.5 g/L, TiO2 15 g/L, Co304 30 g/L, temperature 50℃, pH 1-2, and deposition time 4 h. The morphology, composition and microstructure of the composite coating were examined by scanning electron microscope, energy-disperse spectroscope, and X-ray diffractometer. The results showed that the optimal current density is 4 A/dm2. At this current density, the deposition rate is 15.31 g/（h·dm2）, and the β-PbO2-TiO2-Co3O4 composite coating obtained has a microhardness of 653.3 HV as well as a uniform and compact surface. The Ti and Co contents of the composite coating are 2.22% and 4.37% respectively, indicating that TiO2 and Co304 particles codeposit in β--PbO2 coating successfully.

关 键 词：二氧化铅 二氧化钛 四氧化三钴 复合电镀 电流密度 电催化活性 

分 类 号：TQ153.3[化学工程—电化学工业]