(北京有色金属研究总院, 北京 100088)
摘 要: 对Na2WO4WO3ZnO体系熔盐镀钨工艺进行了详细研究, 得到了获得金属钨镀层的工艺条件。结果表明: 在空气气氛中, 当氧化钨的浓度为15%~30%时,于850~950 ℃能得到金属钨镀层且镀层表面平整;当其它条件都相同时, 在铜基体上获得钨镀层比钼基体上所需的温度略高一些; 扫描电镜照片显示钨镀层与钼基体之间有明显分界面, 元素线扫描结果证实镀层与钼基体间扩散层厚度仅为2.5 μm, 基本不形成扩散层; 不同电流密度下所获得的钨镀层X射线衍射表明镀层中存在织构。
关键字: Na2WO4WO3ZnO熔盐; 电镀; 钨镀层
(General Research Institute for Nonferrous Metals, Beijing 100088, P.R.China)
Abstract:The tungsten electrodeposition process in Na2WO4WO3ZnO molten salts has been approached in details. The optimized conditions for tungsten coatings have been obtained. When the concentration of WO3 ranges between 15% and 30%(mole fraction) a plain tungsten coating can be achieved in an open air condition at 850~950 ℃.The temperature for tungsten coating on copper substrate is higher than that on molybdenum. SEM shows that there is a distinct interface between tungsten coating and substrate. ELS(element linear sweep) indicates that there is a very thin diffusion layer between tungsten coating and molybdenum substrate. Xray diffraction displays that there are textures in the tungsten coatings.
Key words: Na2WO4WO3ZnO molten salts; electrodeposition; tungsten coating