镀液组成对Ni-W合金电沉积的影响

Abstract

采用电化学、分光光度、X 射线衍射和金相显微技术等方法研究nI-W 合金电沉积电流效率、沉积层的组成、结构和表面形态。结果表明，随着镀液中钨酸钠浓度提高，合金沉积层中的W 含量变化不大，沉积电流效率提高；形成置换固溶体的合金沉积层X 射线衍射（Xrd）峰强度降低，趋于矮胖，2θ向低角度偏移；引起（111）晶面间距、晶胞参数和晶格畸变的增大，而显微晶粒尺寸减小；合金沉积层的电结晶生长形态逐渐呈均匀排列的团粒状。

The effects of sodium tungstate contents on the current efficiency, composition, structure and morphology of Ni\|W alloy electrodeposit obtained in citrate bath were studied by electrochemistry, spectrophotometry, X\|ray diffraction and metallographic methods.It was shown that by the increase of sodium tungstate content in electrolyte, W content in the electrodeposit tended to a slightly change, current efficiency to raise and XRD peak intensity to decrease.The morphology of the deposit assumed even arranged granular structure.