脉冲电沉积合金层较为复杂,目前尚未实际应用.采用脉冲电沉积技术制备了Ni-W-Fe-La纳米晶合金析氢镀层,利用扫描电镜、X射线衍射仪、能谱仪等设备测试了合金镀层的形貌、结构和组成.研究了制备工艺对镀层析氢性能的影响.确定了合金镀层的最佳制备工艺条件:机械搅拌下,控制平均电流密度Jm=5 A/dm2,峰值电流密度Jp=14 A/dm2,占空比R为35%,脉冲频率f=150 Hz,pH值6.0～6.5,脉冲时间30 min,镀液温度35℃.结果表明:制备的Ni-W-Fe-La镀层为纳米级镀层,其晶粒尺寸为48.73 nm;稀土La元素的加入能够明显改变镀层表面形貌、晶粒尺寸以及镀层的耐蚀和析氢电催化活性,析氢电位比直流电沉积所得的同类镀层明显正移.
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