采用脉冲电沉积法制备纳米晶镍镀层,利用扫描电镜、透射电镜及XRD对不同糖精钠浓度下制得的镍镀层的微观结构进行了表征,采用显微硬度计、DSC及全电位测试仪对镀层的硬度、热稳定性和耐蚀性进行研究.结果表明:镍镀层晶粒尺寸随着糖精钠浓度升高先增后降,浓度为10 g/L时晶粒尺寸最小;当浓度低于15 g/L时,镀层表面较为光滑、明亮;镍镀层的显微硬度在糖精钠浓度为10 g/L时达到最大值,显微硬度与平均晶粒尺寸的关系基本符合Hall-Petch方程;镍层晶粒的失稳长大温度随糖精钠浓度的增加在305℃上下波动;当糖精钠浓度为10 g/L时,镍层的耐蚀性最好.
Nanocrystalline nickel (nc-Ni) coatings were prepared by pulse electrodeposition method.Their microstructure was investigated by SEM,TEM and XRD,and their microhardness,thermal stability and corrosion resistance were studied by a microhardness tester,DSC size of nc-Ni coating decreases firstly,and then increases,while the smallest grain size is achieved at 10 g/L.With the saccharin concentration less than 15 g/L in electrolyte,the surface of the electrodeposit is smooth and bright.The microhardness of nc-Ni coatings for the Hall-Petch function approximately.The instability growth temperature of nc-Ni coatings is slightly fluctuated at 305 ℃ under is 10 g/L.
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