摘要
利用不同占空比的脉冲电流电沉积法制备了Ni-SiCp复合镀层,结果表明,随着占空比的增大,镍基晶粒尺寸和嵌入SiC沉积含量也随之增加,当占空比为50%时复合镀层达到最大显微硬度值。采用基于电化学阻抗谱结果建立的等效电路模型模拟了不同占空比下电沉积过程的电荷传递电流。模拟结果发现,随着占空比的增大,电荷传递峰电流减小,同时模拟了复合镀层中嵌入SiC颗粒的体积分数。模拟计算结果与试验结果相似。
Ni-SiCp composite coatings are synthesized by pulse electrocodeposition with different duty cycles. The results show that the grain size and the SiC particle content increase with the increase of duty cycle, and a maximum microhardness value is obtained at a duty cycle of 50% Based on the results of electrochemical impedance spectroscopy, an equivalent circuit model is used to estimate the charge transfer current of the electrodeposition process at different duty cycles. The peak charge transfer current decreases with the increase of duty cycle. An analytical volume fraction equation is also applied to predict the content of embedded SiC particles in the composite coatings. The trend of the predictions is in consistent with the experimental results.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2010年第14期123-126,共4页
Materials Reports
基金
江西省科技支撑项目
江西省教育厅项目(GJJ09531)
景德镇市科技局项目
