周期换向脉冲法快速电沉积Al_2O_3/Ni复合镀层

Periodic Reversal Pulse Fast Electrodeposition of Al_2O_3/ Ni Composite Coatings

以Al2O3微粒为分散相,进行了周期换向脉冲复合电沉积工艺研究,快速电沉积出了Al2O3/Ni复合镀层。利用扫描电镜及能谱分析技术对Al2O3/Ni复合镀层的微观形貌及组成进行了表征,考察了脉冲参数对复合镀层中Al2O3含量及镀层微观形貌的影响;并就周期换向脉冲电沉积与直流电沉积复合镀层的微观形貌、镀层应力及沉积速率进行比较。结果表明:采用周期换向脉冲法快速电沉积可以得到组织致密、内应力小、沉积速率高的Al2O3/Ni复合镀层。

Based on Al2O3 particles as dispersed phase,the Al2O3/ Ni composite coating was prepared by the method of periodic reversal pulse fast electrode position. The micro morphology and the composition of Al2O3/ Ni composite coating were characterized by using scanning electron microscope（ SEM） and energy dispersive spectrometer（ EDS）. The effect of the pulse parameters on the Al2O3 content in the composite coating and coating’s micro morphology ware investigated. Also the comparison between the micro morphology,coating’s stress and deposition rate of the composite coating deposited by periodic reversal pulse electrode position and direct current electrode position was undertaken. The results show that the Al2O3/ Ni composite coating with fine grains,low inner stress and high deposition rate was obtained by periodic reversal pulse electrode position.