电沉积Ni-P合金初期沉积行为的研究

STUDY ON THE INITIAL ELECTRO-DEPOSITION BEHAVIOR OF Ni-P ALLOY

对Ni-P合金在 4 5钢基体表面的初期沉积行为进行了观察与分析 ,发现电沉积Ni-P合金镀层的初期沉积行为受到基体材料组织的影响 .在退火态 4 5钢表面 ,Ni-P合金镀层优先在晶界及渗碳体表面形核 .由于珠光体组织中含有渗碳体相且具有比较高的晶界密度 ,因而在沉积初期镀层优先形核和生长 .镀层在基体表面是以纳米尺度的晶粒聚集在一起形成的多晶体形式存在的 .随着施镀时间的延长 ,纳米晶多晶体在侧向二维生长的同时 。

In this paper,study on the initial electro-deposition behavior of Ni-P alloy on the surface of 45 steel shows that it is influenced by the microstructure of matrix material.As the pearlite in it contains cementite phase and has high crystal boundary density,the nucleation and growth of deposits prefer to occur at the pearlite at the beginning during deposition on the surface of annealed 45 steel.The coating exists in form of nano-polycrystal layers composed by gathering of nano-sized crystals.With plating time going on,the nano-polycrystal gathering grows in two dimensions,and the new nano-polycrystal layer appears simultaneously on the formerly formed nano-polycrystal surface.