Preparation of Co-Ni-Ce coatings by double-pulse co-deposition on copper crystallizer surfaces
To enhance the protective capabilities of copper crystallisers and prolong their lifespan,this study focuses on the preparation of Co-Ni-Ce protective coatings through co-deposition using a double pulse tech-nique in a sulfamic acid system.The research investigates the impact of various process parameters,such as the Co(SO3NH2)2·4H2O mass concentration,pulse current density,electrical signal control,and the CeCl3·7H2O mass concentration,on the hardness of the coatings.The findings indicate that the optimal process pa-rameters include a Co(SO3NH2)2·4H2O mass concentration of 33.3 g/L,pulse current density of 4 A/dm2,du-ty cycle of 40%,pulse frequency of 20 kHz,and CeCl3·7H2O mass concentration of 2 g/L.These parameters resulted in a hardness of 559.01 HV,with the Co-Ni-Ce plating layer exhibiting a dense morphology and uni-form grain distribution.Furthermore,the addition of Ce led to a preferential orientation of the diffraction peaks of the alloy from(111)to(200),without the formation of any metallic monolithic phase.
NETL
NSTL
万方数据
