Probe into deposition mechanism of double pulse electrodepositing Ni-W-P matrix composite coatings containing CeO_2 and SiO_2 nano-particles  

作　　者：王军丽 章俞之 徐瑞东 詹鹏 

机构地区：[1]Research Center for Analysis and Measurement,Kunming University of Science and Technology [2]Key Laboratory of Inorganic Coating Materials,Chinese Academy of Sciences [3]Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology

出　　处：《Journal of Rare Earths》2010年第S1期437-441,共5页稀土学报（英文版）

基　　金：Projects supported by the National Natural Science Foundation of China (20806035);Back-up Personnel Foundation of Academic and Technology Leaders of Yunnan Province (2009CI026);Opening Project of Key Laboratory of Inorganic Coating Materials,Chinese Academy of Sciences (KKZ6200927001);Applied Basic Research Plans Program of Yunnan Province (2007E187M);Scientific Research Fund of Yunnan Provincial Education Department (08C0025);Training Foundation for Talents and Analysis and Measurement Foundation of KMUST

摘　　要：Ni-W-P matrix composite coatings reinforced by CeO2 and SiO2 nano-particles were prepared on common carbon steel surface by double pulse electrodeposition and the deposition mechanism was discussed.The results showed that the composite coatings with amorphous structure were obtained as-deposited.The initial growth behavior had alternatives and the nucleation was inhomogeneous because of obvious composition fluctuation.With the pulse deposition time increasing,some pearlite microstructures of the substrate were covered by some deposits and the composition fluctuation disappeared.Forward pulse currents promoted to form a great number of atomic beams composed of Ni,W and P atoms or CeO2 and SiO2 nano-particles as the core,which inhabited the growth of atomic beams.Reverse pulse currents eliminated concentration polarization and dissolved some surface boss of atomic beams.The solution of W and P atoms within Ni grains and embedding of CeO2 and SiO2 nano-particles within Ni-W-P matrix metal made atomic arrangement disordered.Finally,the atomic beams grew to amorphous small particles.Ni-W-P matrix composite coatings reinforced by CeO2 and SiO2 nano-particles were prepared on common carbon steel surface by double pulse electrodeposition and the deposition mechanism was discussed.The results showed that the composite coatings with amorphous structure were obtained as-deposited.The initial growth behavior had alternatives and the nucleation was inhomogeneous because of obvious composition fluctuation.With the pulse deposition time increasing,some pearlite microstructures of the substrate were covered by some deposits and the composition fluctuation disappeared.Forward pulse currents promoted to form a great number of atomic beams composed of Ni,W and P atoms or CeO2 and SiO2 nano-particles as the core,which inhabited the growth of atomic beams.Reverse pulse currents eliminated concentration polarization and dissolved some surface boss of atomic beams.The solution of W and P atoms within Ni grains and embedding of CeO2 and SiO2 nano-particles within Ni-W-P matrix metal made atomic arrangement disordered.Finally,the atomic beams grew to amorphous small particles.

关 键 词：double pulse electrodeposition metal matrix composite coatings NANO-PARTICLES deposition mechanism rare earths 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TG174.4[金属学及工艺—金属表面处理]