Structural characterization and corrosive property of Ni-P/CeO2 composite coating
来源期刊：Journal of Rare Earths2009年第1期
论文作者：靳惠明 姜世杭 张林楠
文章页码：109 - 113
摘 要：Electroless Ni-P/nano-CeO2 composite coating was prepared in acidic condition, and its microstructure and corrosive property were compared with its CeO2-free counterpart.Scanning electronic microscopy（SEM）, transmission electronic microscopy（TEM）, X-ray diffraction spectrometer（XRD）, and differential scanning calorimeter（DSC） were used to examine surface morphology and microstructure of the coating.Corrosive investigation was carried out in 3%NaCl+5%H2SO4 solution.The results showed that Ni-P coating had partial amorphous structure mixed with nanocrystals, whereas the Ni-P/CeO2 coating had perfect amorphous structure.In high temperature condition, Ni3P precipitation and Ni crystallization occurred in both coatings but at different temperatures, whereas the Ni-P/CeO2 coating had sintered phase of NiCe2O4 spinels.The anticorrosion property and passivity were improved in the CeO2-containing coating due to its less liability to undergo local-cell corrosion than its CeO2-free counterpart.During the co-deposition process, some Cen+（n=3, 4） ions may be adsorbed to the metal/solution interface, hinder nickel’s crystal-typed deposition and promote phosphorous deposition.The nano-CeO2 doping finally resulted in the coating’ perfect amorphous structure and good anti-corrosive property.
靳惠明1，姜世杭1，张林楠2
1. College of Mechanical Engineering, Yangzhou University2. College of Environmental Science and Engineering, Peking University
摘 要：Electroless Ni-P/nano-CeO2 composite coating was prepared in acidic condition, and its microstructure and corrosive property were compared with its CeO2-free counterpart.Scanning electronic microscopy（SEM）, transmission electronic microscopy（TEM）, X-ray diffraction spectrometer（XRD）, and differential scanning calorimeter（DSC） were used to examine surface morphology and microstructure of the coating.Corrosive investigation was carried out in 3%NaCl+5%H2SO4 solution.The results showed that Ni-P coating had partial amorphous structure mixed with nanocrystals, whereas the Ni-P/CeO2 coating had perfect amorphous structure.In high temperature condition, Ni3P precipitation and Ni crystallization occurred in both coatings but at different temperatures, whereas the Ni-P/CeO2 coating had sintered phase of NiCe2O4 spinels.The anticorrosion property and passivity were improved in the CeO2-containing coating due to its less liability to undergo local-cell corrosion than its CeO2-free counterpart.During the co-deposition process, some Cen+（n=3, 4） ions may be adsorbed to the metal/solution interface, hinder nickel’s crystal-typed deposition and promote phosphorous deposition.The nano-CeO2 doping finally resulted in the coating’ perfect amorphous structure and good anti-corrosive property.
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