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| Microstructure and corrosion behavior of electroless deposited Ni-P/CeO2 coating |
| Hui Ming Jina, Shi Hang Jianga, Lin Nan Zhangb |
a College of Mechanical Engineering, Yangzhou University, Yangzhou 225009, China;
b College of Environmental Science and Engineering, Peking University, Beijing 100015, China |
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Abstract 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) and X-ray diffraction (XRD) spectrometer were used to examine surface morphology and structure of the as-plated coating.Differential scanning calorimeter (DSC) and transmission electronic microscopy (TEM) were used to study the coating's phase change at high temperature.The coating's corrosive behavior in 3%NaCI+5%H2SO4 solution was also investigated.The results showed that Ni-P coating had partial amorphous structure mixed with nano-crystals,while the Ni-P/CeO2 coating had perfect amorphous structure.In high-temperature condition,Ni3P precipitation and Ni crystallization took place in both coatings but at different temperatures,while the Ni-P/CeO2 coating had sintered phase of NiCe2O4 spinels.The anti-corrosion property was better in the CeO2-containing coating,and this was due to its less liability to undergo local-cell corrosion than its CeO2-free counterpart.Ni-P/CeO2 coating's pure amorphous structure was the result of Ni's hindered crystal-typed deposition and P's promoted deposition.
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Received: 15 April 2008
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| Fund:This work was supported by National Natural Science Foundation of China (No. 29233011) and Natural Science Foundation of Jiangsu Province (No. 07KJD430246). |
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Corresponding Authors:
Hui Ming Jin,E-mail address:doctorjhm@sohu.com
E-mail: doctorjhm@sohu.com
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