Citation: Hui Ming Jin, Shi Hang Jiang, Lin Nan Zhang. Microstructure and corrosion behavior of electroless deposited Ni-P/CeO₂ coating[J]. Chinese Chemical Letters, ;2008, 19(11): 1367-1370. doi: 10.1016/j.cclet.2008.06.040 shu

Microstructure and corrosion behavior of electroless deposited Ni-P/CeO₂ coating

a College of Mechanical Engineering, Yangzhou University, Yangzhou 225009, China;
b College of Environmental Science and Engineering, Peking University, Beijing 100015, China

Received Date: 15 April 2008

Fund Project: This work was supported by National Natural Science Foundation of China (No. 29233011) and Natural Science Foundation of Jiangsu Province (No. 07KJD430246).

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/CeO₂coating 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.
- Ni-P,
- Ceria,
- Electroless deposition,
- Corrosion
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