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Citation: SHI Shu-Yun, MA Wen-Ying, CHANG Li-Mina, CHEN Dan, WANG Li-Mei. Effects of Different Electro-deposition Methods on Microstructure and Corrosion Resistance of Ni-nanoAl₂O₃ Composite Coating[J]. Chinese Journal of Applied Chemistry, ;2008, 25(12): 1499-1501. shu

Effects of Different Electro-deposition Methods on Microstructure and Corrosion Resistance of Ni-nanoAl₂O₃ Composite Coating

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a College of Environmental Engineering, Jilin Normal University, Siping 136000;
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b Department of Applied Chemistry and Pharmacy, Zhuhai College, Jilin University, Zhuhai;
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c Jilin Teacher Training School, Jilin

Corresponding author: CHANG Li-Mina,
Received Date: 27 April 2008
Available Online: 10 July 2008
Fund Project: 吉林省科技发展计划项目(20000513) (20000513)

Composite coatings of Ni-nanoAl₂O₃ were obtained by direct current(DC),pulse current(PC) and pulse reverse current(PRC) electro deposition techniques.The effects of different coating methods on the structure of the composite coating were studied and the cross-section morphology and microstructure of the Ni-nano Al2O3 were analyzed by scanning electron microscopy(SEM),transmission electron microscopy(TEM),and XRD.Corrosion resistance of the coating to 3.5% NaCl solution was performed.The result showed that the prep method can significantly affect the coating microstructure and matrix grain size.The minimum size of the metal matrix Ni grains in the composition coating obtained by PRC deposition was approximately 24 nm,while the maximum grain size of Ni obtained by DC was about 38 nm.Polarization test indicated that the corrosion resistance of the composite coating Ni-nano Al2O3 deposited by PRC was the optimal one,while that by DC was the worst.The corrosion current and corrosion voltage were 2.8×10^-7 A and-0.225 V for composite coating Ni-nanoAl₂O₃ deposited by PRC,and 3.16×10^-6 A and-0.328 V for that deposited by the latter,respectively.
- pulse reverse current,
- Ni-nanoAl₂O₃ composite coating,
- corrosion resistance
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Effects of Different Electro-deposition Methods on Microstructure and Corrosion Resistance of Ni-nanoAl2O3 Composite Coating

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Effects of Different Electro-deposition Methods on Microstructure and Corrosion Resistance of Ni-nanoAl₂O₃ Composite Coating