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| CORROSION BEHAVIOR OF THE Ni-SiC NANOCOMPOSITE COATINGS |
| WANG Ping1, CHENG Yingliang1, ZHANG Zhao2 |
1. College of Materials Science and Engineering, Hunan University, Changsha 410082
2. Department of Chemistry, Yuquan Campus, Zhejiang University, Hangzhou 310027 |
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Abstract Ni-SiC nanocomposite coatings were prepared by means of the conventional electrocodeposition method. The technological parameters that make the nanocomposite coatings have a better corrosion resistance in 0.5 mol/L NaCl solution were preliminarily determined by using electrochemical impedance spectroscopy test（EIS）. By comparing the charge transfer resistance of the coatings, it is shown that coatings prepared with current density range of 15 mA/cm2~20 mA/cm2 and SiC content of 6 g/L have better corrosion resistance. The structure of coatings were investigated by scanning electron microscopy（SEM）. The corrosion resistance of Ni-SiC nanocomposite coatings and pure nickel coatings in 0.5 mol/L NaCl solution and 1 mol/L HNO3 solution was analyzed by immersion tests, electrochemical impedance spectroscopy and polarization curves. As immersion time prolonged in 0.5 mol/L NaCl solution, the charge transfer resistance of Ni-SiC nanocomposite coatings and pure nickel coatings reduced rapidly at initial stage and then became stable at later stage. Moreover, the charge transfer resistance of Ni-SiC nanocomposite coatings were higher than those of pure nickel coatings at the most of the immersion time. In addition, the charge transfer resistance of coatings containing SiC particles were 2 to 5 times higher than those of coatings without SiC particles when they were immersed in 1 mol/L HNO3 solution for 0.5 h. So the SiC nano-particles were helpful to improve the corrosion resistance of the coatings, which increased with increasing SiC content in the coatings. The effect of SiC nano-particles on the corrosion resistance was discussed in details.
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Received: 06 April 2010
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Corresponding Authors:
CHENG Yingliang
E-mail: deepblacksea@163.com
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