Influence of SiO2 Particles on Microstructures and Properties of Ni-W-P-CeO2-SiO2 Nano-Composite Coatings
来源期刊：JOURNAL OF RARE EARTHS2007年增刊第1期
论文作者：Wang Junli Guo Zhongcheng Wang Hua Xu Ruidong
Key words：pulse electrodepositon; nano-composite coatings; deposition rate; microhardness; microstructure; rare earths;
Abstract: Ni-W-P-CeO2-SiO2 nano-composite coatings were prepared on the carbon steel surface by pulse co-deposition of nickel, tungsten, phosphorus, nano-CeO2 and nano-SiO2 particles. The influence of nano-SiO2 particles concentrations in electrolyte on microstructures and properties of the nano-composite coatings were researched, and the characteristics were assessed by chemical compositions, element distribution, deposition rate, microhardness and microstructures. The results indicate that when nano-SiO2 particles concentrations in electrolyte are controlled at 20g·L-1, the deposition rate with 27.07μm·h-1 and the microhardness with 666 Hv of the nano-composite coatings are highest, element line scanning and area scanning analyses show that the average contents of elements W, P, Si and Ce in the nano-composite coatings are close. displaying that the distribution of every element within the nano-composite coatings is even. An increase in nano-SiO2 particles concentrations in electrolyte (when lower than 20g·L-1) leads to refinement in grain structure of nano-composite coatings, but when it improved to 30g·L-1, the crystallite sizes increase again and in the meantime there are a lot of small boss with nodulation shape appearing on the surface of nano-composite coatings.
Wang Junli1，Guo Zhongcheng2，Wang Hua2，Xu Ruidong2
(1.Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, China;
2.Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China)
Abstract:Ni-W-P-CeO2-SiO2 nano-composite coatings were prepared on the carbon steel surface by pulse co-deposition of nickel, tungsten, phosphorus, nano-CeO2 and nano-SiO2 particles. The influence of nano-SiO2 particles concentrations in electrolyte on microstructures and properties of the nano-composite coatings were researched, and the characteristics were assessed by chemical compositions, element distribution, deposition rate, microhardness and microstructures. The results indicate that when nano-SiO2 particles concentrations in electrolyte are controlled at 20g·L-1, the deposition rate with 27.07μm·h-1 and the microhardness with 666 Hv of the nano-composite coatings are highest, element line scanning and area scanning analyses show that the average contents of elements W, P, Si and Ce in the nano-composite coatings are close. displaying that the distribution of every element within the nano-composite coatings is even. An increase in nano-SiO2 particles concentrations in electrolyte (when lower than 20g·L-1) leads to refinement in grain structure of nano-composite coatings, but when it improved to 30g·L-1, the crystallite sizes increase again and in the meantime there are a lot of small boss with nodulation shape appearing on the surface of nano-composite coatings.
Key words:pulse electrodepositon; nano-composite coatings; deposition rate; microhardness; microstructure; rare earths;
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