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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 6    December 2007

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Fabrication, lattice strain, corrosion resistance and mechanical strength of nanocrystalline nickel films
PAN Yong(潘 勇)1, 2, ZHOU Yi-chun(周益春)1, 2, ZHOU Zhao-feng(周兆锋)1, 2,HUANG Yong-li(黄勇力)1, 2, LIAO Yan-guo(廖艳果)1, 2, SUN Chang-qing(孙长庆)3

1. Faculty of Materials and Optoelectronics Physics, Xiangtan University, Xiangtan 411105, China; 2. Key Laboratory of Low Dimensional Materials and Application Technology, Ministry of Education, Xiangtan University, Xiangtan 411105, China; 3. School of Electrical and Electronic Engineering, Nanyang Technological University,Singapore 639798

Abstract:Nanocrystalline nickel films of 17−40 nm grain sizes were prepared using pulsejet electrodeposition. Structure, corrosion and lattice strain were analysed by transmission electron microscope, electrochemical workstation and X-ray diffraction, revealing that with decreasing of grain size, the lattice strain, corrosion rate of the films are enhanced. The observations can be consistently understood in terms of the bond-order-length-strength correlation mechanism indicating that the shortened and strengthened bonds between the under-coordinated atoms modify the energy density and the atomic cohesive energy in the surface skins of the grains. The surface energy density gain is responsible for the residual atomic cohesive energy for the activation energy of corrosion. Additionally, a novel algorithm was proposed to extract the elastic-plastic properties of nickel films and results that the nickel film has much higher yield strength than bulk nickel.

 

Key words: pulse jet electrodeposition; nickel film; corrosion resistance; mechanical property

ISSN 1672-7029
CN 43-1423/U

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