Study on diffusion model and corrosion performance of nanocrystalline Fe–Ni alloy
Nanocrystalline Fe was obtained from the surface of low carbon steel by shot peening technology and nanocrystalline Fe–Ni alloy was obtained from the surface by electroplating nickel. A series of diffusion layers of nanocrystalline Fe–Ni alloy were prepared by controlling the temperature during heat treatment. The micro-morphology and interface composition was observed by scanning electron microscopy and X-ray diffraction. The nanocrystalline Fe–Ni alloy corrosion resistance was evaluated by electrochemical workstation. The results show that with the increase of shot peening time, the iron grain size decreased, the smallest grain size reached was 256 nm. According to the analysis of error function, the inter-diffusion coefficient of Fe–Ni alloy increases with increasing diffusion temperature. When heat treatment temperature reaches 923 K, the diffusion layer thickness is 18.59 μm, the diffusion coefficient of Ni in Fe is 9.36 × 10–16 m2/s. The diffusion model of nanocrystalline Fe–Ni plating layer is obtained by the Boltzmann-Matano method. It is found that the corrosion potential and the corrosion current density at a temperature of 923 K are –0.4379 V and 2.145 × 10–6 A/m2, respectively, and the corrosion resistance of the plating increases with increasing temperature.
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Document Type: Research Article
Publication date: June 1, 2018
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