Influence of microstructure on the corrosion resistance of Fe–44Ni thin films |
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作者姓名: | Lin Lu Tian-cheng Liu Xiao-gang Li |
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作者单位: | Corrosion and Protection Center, University of Science and Technology Beijing, Beijing, 100083, China |
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基金项目: | This work was financially supported by the Major State Basic Research Development Program of China(2014CB643300),the National Natural Science Foundation of China(U1560104),the National Environmental Corrosion Platform |
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摘 要: | An Fe–44Ni nanocrystalline (NC) alloy thin film was prepared through electrodeposition. The relation between the microstructure and corrosion behavior of the NC film was investigated using electrochemical methods and chemical analysis approaches. The results show that the NC film is composed of a face-centered cubic phase (γ-(Fe,Ni)) and a body-centered cubic phase (α-(Fe,Ni)) when it is annealed at temperatures less than 400℃. The corrosion resistance increases with the increase in grain size, and the corresponding corrosion process is controlled by oxygen reduction. The NC films annealed at 500℃ and 600℃ do not exhibit the same pattern, although their grain sizes are considerably large. This result is attributed to the existence of an anodic phase, Fe0.947Ni0.054, in these films. Under this condition, the related corrosion process is synthetically controlled by anodic dissolution and depolarization.
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关 键 词: | iron nickel alloys nanocrystalline alloys thin films phase composition corrosion resistance annealing temperature grain size |
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