Journal
CORROSION SCIENCE
Volume 156, Issue -, Pages 32-43Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.05.012
Keywords
Fe-Ni alloy; Aluminum electrolysis; Inert anode; Passivation
Funding
- National Key R&D Program of China [2017YFC0805100]
- National Natural Science Foundation of China [51574071]
- Fundamental Research Funds for the Central Universities [N172502003]
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The corrosion behavior of Fe-Ni alloys in molten 45KF-50AlF(3)-5Al(2)O(3) (wt.%) at 700 degrees C was characterized in this study. After oxygen evolution, all of the Fe-Ni alloys formed a passivation film consisting of an outer Fe2O3 layer, an intermediate Fe3O4 layer, and an inner FeO layer. Because of the outward diffusions of nickel ions, a NiO layer formed in the passivation film when the 43Fe-57Ni alloy was passivated by O-2. A solid-state reaction between Fe2O3 and NiO led to the formation of NiFe2O4 in the passivation film, which greatly promoted its corrosion resistance to the molten fluoride salts.
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