Influence of La on Microstructure and Electrolysis Performance of Cu-Ni-Fe-Al Alloy by Investment Casting
In order to solve the problems of high temperature oxidation and poor corrosion resistance of the inert anode of Cu-Ni-Fe alloy during the process of aluminum electrolysis,Cu-Ni-Fe-8Al alloy was fabricated by vacuum smelt-ing method.Moreover,Cu-Ni-Fe-8Al-x La(x =0、1 and 2)alloys with different La contents were prepared,and the effect of La addition on microstructure and electrolytic corrosion performance of Cu-Ni-Fe-8Al alloy were investi-gated.The results indicate that aluminate is formed during the process of high temperature electrolysis after Al addion,inhibiting the external diffusion of Cu.The addition of rare earth La enhances the associativity between oxide film and matrix,further reducing the corrosion loss of anode material,while excessive addition of La can accelerate the corro-sion of Cu-Ni-Fe alloy to a certain degree.Therefore,Cu-Ni-Fe-8Al-La alloy with proper amount of Al and trace La is expected to be an alternative anode material for inert anode aluminum electrolysis.
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