A self‐repairing cermet anode: Preparation and corrosion behavior of (Cu–Ni–Fe)/NiFe 2 O 4 cermet with synergistic action

Abstract In this paper, the cermet (Cu–Ni–Fe)/(NiFe 2 O 4 –10NiO) anodes were prepared through the powder metallurgy method, followed by being evaluated in the bench scale (200 A) electrolysis tests for more than 1000 hour. The results showed that the as‐prepared anodes exhibited excellent corrosion resistance with corrosion rate less than 0.99 cm/a, which satisfied the requirements of the aluminum industry. The analysis results were confirmed by SEM , EDS , and XRD . The results showed that the outstanding corrosion resistance of the anodes relied on a continuous and dense NiFe 2 O 4 film formed on the surface of the anode material, which protected the inner structure of anode material during electrolysis. Finally, a model based on the synergistic action between the metal phase and the ceramic phase was built to illustrate the forming mechanism of the NiFe 2 O 4 passivating film.