Study on the Protection Technology Against Aluminized Surface of Anode Stub for Aluminum Electrolysis

In order to improve the protective performance of the surface of anode stub for aluminum electrolysis, an Fe-Al alloy layer was prepared on the surface of Q235B by pack aluminizing. The microstructure, high-temperature oxidation resistance, microhardness, wear resistance, and mechanical properties of aluminized layer were analyzed by scanning electron microscope, oxidation test, and abrasive wear test. The results showed that when Q235B was aluminized at 850 ℃ × 4 h, the maximum depth of aluminized layer reached 500 μm, the maximum hardness of aluminized layer reached 750 HV, and the wear resistance was 17 times than that of Q235B material. Under high temperature, a dense and uniform alumina film layer on the surface was generated in-situ, which improved the oxidation resistance of Q235B material by more than 95 times, while the tensile strength and yield strength remained unchanged after aluminizing.