Study on Dynamic Melting-Loss Behavior of 8407 Steel with Surface Aluminization and Oxidation Treatment

Abstract

The aluminized 8407 steel was room temperature hard anodized for 60 min at sulfosalicylic acid concentration of 50 g/L, and current density of 2.5 A/dm2. Cross section microstructure of the oxide film and the combination status between the film and the substrate were observed with metallographic microscope. Surface morphology of the film was observed by SEM. Phase composition of the film was examined with XRD. The melting-loss properties of specimens with aluminization and oxidation treatment and without treatment in liquid aluminum alloy of ADC12 under rotation condition were evaluated by weight loss method. Sample surface conditions were observed by digital camera and microstructures of sample cross sections were observed by metallographic microscope after melting-loss test. Finally, the anti-melting-loss mechanism of oxide film under dynamic condition was clarified. The results show that the formed Fe3O4·Al2O3film can improve dynamic melting-loss resistance due to isolating steel substrate from liquid aluminum.