Removal of inclusions in aluminum melt by hydrogen fluxing

The effectiveness of hydrogen fluxing on removal of inclusions in an aluminum melt has been studied. Based on the scheduled conditions, hydrogen gas was blown into the melt through an alumina tube whose tip had been filled up with porous alumina. The effect of the luxing treatment was evaluated by optical microscope observation for the electropolished surface of the sample which represents the melt. Oxide particles in the melt are removed effectively by hydrogen fluxing. While significant increase in hydrogen content of the melt is accompanied by hydrogen fluxing. Directional solidification of the melt treated with hydrogen attains both the removal of oxide and the low level of hydrogen content.