Cl2, N2 and H2 gas are blown into molten Al for degasification. Effects to degasification is affected in order to H2, N2, Cl2 by measurement of vacuum discharge extruction method. But most effective gas is considered to active Cl2. Inactive gas (N2, H2) are needed refining to moisture or oxygen. Some observations of degasification mechanism to inactive gas blowing method are presented.
