Influence of elemental iron on hydrogen content in superheated aluminum-iron melts

Abstract

The hydrogen content in liquid binary aluminum alloys with 1, 3, 5and 8wt% iron has been determined in the temperature range from 973K to 1103K. The hydrogen content in molten Al-Fe alloys increases remarkably when the temperature of the melt rises to about 1053K. This work indicates that the alloying element iron plays an important role in hydrogen content in superheated Al-Fe alloy melts below about 1053K. The results make it clear that the hydrogen content in the melt aluminum reduces with the increasing element levels. A conclusion is drawn that the degree of gassing in molten Al-Fe alloys is bound up with the properties of oxide film of aluminum alloy melts. The element iron has no effect on the compact structure of oxide film in aluminum melts. The effects of alloying element are theoretically analyzed in terms of Wagner interaction parameter. According to the values of the first order interaction parameter, it is concluded that the interaction between iron atom and aluminum is much stronger than that between hydrogen atom and aluminum, and the addition of the alloying element decreases the affinity of liquid aluminum for hydrogen.

Keywords

aluminum-iron alloy / hydrogen / interaction parameter / oxide film

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