Evolution of hydrogen dissolved in molten aluminum during solidification can lead to porosity in the resulting castings. Thus, the quality of castings can be improved by controlling the amount of hydrogen in molten aluminum through various degassing processes, the effectiveness of which can be improved with real-time information on the amount of hydrogen in the alloy. In response to this need, various methods for determining the hydrogen content in molten aluminum have been developed. The hydrogen sensor described in this work is based on a proton-conducting electrolyte (indium-doped calcium zirconate) with a condensed-phase reference electrode.
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