Refining of degasifying and removing of non-metallic impurities during aluminium alloy production

Abstract

In melting  aluminum and aluminum alloy, molten aluminum reacts readily with oxygen, cacbon monoxide and cacbon dioxide; it also reacts with adsorbed water, water present in hydrated oxide films on metal charges, water vapor in the atmosphere of the furnace to form oxides and hydrogen. As a result, a higher level of hydrogen is retained in the metal. In solid aluminum, hydrogen in excess of the solution limit can precipitate as H₂ at grain boundaries. Thus, refining and degasifying can be improved mechanical properties of material.