Aluminum Calcium Alloy

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A highly ductile, tin-like metal, aluminum calcium alloy has excellent corrosion resistance and is ideally suited for the production of high-performance, lightweight construction materials. It is also a very good raw material for the manufacture of deep cycle batteries.

Calcium, Ca, is one of the alkaline-earth metals and the fifth most abundant element on Earth, although it does not occur free in nature. It is the lightest of all metals and has a low melting point. It does not readily oxidize in dry air at room temperature, but it is very reactive with water owing to the exothermic liberation of hydrogen. It reacts with most halogens and forms numerous compounds, such as fluoride and hydroxide.

The present invention is directed to an aluminum-magnesium-scandium-calcium alloy with a high magnesium content of between 1 and 5 wgt.-% and a density of less than 2.6 g/cm3. It is characterized in that the calcium 14 contained in the alloy preferably comprises at least 1.0 wgt.-%, more preferably 2.5 wgt.-%, and still more preferably 6.0 wgt.-% of the total mass of the alloy.

In the present invention, the aforementioned alloy is produced by adding calcium in a very controlled manner to molten aluminum in an atmosphere which does not contain oxygen. This prevents the formation of calcium oxide which otherwise would reduce the alloy’s ductility and corrosion resistance. In this way, the alloy has a much better overall performance than is the case for established, industrially used aluminum-magnesium-scandium alloys having a magnesium content of under 6 wgt.-%, which are characterized by their very limited solubility for calcium 14.