Copper-Arsenic (CuAs) Master Alloy

Topics Covered

Chemical Composition


Master alloys are semi-finished products that control oxygen in an alloy and stabilize metals that usually oxidize in the atmosphere. These alloys are used to obtain a specific chemical specification by changing the liquid metal’s composition and also used to determine a metal’s microstructure during solidification and casting.

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Master alloys are used more frequently than pure alloys because they are more economical. Under lower temperatures master alloys dissolve faster, thus saving production time and energy.

Copper-based master alloys also include copper-zirconium, copper-iron, copper-boron and copper-manganese. In comparison with pure metals copper-based master alloys have better dissolving capacity.

The following datasheet provides an overview of copper-arsenic master alloy.

Chemical Composition

The chemical composition of copper-arsenic master alloy is outlined in the following table.

Element Content (%)
Copper, Cu 79-81
Arsenic, As 19-21


Copper-arsenic master alloys are used as dezincification inhibitor in brass and improving corrosion resistance of copper-aluminum alloys and mechanical properties of low alloyed copper alloys.

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