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The present invention relates to a corrosion-resistant magnesium alloy which can be prepared with a justifiable expenditure of energy from scrap or impure copper-containing recursors and displays a ductility such that it can be used as a casting or kneading material. The magnesium alloy contains, relative to the total weight of the magnesium alloy, 1 to 9 wt.-% aluminium, 0.6 to 6 wt.-% zinc, 0.I to 2 wt.-% manganese, 0 to 2 wt.-% rare earth elements, 0.5 to 2 wt.-% copper, wherein the weight ratio of aluminium to zinc lies in the range from i : i to 2 : 1.