2004 Aluminium is aluminium alloy in 2xxx series, which has Copper as main alloying element and some impurity elements.
Chemical Composition
Element Weight Percentage (%)Aluminum91.7 - 94.2 %Copper5.5 - 6.5 %Iron<= 0.20 %Magnesium<= 0.50 %Manganese<= 0.10 %Other, each<= 0.05 %Other, total<= 0.15 %Silicon<= 0.20 %Titanium<= 0.05 %Zinc<= 0.10 %Zirconium0.30 - 0.50 %
References