Aluminium alloys for making downspouts are usually selected from the following alloys to meet the requirements of durability, corrosion resistance and machinability:
1. 3000 series aluminium alloy
Alloy composition: mainly contains manganese.
Characteristics: Good corrosion resistance and processability, suitable for outdoor environment, strong oxidation resistance.
2. 5000 series aluminium alloy
Alloy composition: mainly contains magnesium.
Characteristics: good strength and corrosion resistance, suitable for use in marine environments and humid climates, and resistant to salt water corrosion.
3. 6000 series aluminium alloy
Alloy composition: mainly contains magnesium and silicon.
Characteristics: Good mechanical properties and corrosion resistance, easy to process and form, suitable for a variety of construction applications.
4. 7000 series aluminium alloy
Alloy composition: mainly contains zinc.
Characteristics: High strength, but usually used in applications requiring higher strength, less often used for downspouts.
Recommended Alloys
Alloys 3004 and 5052 are common choices for downspouts:
3004: Good formability and corrosion resistance, suitable for downspouts.
5052: High strength and very good corrosion resistance, suitable for use in extreme environments.
