Aluminium: the most abundant metal in the Earth’s crust.
Aluminium makes up around 8% of the Earth’s crust by weight. As it reacts easily
with oxygen, it isn’t found in its metallic state apart from in certain places with
no oxygen such as volcanic mud. It is non-magnetic and non-sparking and has a high
resistance to corrosion due to the forming of a powdery surface layer of aluminium
oxide. Aluminium plant containers are lacquered to prevent oxidisation and although
resistant to further corrosion, the powdery surface coating is not an attractive
finish for outdoor plant containers and is not
normally recommended. The lacquer prevents oxidisation for some time when used outdoors
but is not durable enough for long term use. Although very abundant, the extraction
process for aluminium is not as simple as it is for iron and is done by electrolysis.
The aluminium drink can is the most recycled container in the world. Around 63% of
all such cans are recycled. Aluminium is 100% recyclable and the recycling uses
only 5% of the energy required to produce aluminium from ore.
Some types of aluminium plant containers available: