AluNature

Anodizing is an electrochemical operation. This means that aluminum is treated in a chemical bath by the action of an electric current. The bath usually consists of dilute sulfuric acid, often with an addition of oxalic acid. The aluminum object is thereby connected to the positive pole, the anode of the direct current source, hence the name anodizing. Oxygen develops on the workpiece surface due to the effect of the electricity on the bath. This oxygen is formed in the form of free atoms, which are very active. Because the oxygen bonds with the aluminum, an oxide layer is built up that is 400 to 500 times thicker than the natural oxide film that forms on the aluminum in the air.