Anodic sulphuric oxidation

Anodic sulphuric oxidation (ASO) is the controlled oxidation of the substrate in an acidic medium, usually oxidation of the substrate in an acidic medium, usually in a sulphuric acid bath. acid bath. Depending on the properties required, anodising may be followed by a sealing operation. The purpose of this operation is to seal the porous porous anodised layer by immersing the oxidised parts in boiling water to hydrate the layer. The anhydrous alumina is then transformed into alumina alumina monohydrate and this transformation is accompanied by an increase in volume which closes the pores. The thickness of the oxide film obtained depends on the chemical composition of the alloy and The thickness of the oxide film obtained depends on the chemical composition of the alloy and varies according to the application and the industrial sector concerned. The treatment leads to a swelling equivalent to 33% of the film thickness and a slight and a slight increase in roughness. The oxide layer mainly consists of a porous structure. Processes used: - Attachment coatings for small to large series.