Theanodising process that converts the surface of aluminium into an oxide via an electrochemical process has the dual effect of being anti-corrosive and enhancing aesthetic appeal.
Sulphuric anodising is by immersion in a bath of sulphuric acid; this is the most common type of anodising used in many sectors, such as aerospace and defence. With its capacity to absorb a wide range of pigments it is widely used in applications where appearance is of primary importance.
Phosphoric acid anodising is mainly used on surfaces to be bonded, as it forms a layer of highly porous oxide that promotes adhesion. Maximum pore diameter is obtained with a phosphoric acid electrolyte, the optimum surface condition for subsequent electrodeposition treatments.
Hard anodic oxidation is mainly used where surface hardness and resistance to wear and abrasion are required. It substantially increases surface hardness.
Hard anodising can be integrated with Teflon which significantly improves the coefficient of friction of the hard oxide and is impregnated in the hard layer without altering the thickness.
Anodic oxidation of magnesium gives objects a higher level of protection against environmental conditions, and enhances durability and resistance to corrosion and abrasion.
Hard oxidation is an electrolyte process that grows a layer of hard oxide on the surface of the aluminium to form an integral part of the substrate.