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Anodising, What people say

Anodising
On exposure to air, aluminium will immediately form a stable oxide layer. This natural oxide film is however, very thin, approximately 1/100th of a micron, and will provide little corrosion resistance under normal atmospheric conditions.

Anodising is the controlled formation of aluminium oxide at the surface of items made from aluminium and its alloys. The anodic coating is produced by passing an electric current through a dilute acid solution using the work as the anode. The thickness, density, hardness and colour of the coating can be varied depending on the solution and the processing conditions.

By modifying the processing conditions a wide range of properties and coatings can be achieved, making anodising an ideal surface engineering technique for a wide range of applications.

Anodizing, or anodising, is a technique used to coat the surface of a metal with an oxide layer. It may be used to increase corrosion resistance, increase wear resistance, allow dyeing or prepare the surface for other processes and coatings including paint. Anodization changes the microscopic texture of the surface and can change the crystal structure of the metal near the surface. The process derives its name from the fact that the part to be treated forms the anode portion of an electrical circuit in this electrolytic process.

Anodization is frequently used to protect aluminium and titanium from abrasion and corrosion and to allow it to be dyed in a wide range of colours

 

Anodising is the name for the treatment of aluminium to produce natural oxide coatings for protection, identification, wear resistance and decoration.

Aluminium components are anodised by placing them in a solution; a voltage is applied causing an oxide film to be produced at a controlled rate to a desired thickness. This anodic film is not a surface coating, but is part of the material.


Standard Sulphuric Anodising provides a silver coloured finish showing the natural colour of the metal but components can also be dyed in a range of colours to provide eye-catching effects. Colours may be Red, Blue, Black, Gold, Violet or Silver.

 

Sulphuric Acid Anodising
The most common form of anodising is sulphuric acid anodising.
An anodic film thickness of up to 30microns can be produced, depending on the grade of alloy and end use of the components. The lower range of thickness is ideal for decorative finishes, and the medium range is ideal for dyeing.
Anodic films with a thickness above 15microns are used for increased durability and external applications, where corrosion resistance and wear are the main criteria.
Etching, and or polishing prior to anodising may be carried out to enhance the component's appearance. The oxide film produced provides the surface of the aluminium with an extremely hard, durable, corrosion resistant and long lasting finish.
Sulphuric Acid Anodising provides a cost-effective way to enhance the performance and appearance of Aluminium.
Before you begin the manufacturing process of your aluminium components you might like to consider the grades of material available. We would be able to offer some advice regarding the material choice, its use and suitability for the type of finish you might require.

 

 

 

 

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