Anodising is an electrolytic process that is used to add coatings to metal surfaces/objects. It involves highly controlled oxidation. Whilst it is most commonly used with aluminium and its alloys, anodising is a technique that can be used on a variety of other metals, such as copper, magnesium, and titanium.
What does the anodising process involve?
The anodising process involves several key stages:
1. Cleaning
The initial stage of the process is to clean the surface/object so that all contaminants – such as grease, dirt, and oils – are removed. This is usually done using specialist cleaning chemicals.
2. Pre-treatment
Pre-treatment can significantly affect the finished product. The two most popular options are bright dipping and etching. Bright dipping will result in a shiny/glossy appearance, whilst etching will create a smooth matte finish.
3. Anodising and oxidation
The object is submerged in an electrolytic bath that also contains electronic plates. The solution is then charged with a negative current via the electronic plates. Once the metal is charged, all positive ions are replaced by negative ions.
- ColouringThe final stage of the process is the colouring. There are two possible options here: electrolytic colouring and integral colouring. Electrolytic colouring involves the use of a secondary bath, whilst integral colouring is applied at the same time as the main anodising.
The benefits of anodising
– The finish provided using anodising is totally uniform, easy to maintain, and abrasion-resistant. The added layer is strong and durable.
– The anodising process gives significant control over the final appearance of the product. Colour can be added, and different finishes can be achieved.
– Anodised aluminium is 100% recyclable, and the production processes do not produce harmful emissions.
Experts in surface treatments
If you feel that surface treatments such as anodising could benefit you/your business, there are a number of companies that specialise in this. Many of these firms, such as poeton.co.uk/standard-treatments/, also have useful online resources.
Applications
Anodised aluminium can be found on satellites, within computer hardware, in home appliances, and even on buildings.
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