Let’s look at six FAQs about the electrochemical process known as anodising.
1. What is anodised aluminium?
When exposed to the air, aluminium naturally forms a thin oxide film that prevents further corrosion. Anodising deliberately enhances this layer, creating a tougher, more stable barrier that resists damage and wear.
2. How does the process work?
Formed aluminium parts are placed in an electrolytic bath and exposed to an electrical current. This triggers controlled oxidation, building a thicker protective coating that is integral to the metal. This highly specialised process is available from companies such as www.poeton.co.uk/surface-treatments/anodising/.
3. Does anodising improve wear resistance?
Yes, the oxide layer behaves like a ceramic surface, offering excellent protection from scratches, abrasion, and everyday handling.
4. Is anodised aluminium more corrosion-resistant?
Yes, the dense oxide film formed during anodising is chemically stable and acts as a robust barrier that shields the underlying aluminium from environmental attack, moisture, and corrosive elements such as salts and chemicals. This anodic layer is much thicker and more durable than the naturally occurring oxide on untreated aluminium, making it significantly more resistant to degradation and corrosion.
5. Can anodised parts be coloured?
Yes, the porous structure of the anodised coating absorbs dyes, which are then sealed in by a hot water or steam process to produce long-lasting, fade-resistant finishes. This pore absorption allows for vibrant colour penetration and retention that won’t chip, peel, or easily wear away.
6. Does anodising aid adhesion?
The micro-porous surface helps primers and adhesives bond more effectively, improving paint performance and structural joins.
