Anodised Aluminium
Anodised aluminium is aluminium that has been through the anodising process to form an additional aluminium oxide layer that forms around the surface of the metal. Anodised aluminium is lightweight, strong and has great protective properties, though it does mean the aluminium is harder to weld, work or form than if it were left untreated.
Anodised aluminium is used for a wide range of projects; it has excellent corrosion resistance, and offers additional protection to the metal, so is often used in outdoor applications or environments where products will be exposed to moisture, wind or water, such as architectural or marine uses.
Key benefits of anodised aluminium:
- Enhanced durability: Anodising dramatically improves aluminium's corrosion resistance, which makes it perfect for outdoor applications, marine environments, and areas exposed to moisture or harsh weather conditions.
- Lightweight strength: Anodised aluminium retains the inherent lightness of aluminium while offering superior strength for various structural and functional needs.
- Workability: While slightly more challenging to weld or form than untreated aluminium, anodised aluminium remains adaptable for various fabrication techniques.
When searching for anodised aluminium at metals4U, you will encounter several product types, each catering to specific project requirements:
- Anodised aluminium angle: This L-shaped profile offers exceptional strength and rigidity, making it ideal for framing, support structures, and corner reinforcements.
- Anodised aluminium channel: This U-shaped profile provides excellent support and a clean aesthetic. Its versatility makes it suitable for applications like railings, furniture frames, and decorative trims.
- Anodised aluminium flat bar: This solid, rectangular bar offers superior strength and a smooth surface. It is a popular choice for building components, machinery parts, and various fabrication projects.
Want to delve deeper into the world of aluminium and its different forms? Visit our comprehensive aluminium product range.
What is anodised aluminium?
Anodising is a sophisticated electrochemical process that dramatically enhances the properties of aluminium. This process involves submerging aluminium in an acid electrolyte bath and utilising an electric current through the solution. Here is a breakdown of the method:
- Electrolyte bath: The aluminium component is submerged in a specially prepared acid electrolyte bath, typically containing sulphuric, chromic, or phosphoric acid.
- Electrical current: A direct current is applied to the aluminium, causing it to become the anode (positive electrode) in the electrochemical cell.
- Oxidation: As the current flows, oxygen ions from the electrolyte are drawn to the aluminium's surface. These oxygen ions react with the aluminium atoms, forming a protective aluminium oxide layer (Al2O3).
- Anodic layer formation: Factors like current density, electrolyte composition, and time can be adjusted to control the thickness and properties of the anodic layer. A thicker anodic layer provides greater corrosion resistance, durability, and insulation properties.
- Sealing: A sealing process is typically carried out to ensure the durability and long-term performance of the anodised layer. This involves treating the anodised aluminium with a hot water or steam bath, which closes the pores of the anodic coating, improving its resistance to corrosion and abrasion. The aluminium oxide layer created through the chemical reaction is bonded to the metal and will not chip or flake off.
A thicker anodic layer offers several advantages:
- Enhanced corrosion resistance: The thicker layer provides a more effective barrier against corrosive agents, protecting the underlying aluminium from rust, pitting, and other forms of deterioration.
- Improved durability: A thicker anodic layer makes it tougher and longer-lasting, perfect for various applications where the aluminium will be subjected to abrasion, scratching, or impact.
- Increased insulation properties: Anodised aluminium with a thicker layer exhibits improved electrical insulation, making it ideal for use in electrical and electronic components.
- Enhanced adhesion: The thicker anodic layer provides a better surface for bonding with coatings, adhesives, or other materials, guaranteeing a secure and lasting bond
By understanding the anodising process and the benefits of a thicker anodic layer, you can make informed decisions when selecting anodised aluminium for your projects, ensuring optimal performance and durability.
Learn more about anodised aluminium
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What grade is anodised aluminium?
Our anodised aluminium products are supplied in 6063 grade, a medium strength alloy often referred to as an architectural alloy due to its most common applications.
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What colour is anodised aluminium?
Anodised aluminium is similar silver colour to mill finish aluminium, though with a more uniform surface and good reflectivity. Anodised aluminium looks smooth, but not as shiny as polished aluminium. Anodised aluminium can also be painted.
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How is anodised aluminium made?
Anodised aluminium is made when the untreated aluminium is submerged in an electrolyte solution and placed under a current to create a uniform aluminium oxide layer that acts as additional protection against damage and corrosion.
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Is anodised aluminium heavy?
Anodised aluminium is a great lightweight option, with an excellent strength-to-weight ratio, making it a popular choice for many automobile, aerospace and marine applications.
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What are the benefits of anodised aluminium?
Anodised aluminium offers a wide range of benefits, making it a preferred material for various applications. Here is a closer look at its key advantages:
- Exceptional durability: Corrosion resistance: Anodising creates a protective oxide layer on the aluminium surface, significantly enhancing its resistance to corrosion and weathering. This makes it ideal for outdoor applications, marine environments, and other areas exposed to harsh conditions.
- Lightweight strength: High strength-to-weight ratio: Anodised aluminium retains its excellent strength-to-weight ratio, making it a preferred option in industries where reducing weight is essential. This includes aerospace, automotive, and marine applications.
- Recyclability: Environmentally friendly: Anodised aluminium is fully recyclable, making it a sustainable and environmentally friendly material. This supports the increasing focus on minimising waste and advancing circular economy initiatives.
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Is anodised aluminium heavy?
No, anodised aluminium is relatively lightweight. Its excellent strength-to-weight ratio makes it a great fit for applications where weight reduction is a priority. This includes industries such as aerospace, automotive, and marine, where reducing weight can improve fuel efficiency and performance.
At metals4U we are experts in all things metalwork.
If you have any questions about our anodised aluminium products, are looking for advice on an upcoming metalwork project, or you’d like to place an order over the phone, don’t hesitate to give us a shout on 01937 534 318.
And don’t forget, when you buy your anodised aluminium from us, we offer fast, free delivery on orders over £95 across England and Wales.
