Aluminium is widely used in architectural design due to its lightweight strength, fire resistance, and aesthetic versatility. However, untreated aluminium may not always provide the durability or visual appeal required for high-end applications. This is where surface treatments like anodising and aluminium powder coating come into play.

Whether you’re specifying Click-on Battens or large-format cladding, selecting the right finish is crucial for enhancing longevity, ensuring design consistency, and protecting against environmental factors. But which treatment method is right for your project: anodising or powder coating?

Two primary coating systems dominate architectural aluminium treatments: anodising vs powder coating. Each offers distinct advantages and trade-offs, making them more or less suitable depending on application, durability needs, and budget constraints.

See our full range of aluminium finishes available here.

To learn more about the design flexibility of aluminium, you can view our editorial here.

Anodising

What is Anodising?

Anodising is an electrochemical process that increases the thickness of the natural oxide layer on aluminium. This enhanced oxide layer provides superior corrosion resistance, durability, and colour retention, making it a preferred choice for high-end architectural applications.

Unlike untreated aluminium, which may corrode over time or develop inconsistencies in finish, anodised aluminium maintains its metallic sheen while offering long-lasting protection against wear, UV exposure, and harsh environments.

Where is Anodised Aluminium Used?

Anodised aluminium finishes are typically used in areas requiring colour stability, corrosion resistance, and a premium metallic aesthetic, such as:

• Exterior façades and curtain walls – where durability and resistance to weathering and corrosion are critical.
• Feature walls, ceilings, and soffits – particularly in lower-contact applications that benefit from a refined metallic appearance.
• Decorative architectural elements – where a consistent metallic colour and finish is important, but physical contact and abrasion are minimal.

Note: For high-traffic spaces prone to scratching or wear, a powder-coated finish is generally recommended instead of anodising, as anodised surfaces can be more susceptible to visible scratches.

Pros of Anodising

• Low Maintenance – Requires only periodic cleaning with mild detergent and water to retain its original finish.
• Integral to the Metal – The anodic coating does not peel or flake, as it is part of the aluminium itself.
• UV and Fade-Resistant – Unlike some coatings, anodising does not degrade under prolonged sunlight exposure.
• Consistent Aesthetics – Maintains uniformity from different viewing angles.
• Environmentally Friendly – Anodising produces no volatile organic compounds (VOCs) or heavy metals.
• Corrosion Resistance – Offers stronProvides excellent protection against corrosion, suitable for exterior applications.

Cons of Anodising (and How to Mitigate Them)

• Vulnerability to Acidic Pollutants – In urban environments, air pollutants can affect anodised surfaces over time. Regular cleaning can minimise this risk.
• Natural Colour Variation – The translucency of anodised coatings can lead to slight variations between batches. Specifying batch consistency upfront can help maintain a uniform appearance.
• Limited Finish Options – Anodised aluminium is typically available in matte and polished finishes, with fewer customisable colour options than powder coating.
• Colour Matching Challenges – Since anodised finishes are specific to aluminium, coordinating with other materials may require careful planning. Additionally, anodised surfaces can scratch and mark easily, making them unsuitable for high-traffic or high-contact areas.

Powder Coating

What is Powder Coating?

Powder coating is a decorative and protective finish applied to aluminium via an electrostatic spray process, where coated aluminum powder is electrostatically charged and fused onto the surface in a curing oven. This process results in a uniform, durable surface that resists chipping, fading, and corrosion.

Can you powder coat aluminium? Yes – powder coating provides an excellent finish for architectural applications, offering a vast range of colours and textures to suit any design intent.

Pros of Powder Coating

• Extensive Colour Selection – Available in a wide range of matte, satin, gloss, super matte, and textured finishes.
• Easy Repairs – Dents and scuffs can be repaired with liquid coatings that accurately match the original colour.
• Consistent Batch Colouring – Powder coating generally offers good colour uniformity between production batches; however, slight colour variations may still occur.
• Superior Chemical Resistance – Offers better protection against industrial cleaners and mortar exposure.
• Sustainable Process – Powder coating does not produce air pollution or VOCs, making it an eco-friendly choice.
• Durability and Weather Resistance – Powder coating vs anodising durability varies based on conditions, but coated aluminum powder excels in chemical-heavy or indoor applications.

Cons of Powder Coating (and How to Prevent Them)

• Filiform Corrosion Risks – If improper pre-treatment is used, corrosion may develop beneath the coating. Proper surface preparation prevents this issue.
• ‘Orange Peel’ Texture – A rough, uneven surface can result from improper application. Working with certified coaters ensures a smooth, high-quality finish.
• Chalking Over Time – White powder-like residue may develop if incorrect curing processes are used. Choosing high-quality powders and proper curing techniques prevents this issue.
• Less Realistic Timber Effect – The uniformity of powder coating makes it difficult to replicate natural wood grain textures. If a timber aesthetic is desired, consider a specialised wood finish aluminium.

Comparison Table

This side-by-side comparison highlights key differences in durability, colour options, cost, and maintenance. The choice between anodising and coated aluminum powder finishes depends on project needs, with each offering distinct advantages.

How to Choose the Right Treatment

• For exterior projects requiring durability and UV resistance, anodising is the best choice.
• For vibrant colours and cost-effective finishing, powder coating offers superior flexibility.
• For projects requiring wood-like finishes, consider why choose wood finish aluminium.
• For budget-conscious projects, see how much does aluminium cladding cost.

Maintenance Tips

Proper maintenance ensures your aluminium finish retains its aesthetic and protective qualities for years to come. Understanding the right cleaning methods for each finish will help maintain their integrity and prolong their lifespan.

• Anodised Aluminium: Clean periodically with mild detergent and water.
• Powder Coated Aluminium: Can aluminum be powder coated? Yes, but proper care is essential. Use a soft cloth and non-abrasive cleaner to avoid surface damage.

For more information about anodising, powder coating or our wood finish aluminium, please don’t hesitate to get in touch with one of our team members below.