Aluminium cladding is a popular choice for exterior applications due to its sleek appearance, durability, and resistance to environmental factors. However, one question that often arises is whether aluminium cladding can catch rust, especially when exposed to outdoor conditions. This article explores the properties of aluminium, its susceptibility to rust, and how to maintain it for long-lasting performance.

Understanding Rust and Aluminium

What is Rust?

Rust is a type of corrosion that occurs when iron reacts with oxygen and moisture, forming iron oxide. It is commonly seen on steel and iron-based materials but not on non-ferrous metals like aluminium.

Why Aluminium Doesn’t Rust

Aluminium, being a non-ferrous metal, does not rust in the traditional sense because it lacks iron. Instead, it forms a protective layer of aluminium oxide when exposed to air. This natural oxide layer prevents further oxidation and acts as a barrier against environmental damage.

Can Aluminium Cladding Corrode?

While aluminium doesn’t rust, it can corrode under certain conditions. Corrosion occurs differently in aluminium compared to iron and steel.

Types of Aluminium Corrosion:

1. Pitting Corrosion: Small holes or pits may develop if aluminium comes into contact with chlorides, such as salt in coastal areas.
2. Galvanic Corrosion: Occurs when aluminium is in contact with a different metal in the presence of an electrolyte, such as water.
3. Filiform Corrosion: A cosmetic issue where thread-like corrosion forms under painted surfaces if moisture seeps through.

Despite these risks, aluminium cladding is highly resistant to most forms of corrosion when properly maintained.

Why Aluminium Cladding is Ideal for Exteriors

Aluminium cladding is specifically designed for outdoor use, offering several advantages over other materials.

Benefits of Aluminium Cladding:

• Corrosion Resistance: The protective oxide layer makes it highly resistant to weather-related damage.
• Lightweight: Aluminium’s low weight reduces the structural load on buildings.
• Durability: It withstands extreme temperatures, UV rays, and environmental pollutants.
• Low Maintenance: Requires minimal upkeep compared to materials like wood or steel.

Factors That Can Affect Aluminium Cladding

While aluminium is naturally resistant to rust and corrosion, certain environmental and situational factors can affect its longevity.

Environmental Factors:

1. Saltwater Exposure: In coastal areas, salt particles can accelerate pitting corrosion.
2. Pollution: Acidic rain or industrial pollutants may affect the oxide layer over time.

Maintenance Practices:

• Lack of regular cleaning can lead to the accumulation of dirt and pollutants, which may compromise the protective layer.
• Improper installation or using incompatible metals in conjunction with aluminium can lead to galvanic corrosion.

How to Prevent Corrosion in Aluminium Cladding

Preventive measures can ensure the long-term performance of aluminium cladding.

Tips for Prevention:

1. Regular Cleaning: Clean the cladding every 6-12 months with mild soap and water to remove dirt, salt, and pollutants.
2. Protective Coatings: Apply anodizing or powder coating to enhance resistance against corrosion.
3. Proper Installation: Use compatible materials and avoid direct contact with other metals.
4. Inspection and Maintenance: Periodically inspect the cladding for signs of corrosion or damage and address issues promptly.

Comparing Aluminium Cladding with Other Materials

Aluminium vs. Steel Cladding:

• Steel cladding, especially if untreated, is prone to rust, while aluminium is naturally rust-resistant.
• Aluminium is lighter and requires less maintenance compared to steel.

Aluminium vs. Wood Cladding:

• Wood cladding can decay, warp, or require frequent treatment, whereas aluminium is weather-resistant and durable.

Aluminium vs. Composite Panels:

• Aluminium offers better resistance to environmental factors compared to composite panels, which may delaminate over time.

Eco-Friendly and Sustainable Choice

Aluminium cladding is not only durable but also an environmentally friendly option for exterior applications.

Sustainability Features:

• Recyclability: Aluminium is 100% recyclable, reducing its environmental footprint.
• Energy Efficiency: Reflective properties can help regulate building temperatures, reducing energy consumption.

When to Consider Professional Help

If you notice discoloration, pitting, or signs of corrosion on your aluminium cladding, it may be time to consult a professional. Professionals can assess the damage, recommend suitable treatments, and ensure the cladding is properly maintained.

Conclusion

Aluminium cladding is an excellent choice for exterior applications due to its resistance to rust and corrosion. While it does not rust like iron or steel, it is essential to maintain and protect it against potential environmental challenges. With proper care, aluminium cladding can retain its appearance and structural integrity for decades, making it a cost-effective and sustainable option for modern buildings.

Read More – How to Clean Metal Cladding in Elevation