Does aluminum rust?
Many people believe their aluminum wheels are rusting when they see brown or reddish spots on the surface when in fact aluminum does not rust. Understanding what’s really happening can help you prevent permanent damage and keep your wheels looking new.
What’s Really Causing the “Rust”?
Most modern wheels are made from aluminum alloy, which does not rust like steel. The spots that look like rust typically originate from extended exposure to brake dust which contains iron. When these iron particles land on the wheel surface, they can become embedded in the protective clear coat (or the raw aluminum if not clear coated). Over time, this creates rust colored spots that make it appear as though the wheel is rusting.
These particles originate from steel brake components such as:
- Brake rotors
- Brake pads
Why This Can Become a Serious Problem
If iron deposits are left on the wheel too long, the exposure can lead to real damage.
As the iron particles are in contact with the wheel, they expand. This expansion can:
- Crack or break through the wheel’s clear coat
- Allow moisture to reach the aluminum underneath
- Cause pitting and corrosion
- Lead to peeling or failure of the wheel finish
Once the protective coating is compromised, the damage to the finish is typically irreversible.
How to Prevent Iron Deposits on Wheels
The best protection is regular cleaning and maintenance.
1. Wash Wheels Frequently
Regularly rinse off brake dust before it has time to embed in the finish.
2. Address Rusting Brake Components
If brake parts begin to rust, they should be repainted or replaced promptly. Rust will continue to spread and produce iron oxide that can contaminate the wheel surface.
3. Clean Brake Dust Promptly
The longer brake dust sits on the wheel, the more likely it is to bond with the coating.
How to Remove Iron Deposits
If caught early, iron contamination can usually be removed.
Use an Iron Remover Cleaner
Specialized wheel cleaning products, often called iron removers, are designed to dissolve iron particles embedded in the wheel finish.
How they work:
- Spray the product on the wheel surface.
- The chemical reacts with iron deposits.
- The cleaner typically turns purple or pink as it dissolves the iron.
- Rinse thoroughly to remove the contamination.
Iron removers are most effective before the wheel coating is damaged. Unfortunately, if iron particles have already penetrated the clear coat and caused corrosion, peeling or rust colored spots it's too late to use a specialty cleaner. The wheel would need to be stripped and refinished.
Key Takeaway
If your aluminum wheels appear to be rusting, the cause is usually iron particles from brake dust—not the aluminum wheel itself. Regular cleaning and early treatment with iron-removing products can prevent permanent finish damage and keep your wheels looking their best.