The process of removing the dull, white or gray film that forms on the surface of aluminum is a common maintenance task. This film, known as aluminum oxide, results from a chemical reaction between the metal and oxygen in the air. For example, weathered aluminum siding often requires cleaning to restore its original appearance.
Addressing this surface degradation is important for several reasons. Removal improves aesthetics, enhances the longevity of the metal by preventing further corrosion, and prepares the surface for painting or other protective coatings. Historically, various abrasive and chemical methods have been employed, each with varying degrees of effectiveness and potential risks to the underlying material.