Q:Does aluminum rust?

No, aluminum does not rust. Rust is a corrosion product associated with iron and iron-rich alloys (such as steel). When exposed to oxygen, it forms a thin, tightly adhering film of aluminum oxide, which slows further corrosion rather than peeling off and exposing new metal. This oxide film is a key reason why aluminum is widely considered a naturally corrosion-resistant metal. It protects the aluminum inside from further corrosion, hence the common saying "aluminum doesn't rust."

The rust formed when iron rusts is loose and porous, and it will continue to corrode inwards; the oxide film of aluminum is dense, and its properties are different.

However, under conditions such as strong acid, strong alkali, seawater/chloride ion environment, mercury salt, etc., the oxide film of aluminum will be destroyed, and aluminum will also be corroded, resulting in phenomena such as whitening, powdering, and pitting, sometimes called "white rust" or aluminum corrosion.

Aluminum does not rust like iron, but it can oxidize and corrode under certain conditions.

Time：11/11/2026 15:38:47