This is increased to about 0.3 mm/year under boiling at 70 watt/cm2. People often mix the two terms rust and corrosion. Couple that with the fact that it is a grayish color very similar to aluminum, and you may never even notice your aluminum’s rust. At 230 C in flowing water a corrosion rate of 0.1 mm/year is observed. Nonetheless, rust is a kind of corrosion, and though aluminum does not rust, it can corrode. It doesn’t flake off like iron oxide and therefore, once the outer layer of aluminum “rusts” the process stops and the aluminum is protected. It is actually quite hard and serves as a protective coating around the underlying aluminum. Iron oxide (rust) is a soft red colored metal that begins to expand and flake off as it is chemically transformed which exposes more of the underlying steel or iron to the air and the process continues until the metal is completely transformed to iron oxide.Īluminum oxide is different. When exposed to oxygen, it forms aluminum oxide, just like steel forms iron oxide, but the difference lies in the chemical makeup of these two oxides. It just rusts in a different way than steel and iron rust. The short answer is, yes, aluminum does rust. You already know that aluminum can last outside for decades, but what you want to know is does aluminum rust, right? Does aluminum rust? It’s a valid question and one that a lot of folks think they have the answer to, but you may be surprised by what I have to tell you about aluminum and its ability to stand up to corrosion.Īluminum is seen as a rockstar of corrosion resistance and is one of the few metals, along with stainless steel, that can hold up to exterior and coastal exposures over long periods of time. However, aluminium allows does oxidize, but when water hits the surface of the metal it forms a protective layer aluminium.
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