Popularize the reason why aluminum alloy will not rust

Popularize the reason why aluminum alloy will not rust

Products processed by aluminum alloy are currently in many fields have a good application, such as the aviation industry will basically use aluminum alloy as its own construction materials. Recently, Xiaobian received a question, that is, someone asked Xiaobian why aluminum alloy does not rust? In fact, this question is not appropriate, because aluminum alloy will rust, but rust will not be directly corroded, but has been rusty.

Generally speaking, the rust of aluminum alloy and we usually feel iron rust is a completely different concept, if the aluminum profile is polished directly, it will become very good-looking, the problem is not very big. However, due to contact with oxygen, the surface quickly formed an oxide film - aluminum oxide, in fact, this is the result of rust.

Metal is rusted when oxidized by oxygen in the air. Aluminum reacts with oxygen to form aluminum oxide, which is aluminum rust. Aluminum rust is very thin, its thickness is only one millionth of a millimeter, but it is very hard, very wear-resistant. It is close to the surface of aluminum, so that the aluminum inside can not contact the outside air, prevent aluminum from continuing to rust. So the appearance of aluminum looks more beautiful than iron, but also more durable than iron.

How is aluminum made of aluminum embroidery? In fact, alumina film also has a "Nemesis" : one is a base, one is an acid. When alumina meets them, it reacts chemically, forming compounds that fall off very easily. Some people say why aluminum is a non-ferrous metal, in fact, the narrow sense of non-ferrous metals, also known as non-ferrous metals, is a general term for all metals other than iron, manganese and chromium; The generalized non-ferrous metals also include non-ferrous alloys (alloys consisting of a non-ferrous metal as a matrix (usually greater than 50%) and adding one or more other elements).

So how can green make aluminum alloy not rust? This has certain requirements for aluminum alloy processing, such as aluminum oxide film requirements are generally relatively high, like its thickness, hardness, generally more severe than the domestic requirements. Our Red Star aluminum has been favored by consumers in recent years, and we have put a lot of effort in the material of oxide film, so our aluminum alloy casting and processing products will not easily rust.