What Is the Reason for Aluminum Natural Oxidation? -Aluminum Profiles Supplier
Author： WJW Aluminum Window Manufacturers
The natural oxidation of aluminum is caused by electronic exchange between aluminum and oxygen in the air. This process will produce a layer of alumina. In the process, aluminum obtained a positive charge by transferring electrons to oxygen atoms, while oxygen atoms obtain negative charge. These changes have changed the total charge of aluminum. The oxidation layer is part of the aluminum structure. When water and aluminum are in contact, they are corroded. When aluminum is physical connected with another metal (such as magnesium), it will corrode an electric puppet. The corrosion strength of these two metal intersections is the most. This corrosion occurs faster than atmospheric corrosion.
Another type of corrosion is called point erosion, which occurs when the aluminum surface forms a small hole. This type of corrosion is accompanied by erosion, which will affect the aesthetics of the workpiece.
Another type of corrosion is caused by microorganisms, and these microorganisms usually exist in fuel or lubricating fuel tanks. When metal is corroded by these biology, it produces acidic compounds. Although aluminum does not rust, it will corrode if it is not maintained. In a mild climate, the oxidation process will be slow. In a large pressure climate, such as humid or rainy climate, the corrosion speed of aluminum will be faster. Cleaning and drying can help prevent aluminum corrosion. The production process of aluminum began with the extraction of aluminum mines. Aluminum ore is a mineral rich in alkaline metal. The ore was then dissolved in a harsh sodium mixture. Then heat the slurry to 230 to 520, and then filter. The generated aluminum oxide slurry was transferred to the sedimentation tank. The seeds are added to the mixture to stimulate the precipitation process. When the surface of the aluminum is exposed to the air containing salt, the aluminum will occur naturally. Salt air can cause the surface to form a white aluminum layer.
However, as long as the air contains sulfides or chloride, the layer will not corrode aluminum. These two species are found in polluting areas.
Due to the strong affinity of aluminum oxygen, the oxidation speed of aluminum is faster than the oxidation speed of steel.
Once all aluminum atoms are combined with oxygen, it will stop. The resulting aluminum oxide layer formed a protective layer on the newly exposed aluminum, which inhibits the rust process.
Without this protective layer, aluminum will continue to corrode and lose strength. Aluminum materials usually exist on the surface of the ocean with a concentration between 0.013 and 5. The same is true of river water, containing 400 PPB aluminum. In an acidic environment, aluminum is dissolved in the form of hydrophilic compounds. Under neutral and alkaline conditions, metals form a thin layer of alumina. This layer prevents aluminum metals from reacting with water and release of highly flammable hydrogen.
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