Corrosion Resistance of Aluminium and Aluminum Alloys If other metals must be fixed to aluminum, it is recommended to use bituminous paint or insulating tape. In the presence of electrolyte, avoid direct contact with certain other metals otherwise, galvanic corrosion of aluminum may occur near the contact area. However, by covering the exposed surface with a thin layer of pure aluminum or an alloy with higher corrosion resistance, such alloys can be effectively protected from most corrosion effects.Īttention should also be mentioned. The corrosion resistance of some aluminum alloys is not as good as others, especially some high-strength aluminum alloys. Although metals can be safely used in the presence of certain weak bases with the help of corrosion inhibitors, direct contact with alkaline substances should generally be avoided. Aluminium Corrosion ResistanceĪlkali is one of the few substances that attack oxide films and therefore cause aluminum corrosion. In this article, “rust” refers to “corrode”, because rust is an iron oxide, which only occurs in iron and other iron-containing metals. Even in industrial environments that often corrode other metals, aluminum has high weather resistance. Unless exposed to certain substances or conditions that destroy the protective oxide coating, the metal still has adequate corrosion protection. This self-protection feature makes aluminum highly resistant to corrosion. When the surface of aluminum is exposed to the atmosphere, it will immediately form a thin invisible oxide film (Al 2O 3♳H 2O) to prevent further oxidation of the metal. Aluminum does not rust or corrode under most conditions of use and has high corrosion resistance.
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