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Will aluminium rust series#

Pitting Corrosion: For aluminum, the most common pitting corrosion is halide ion, and chloride ion (Cl-) is the most common in use, such as NaCl (saltwater, the main source is seawater).

Will aluminium rust series#

The main one in this series is 6061 aluminum alloy.Ĭorrosion of Aluminum and Aluminum Alloys 6xxx series, contains approximate proportions of silicon and magnesium to form magnesium silicides, which makes them heat-treatable and has good corrosion resistance.As the magnesium content increases, the tendency of pitting corrosion increases as the amount of cold working deformation increases, the susceptibility to stress corrosion and denudation increases. 5xxx series, Magnesium is the main alloying element, have pitting corrosion, intergranular corrosion, stress corrosion and denudation tendency.This is due to the fact that silicon particles are highly polarized, resulting in low corrosion current density. 4xxx series, silicon is the main element, but silicon has the least influence on the corrosion resistance of these alloys.Better than pure aluminum in dilute hydrochloric acid No such alloys have a tendency to stress corrosion cracking. The corrosion resistance in the atmosphere is similar to that of industrial pure aluminum, the same as pure aluminum in seawater. 3xxx series, Manganese is the main alloying element in this type of alloy.

Therefore, these alloys are usually coated with 6xxx series high-purity alloys or magnesium-silicon alloys in sheet form to provide electrical protection for the core material, thereby greatly improving corrosion resistance.

2xxx series, Copper is the main alloying element, these alloys do not have good corrosion resistance like most aluminum alloys, and under certain conditions, they may be subject to intergranular corrosion.

1xxx series, unalloyed (pure) aluminium, purity ≥ 99.00%, have excellent corrosion resistance.

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.