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Aluminium corrosion resistance
Jul 21, 2017

Aluminium corrosion resistance is very good in untreated aluminium. Untreated aluminium has very good corrosion resistance in most environments. This is primarily because aluminium spontaneously forms a thin but effective oxide layer that prevents further oxidation.

Aluminium oxide is impermeable and, unlike the oxide layers on many other metals, it adheres strongly to the parent metal. If damaged mechanically, aluminium’s oxide layer repairs itself immediately.

This oxide layer is one of the main reasons for aluminium’s good corrosion properties. The layer is stable in the general pH range 4 – 9.

Galvanic corrosion

1.Pitting

2.Crevice corrosion

3.Aluminium in the open air

4.Aluminium in soil

5.Aluminium in water

6.Aluminium and alkaline building materials

7.Aluminium and chemicals

8.Aluminium and dirt

9.Aluminium and fasteners


The most common types of aluminium corrosion are:

  • galvanic corrosion

  • pitting

  • crevice corrosion

Stress corrosion, which leads to crack formation, is a more special type of corrosion. It occurs primarily in high-strength alloys (e.g. AlZnMg alloys) where these are subjected to prolonged tensile stress in the presence of a corrosive medium.