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Iron corrodes faster than aluminium even though iron is placed below aluminium in the electro chemical series. Why?

Iron corrodes faster than aluminium even though iron is placed below
aluminium in the electro
chemical series. Why?

Grade:

4 Answers

India VK
42 Points
10 years ago

Aluminium forms a coating of Al oxide which is a hard layer and prevents further rusting of Aluminium.

With iron the layer of iron oxide formed is flaky and cannot prevent the layer beneath from corroding further.

Yashaswi pradhan
19 Points
6 years ago
This can be explain by the fact that aluminum forms a non-porous, very thin tightly adhering protective oxide(Al2O3)on its surface and this film does not permit corrosion to occur.
Mithun Ganapathy
27 Points
2 years ago
pilling-bedworth rule
Mithun Ganapathy
27 Points
2 years ago
It can be explained by Pilling-Bedworth rule. When Aluminium reacts with oxygen, the volume of aluminium oxide layer is greater than the volume of aluminium used. Thus, the oxide layer formed by aluminium is non-porous, protective and prevents further corrosion. While in the case of Iron, the volume of oxide layer formed is lesser and thus oxide layer is porous, non-protective and induces further corrosion.

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