NCERT grade 10 Science Chapter 1: Types of Chemical Reactions– Concepts and explanation: Part 4 Corrosion

 What is Corrosion?

Corrosion is a common phenomenon that transforms a refined material into a more chemically stable form, such as its oxide, hydroxide, or sulfide.  You must have noticed that some iron objects are covered with an orange or reddish-brown coloured layer at some point in time when exposed to moisture in air for a long time. The formation of this layer is the result of a chemical process known as rusting, which is a form of corrosion.

Corrosion Definition

It is basically defined as a natural process that causes the transformation of pure metals into undesirable substances when they react with substances like water or air. This reaction causes damage of metal as it interfaces with the environment and gradually spreads to the entire bulk of the metal. The following image show a corroded iron pipe.

 


Do All Metals Corrode?

Metals placed higher in the reactivity series, such as iron, zinc, etc., get corroded very easily, and metals placed lower in the reactivity series, like gold, platinum and palladium, do not corrode. Interestingly, aluminum doesn’t corrode, unlike other metals, even though it is reactive. This is because aluminum is covered by a layer of aluminum oxide already. This layer of aluminum oxide protects it from further corrosion.


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