1. Introduction to Corrosion

1.2 Definition of Corrosion

Corrosion is a natural process of destruction like earthquakes, tornados, floods, volcanic eruptions, etc. with one major difference. 

Whereas we can be only a silent spectator to the above processes of destruction, corrosion can be prevented or at least controlled. 

Several definitions of corrosion have been given, some of them are reproduced below:

  • Corrosion is the surface wastage that occurs when metals are exposed to reactive environments

  • Corrosion is the result of interaction between a metal and environments which results in its gradual destruction

  • Corrosion is an aspect of the decay of materials by chemical or biological agents

  • Corrosion is extractive metallurgy in reverse. For instance, iron is made from hematite by heating. Iron corrodes and reverts to rust after completing its life cycle. The hematite and rust have the same composition

  • Corrosion is the deterioration of materials as a result of reaction with its environment (M.G. Fontana)

  • Corrosion is destructive attack of a metal by chemical or electrochemical reaction with the environment (H.H. Uhlig)