UNIT: 2 CORROSION AND ITS CONTROL Lecture Session 10 ...

1. UNIT: 2 CORROSION AND ITS CONTROL . Lecture Session 10: Topics: Concepts of CORROSION , its types, mechanism of chemical CORROSION Introduction CORROSION is defined as the loss of materials as a result of chemical or electrochemical reaction with the environment. The process of CORROSION is slow, but the losses due to it are enormous which cannot be measured in terms of the cost of metal alone, but also the cost of fabrication. Now-a-days it is necessary to pay more attention to CORROSION because of increasing use of metals in all fields of e n g i n e e r i n g a n d technology. Therefore, knowledge about different forms of CORROSION and prevention is essential to minimise the maintenance and replacement cost of the material. CORROSION is defined as the gradual destruction of metals or alloys by the chemical or electrochemical reaction with its environment.

It is due to the direct chemical attack on metals by atmospheric gases such as oxygen, carbon-di-oxide, hydrogen sulphide, etc. It follows adsorption mechanism. Corrosion product accumulate in the same spot of corrosion. Example : Tarnishing of …

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