**4. Adverse economic and social effects of corrosion**

The corrosion affects severely on the safe, reliable and efficient operation of equipment and structures than the simple loss of a mass of metal [14]. Failures of all kind of machineries and the need for expensive replacements may occur even though the amount of metal destroyed is quite small. Some of the major harmful effects of corrosion can be listed below:

Nuclear plant shutdown due to failure, for example, nuclear reactor during decontamination process.

