Mechanisms, Forms, and Modes of Corrosion Failures

In practice, the terms mechanisms, forms, and modes of corrosion failures are often used interchangeably, leading to some confusion. Such loose usage does not do justice to the significant serious work that has been invested in defining these separate concepts. A clearer picture should emerge from the material that follows. 

Form of corrosion is generally well known from one of the most enduring books on corrosion engineering. The different forms of corrosion represent corrosion phenomena categorized according to their appear- 

The main forms of corrosion are shown in Fig. 5.1, together with the respective group categories. In this figure, the number of forms has been expanded somewhat from Fontana s original grouping of eight basic forms. A description and an example of each basic form of corrosion follows. 

Group II identifiable with special inspection tools 

Area covered by reddish brown corrosion products 

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