Crevice corrosion identification

Identification of localized corrosion The attack was due to crevice corrosion. The rolled joint was not very tight, and, therefore, the steam condensate penetrated into the gap. A differential aeration cell was formed due to the depletion of oxygen in the crevice formed by the rolled joint because of its not being tight. 

The identification of corrosion controlhng factors requires a deep knowledge of the nature and mechanism of a corrosion process. In mai cases, the most important controlling factors for aqueous corrosion include solution composition, temperature, aeration, flow velocity, test duration, specimen surface condition, the volume of the test solution, pressure, pH, wear or abrasion effects, and the existence of crevices on the test specimen... 

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