Chloride crevice corrosion
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The mechanism of crevice corrosion is the same as that of pitting corrosion; it is a corrosion phenomenon caused by the accumulation of Cl ions due to the presence of closed cells within the crevices. This type of corrosion generally occurs in the gaps of flange gaskets, lap joints, bolt nuts, as well as in the gaps between heat exchange tubes and tube sheet holes. Gap corrosion is closely related to the concentration of the liquid that remains stagnant in these gaps; once such an environment for gap corrosion exists, the likelihood of stress corrosion occurring is very high.
The mechanism of crevice corrosion is the same as that of pitting corrosion