| Crevice Corrosion |
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| CATEGORIES ABOUT CREVICE CORROSION | |
| metallurgy | |
| corrosion | |
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Crevice corrosion is extremely dangerous because it is localized and can lead to the component failure while the overall material loss is minimal. The initiation and progress of crevice corrosion can be difficult to detect. The mechanism of crevice corrosion can be (but not always is) similar to that of Pitting Corrosion . However, there are sufficient differences to warrant a separate treatment. For example, in crevice corrosion, one has to consider the geometry of the crevice and the nature of the concentration process leading to the development of the differential local chemistry. The extreme and often unexpected local chemistry conditions inside the crevice need to be considered. Galvanic effects can play a role in crevice degradation. The susceptibility to crevice corrosion varies widely from one material-environment system to another. In general, crevice corrosion is of greatest concern for materials which are normally passive metals, like stainless steel or aluminum. Crevice corrosion tends to be of greatest significance to components built of highly corrosion-resistant Superalloys and operating with the purest-available water chemistry. For example, steam generators in nuclear power plants degrade largely by crevice corrosion. |
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