Crevice Corrosion

 

Crevice or contact corrosion is the corrosion produced at the region of contact of metals with metals or metals with nonmetals.

It may occur at washers, under barnacles, at sand grains, under applied protective films, and at pockets formed by threaded joints.

Whether or not stainless steels are free of pit nuclei, they are always susceptible to this kind of corrosion because a nucleus is not necessary.

Cleanliness, the proper use of sealants, and protective coatings are effective means of controlling this problem. Molybdenum-containing grades of stainless steel (e.g. 316 and 316L) have increased crevice corrosion resistance

Provided by:  CTT

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