13 Determine the type of corrosion has been occurred in the

13. Determine the type of corrosion has been occurred in the following pictures.

Solution

First picture : Crevice corrosion or contact corrosion produced at region of contact of metals with metals or non metals, In general like contact with washers between two parts

Second picture: Pitting is localised that occurs at microscopic defects on a metal surface

Third picture : This is also called as general corrosion, the surface effects produced due to chemicals and atmospheric conditions