Question

difference between crevice corrosion and pitting corrosion

Answer 1

Pitting corrosion is one of the most damaging forms of corrosion. ... The processes inside the crevice is essentially the same as the propagation of pitting. Stainless steels and alloys are particularly susceptible to pitting and crevice corrosion.
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Answer 2

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When a metal is atacked by its surrounding air , moisture , acid etc it is said to be corroded . The process is called corrosion.

Electrochemical corrosion of metals occurs when electrons from atoms at the surface of the metal are transferred to a suitable electron acceptor or depolarizer. Water must be present to serve as a medium for the transport of ions.