Question

When two dissimiler metals are in direct contact the type of corrosion is a stress corrosion b galvanic corrosion c acid medium corrosion d pitting corrosion

Answer 1

Galvanic corrosion, or dissimilar metal corrosion, occurs when two different metals are located together in a corrosive electrolyte. A galvanic couple forms between the two metals, where one metal becomes the anode and the other the cathode. The anode, or sacrificial metal, corrodes and deteriorates faster than it would alone, while the cathode deteriorates more slowly than it would otherwise.

@Electrochemically dissimilar metals must be present

@The metals must be in electrical contact, and

@The metals must be exposed to an electrolyte

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.