How Galvanic Corrosion Occurs?

Galvanic corrosion occurs when two dissimilar metals are immersed in a conductive solution and are electrically connected. One metal (the cathode) is protected, whilst the other (the anode) is corroded. The rate of attack on the anode is accelerated, compared to the rate when the metal is uncoupled.

What is required for galvanic corrosion?

For galvanic corrosion to occur, three conditions must be present: Electrochemically dissimilar metals must be present. These metals must be in electrical contact, and. The metals must be exposed to an electrolyte.

What is galvanic corrosion example?

Examples of corrosion. A common example of galvanic corrosion occurs in galvanized iron, a sheet of iron or steel covered with a zinc coating. ... Instead, the zinc is corroded because it is less "noble"; only after it has been consumed can rusting of the base metal occur.