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What is Galvanic Corrosion?


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Corrosion

  • A refined metal is changed into a more chemically stable oxide by the natural process of corrosion.
  • It is the gradual deterioration of materials (often a metal) by chemical or electrochemical reaction with their environment.
  • The corrosion of iron generally called rusting.

Galvanic Corrosion

  • When an electrolyte and two metals with differing electrode potentials come into contact with one another, one of the metals acts as a cathode and the other as an anode.
  • As a result, the anode dissolves into the electrolyte as a result of an electrochemical process.
  • This electrochemical process is called galvanic corrosion of metals.
  • A cathodic metal can be protected from corrosion by using galvanic corrosion.
  • Only in the presence of an electrolyte that may provide a path for the movement of ions and an electric conducting path between the metals does galvanic corrosion take place.
  • The use of zinc in batteries to promote corrosion and produce a potential difference is one example of the galvanic corrosion.
Galvanic Corrosion

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