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Asked by Mohd Last Modified
Answer 
Apoorva Purohit
Corrosion is the decay of metal when it is exposed to the elements in the environment.
Scientifically, it is the oxidation of a metal which forms a layer of metal oxide on the top layer.
Advantages of corrosion
Disadvantages of Corrosion
Corrosion is oxidation of iron due to the oxygen in the air. Iron becomes iron oxide which deposits on the surface of iron and we call it rust.
Disadvantage-It reduces the tickness of the iron body. It loses strength over the years can become too weak to carry the load it is intended to.
Advantage There is hardly any but we may consider it advantageous when the surface layer of corrosion prevents the inner core material to come in contact with the oxygen in the air and get corroded.
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Advantages:
i. Protection : Surface corrosion forms an oxide layer which further protects the inner metal form corrosion.
ii. Corrosion prevents corrosion: Some metals like zinc are used as sacrificial anodes to prevent corrosion to other metal.
iii. Galvanic corrosion: The principle on which primary batteries work. In which one metal corrodes preferentially to another when both metals are in electrical contact, in the presence of an electrolyte.
Disadvantages Of Corrosion:
1. Weakens material due to prolonged corrosive action.
2. Loss, contamination, and deterioration of the appearance of a material.
3. Safety, health and environmental risks due to corrosion, especially in manufacturing plants.
4. Corrosion tends to vent in technical malfunctions in machines.
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