Why is zinc used for galvanizing iron and not copper?
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Zinc is more reactive than iron, it is used to protect it from corrosion because when oxygen in the air reacts with the surface of zinc, a very dense and impermeable coating of zinc oxide is formed and it is this physical barrier that protects the zinc surface from further attack
The problems with using a less reactive metal, such as copper, nickel, silver, gold or platinum is cost and possible cracking which would allow the air to reach the iron underneath and chip the less reactive layer away from the iron. These metals are difficult to form alloys with iron and go on a separate layer.
And also copper doesn't show corrosion.
The problems with using a less reactive metal, such as copper, nickel, silver, gold or platinum is cost and possible cracking which would allow the air to reach the iron underneath and chip the less reactive layer away from the iron. These metals are difficult to form alloys with iron and go on a separate layer.
And also copper doesn't show corrosion.
anandhini:
copper is less reactive than zinc
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Zinc is more reactive than iron, it is used to protect it from corrosion because when oxygen in the air reacts with the surface of zinc, a very dense and impermeable coating of zinc oxide is formed and it is this physical barrier that protects the zinc surface from further attack.
he asked it not done on copper
i asked why it is not done with copper
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