Zinc is used in the galvanisation of iron and not copper
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Zinc is more reactive than iron, but that is only part of the reason that it is used in the galvanization process,
The best galvanization process is called hot dip because the iron is cleaned and then dipped into a flux-molten zinc bath. This not only covers the iron with zinc, but also makes a layer of iron-zinc alloys which fills the tiny cracks and imperfections on the surface of the iron.
The zinc will react with atmospheric oxygen to form zinc oxide and this, in turn, reacts with atmospheric carbon dioxide to form zinc carbonate which lessens further 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.
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Zinc is more reactive than iron, but that is only part of the reason that it is used in the galvanization process,
The best galvanization process is called hot dip because the iron is cleaned and then dipped into a flux-molten zinc bath. This not only covers the iron with zinc, but also makes a layer of iron-zinc alloys which fills the tiny cracks and imperfections on the surface of the iron.
The zinc will react with atmospheric oxygen to form zinc oxide and this, in turn, reacts with atmospheric carbon dioxide to form zinc carbonate which lessens further 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.
----- HOPE IT HELPS ---
Anonymous:
did it ??
is it in ncert??
ok
from where u read it
okk
yaa i wanna this ans because i read it in Google that. tge make alloy
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