First slide

Corrosion

Question

In which of the following will the corrosion of iron be most rapid ?

Moderate

A

In pure water
B

In pure oxygen
C

In air and moisture
D

In air and saline water

Solution

$2 Fe + O_{2} + 4 H^{+} \to {Fe}^{+ 2} + 2 H_{2} O; E^{o} = 1.67 V$
Moisture in air leads to the formation of H₂CO₃ or H₂SO₃which gives H⁺ ions that favours corrosion.
Saline water also has low pH value which favours corrosion.

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