Question

Corrosion of water filled steel tanks occurs below the water line

Answer 1

yes , because corrosion occurs in the presence of moisture

Answer 2

Corrosion of water-filled steel tanks occurs below the waterline because that area is less oxygenated.

Detailed answer

Corrosion of water tanks always happens below the water-line as the less oxygenated and the area below the water-line has less oxygen content present near it and is not exposed to the air so it gets corroded easily.

• The area below the water-line acts as an anode and the above acts as a cathode.
• This process is also called aeration corrosion
• As we all know that above the water line there is less presence of water molecules so there is nothing that can trigger corrosion but there is still a small chance due to moisture.
• Down near the water-line there is water and dissolved air so corrosion occurs.