Question

Waterline corrosion​

Answer 1

Waterline corrosion is a type of oxidation process that can happen to materials in contact with water. Waterline corrosion occurs when one portion of a base material is submersed in the water and another portion is in contact with the air. This creates a differential of the amount of oxygen in contact with the material's surface above and below the waterline and results in a corrosive reaction.

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Answer 2

The usual localized corrosion process known as water-line corrosion (WLC) is thought to result from the development of differential aeration cells (DACs).

• The region above the water's surface has a high oxygen content and functions as a cathode, whereas the region below has a lower oxygen content and functions as an anode.

• When there is differential aeration in a neutral medium, waterline corrosion happens.

• It typically appears in tanks, pipes, and gutters made of steel that have been neglected or corroded.
• Corrosion occurs in the area below the waterline that is oxygen-starved and protected by the cathodic layer.