In a residential campus an Iron pole partially buried under the earth got corroded. What type of corrosion this is & what might be the probable cause of corrosion. Find out the factors which are responsible for corrosion and how this can be avoided.

The type of corrosion that the iron pole on a residential campus is experiencing is likely "soil corrosion." This is a common type of corrosion for metals buried underground.

Soil corrosion occurs when the moisture, oxygen, and salts present in the soil react with the metal, causing it to corrode. The specific cause of the corrosion can vary depending on the type of soil, the presence of bacteria, and the characteristics of the water in the soil.

Several factors can contribute to soil corrosion:

1. Soil Resistivity: Soils with low resistivity (high conductivity) are more corrosive. This is often due to high moisture and salt content.

2. pH Level: Soils with extreme pH levels (either too acidic or too alkaline) can be corrosive.

3. Moisture Content: Wet soils are more corrosive than dry soils.

4. Oxygen Content: Corrosion is an oxidation process, so the presence of oxygen can accelerate it.

5. Microbial Activity: Certain bacteria can cause or accelerate corrosion.

To avoid soil corrosion, several measures can be taken:

1. Material Selection: Use corrosion-resistant materials for construction, such as stainless steel or certain types of treated wood.

2. Coatings and Wrappings: Apply protective coatings or wrappings to the metal. These act as a barrier between the metal and the corrosive elements in the soil.

3. Cathodic Protection: This is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell.

4. Regular Inspection and Maintenance: Regularly inspect the structure for signs of corrosion and perform necessary maintenance to prevent further damage.

5. Control of Soil Conditions: If possible, control the moisture and pH level of the soil to reduce its corrosiveness.