This corrosion tutorial document outlines key concepts about corrosion including: 1) A metal rod immersed in water corrodes at the bottom due to oxygen depletion at the top and oxygen availability at the bottom; 2) Factors that affect corrosion include moisture, oxygen, and temperature; 3) Wet corrosion requires both a metal surface and an electrolyte like water; 4) A copper equipment should not have a steel bolt to avoid galvanic corrosion between dissimilar metals; 5) Zinc and aluminum can provide cathodic protection to iron; 6) Wire mesh corrodes faster at joints due to the formation of microcells; and 7) Sacrificial anodes are used to control corrosion by corroding instead of protected metal surfaces.

1. Corrosion tutorial
1. A pure metal rod half immersed vertically in water starts corroding at the bottom. Give reason.
2. What are the factors which affect corrosion?
3. State two conditions for wet corrosion to take place.
4. A copper equipment should not possess a small steel bolt. Give reason.
5. Which of the following metals could provide cathodic protection to iron : Al, Zn, Ni, Cu
6. Wire mesh corrodes faster at the joints. Why?
7. Explain the nature of different types of oxide layers formed on the metal surface in oxidation
corrosion.
8. What is a sacrificial anode? Mention its role in corrosion control.