Corrosion is the deterioration of materials through chemical reactions with the environment. It refers mainly to metals but can also affect other materials like plastics and concrete. Corrosion can have serious economic and safety consequences by reducing strength, causing equipment downtime, and loss of surface properties. It can lead to failures and expensive replacements even when only a small amount of metal is destroyed. Underground pipes and electronic components are especially vulnerable. The effects of corrosion are influenced by factors like water flow, exposure to sea water, contact between dissimilar metals, and lack of protective coatings.

2. Anodic & Cathodic Reactions

19. Corrosion prevention