Which two common forms of corrosion are typically encountered on ships?

Galvanic corrosion and pitting corrosion are two of the most common forms encountered on ships due to the marine environment in which they operate.

Galvanic corrosion occurs when two dissimilar metals are electrically connected in the presence of an electrolyte, often salt water. This type of corrosion relies on the electrochemical potential difference between the metals, leading to accelerated deterioration of the less noble metal. This is a significant concern on ships, where various metals are used in construction and components, and can lead to serious structural issues if not managed properly.

Pitting corrosion is characterized by localized, small holes or 'pits' forming in the material, typically due to the presence of chlorides found in seawater. It is particularly damaging because it can go unnoticed until a significant amount of metal has been lost, compromising the integrity of the ship. Pitting is exacerbated by factors such as stagnant water, temperature variations, and the presence of other corrosive agents, making it a prevalent concern in marine environments.

These two forms of corrosion are significant in maritime operations, addressing them through proper materials selection and maintenance practices is crucial to prolonging the lifespan of the ship and ensuring operational safety.