What does under-deposit corrosion develop from?

Under-deposit corrosion develops from the accumulation of deposits on metal surfaces, particularly in environments where contaminants can settle. This occurs when particulates, such as scale, silt, or biological material, affect the protective oxide layer on the metal. When deposits form on a surface, they can create localized areas where moisture or corrosive agents can become trapped underneath. This environment becomes less oxygenated and can lead to differential aeration cells, promoting corrosion in those localized areas while the surrounding metal remains relatively unaffected.

In systems like water treatment, steam generation, or in industrial processing, the deposition of materials—whether from minerals, sediment, or biological growth—can lead to significant corrosion problems if not properly managed. Regular monitoring and maintenance are essential to minimize the risk of under-deposit corrosion and protect the integrity of metal components in various applications.