Corrosion Process Corrosion mitigation in boiler plant (Part -2)

摘要

Boilers are large and expensive installations which can suffer enormously from damage caused by corrosion mainly and erosion, aggravated further by high temperatures. The exact type of damage experienced varies from one part of a boiler to another and is influenced by the feed water, combustible fuel and boiler design. The most common causes of corrosion are dissolved gases (primarily oxygen and carbon dioxide), under-deposit attack, low pH, and attack of areas weakened by mechanical stress, leading to stress and fatigue cracking. The corrosion can be mitigated by taking some precaution: treating the feedwater to coating the metal surface.