What are two common types of corrosion that impact boilers?

Pitting corrosion and galvanic corrosion are indeed two significant types of corrosion that can affect boilers.

Pitting corrosion occurs when small, localized areas on the metal surface become more anodic, leading to the formation of tiny pits that penetrate through the material. This type of corrosion is particularly dangerous because it can go unnoticed until significant damage has occurred since the overall surface may still look intact. In boilers, pitting can lead to leaks and structural failure if not monitored and controlled.

Galvanic corrosion happens when two different metals are in electrical contact in the presence of an electrolyte, causing one metal to corrode preferentially. In boiler systems where dissimilar metals are used for components—like carbon steel and stainless steel—this form of corrosion can lead to rapid deterioration of the less noble metal. Understanding and mitigating galvanic corrosion is crucial for the longevity and safety of boiler systems.

Recognizing these two forms of corrosion is essential for boiler maintenance practices, as they present unique challenges that require specific strategies to prevent and address effectively.