What type of corrosion is caused by the contamination of boiler water with shore water?

The type of corrosion caused by the contamination of boiler water with shore water is caustic corrosion. This occurs because shore water often contains constituents such as chlorides and other impurities that can increase the alkalinity of the boiler water. When these contaminants are present, they can lead to aggressive attack on the metal surfaces, particularly in high-temperature environments typically found in boilers. The elevated pH levels associated with caustic conditions can result in the dissolution of protective oxide films on the metal, thereby initiating corrosion.

Caustic corrosion is particularly problematic in systems that handle water under high pressure and temperature, as these conditions can exacerbate the corrosion rate. Understanding the impact of different water sources and their chemical compositions on the integrity of boiler systems is crucial for proper maintenance and operation.

The other types of corrosion mentioned, such as pitting, galvanic, and fatigue corrosion, pertain to different mechanisms and circumstances. Pitting corrosion is localized and results in small holes on the surface, while galvanic corrosion occurs due to electrical differences between dissimilar metals in contact. Fatigue corrosion relates to the degradation of materials under cyclic loading. Each type has unique causes and effects, which are distinct from the chemical implications brought about by the introduction of contaminated shore water into a