What is a potential risk associated with excessive use of chelates in boiler treatment?

The correct answer highlights a significant concern regarding the use of chelates in boiler treatment. Excessive use of chelates can lead to the loss of protective layers on metal components within the boiler system.

Chelating agents are designed to bind with metal ions, helping to prevent issues such as scale formation and corrosion by keeping these metals in a soluble state. However, when used in excessive amounts, these agents can interfere with the natural protective oxides that develop on metal surfaces. This loss of these protective layers can expose the underlying metal to direct contact with the boiler water, which may lead to increased corrosion rates and structural integrity issues over time.

This risk emphasizes the necessity for careful control and monitoring of chemical treatments in boiler operation, ensuring that the benefits of chelates does not come at the expense of the materials' durability and lifespan. In practical applications, maintaining the balance of chemical additives is critical for ensuring efficient boiler operation and longevity of the equipment.