Which boiler water property is controlled to minimize corrosion?

Prepare for the Engineman EN A School Test 1. Utilize flashcards and multiple choice questions with detailed explanations to boost confidence and readiness for the test.

Keeping boiler water alkaline is how corrosion is minimized. Alkalinity, reflected in the water’s pH, acts as a buffer that neutralizes acidic species such as carbonic acid formed from dissolved CO2. When the water is alkaline, a protective oxide layer forms on metal surfaces and the rate of metal dissolution drops, reducing corrosion. Operators maintain a target alkaline range through proper feedwater treatment and alkali addition to keep the pH in the recommended zone. The other factors aren’t the primary control for corrosion: color relates to impurities and isn’t a direct corrosion control, total dissolved solids mainly affect scaling, and dissolved oxygen is a corrosion driver that is managed separately through deaeration and oxygen scavengers.