Which condition can lead to increased boiler corrosion?

Low pH levels in boiler water can lead to increased corrosion due to the acidic environment they create. When the pH level drops below the optimal range (which is typically between 10 and 12 for most boiler systems), the protective oxide layer that forms on metal surfaces can be compromised. This leads to direct contact of the metal with corrosive elements, such as oxygen and dissolved minerals in the water. As a result, corrosion rates may accelerate, leading to potential failure and reduced lifespan of boiler components.

On the other hand, high alkalinity is generally associated with better corrosion protection, as it helps to keep the pH levels elevated, thereby promoting the formation of a protective layer. Stable temperatures do not contribute to corrosion; in fact, they help maintain consistent operating conditions that can prevent corrosion-related issues. Lastly, excess steam, while it can cause other operational concerns, does not directly lead to increased corrosion in the same way that low pH levels do.