In what condition do polyphosphate films lose their effectiveness?

Polyphosphate films are used in various water treatment processes, primarily for the inhibition of scale formation and corrosion. These films can lose their effectiveness when exposed to high temperatures, particularly above 120°F. At elevated temperatures, the stability of polyphosphate compounds is compromised. They tend to hydrolyze, leading to a breakdown of their molecular structure and a reduction in their protective properties.

In such conditions, the continued presence of polyphosphates in the water may not effectively prevent scale due to this degradation. Maintaining the water temperature below this threshold is crucial to ensure that the polyphosphate films can function properly and protect against corrosion and scale formation.

Understanding the temperature limits for polyphosphate functionality is essential for those involved in water treatment, ensuring that effective methods are employed for maintaining water quality under varying environmental conditions.