| 摘要 |
Disclosed is a method of conditioning water, particularly flowing or circulating water streams (e.g., as used in cooling water systems), to reduce the corrosive attack and/or scale accumulation on metal surfaces which the water contacts. The method includes introducing into the water a water soluble cationic polymer and a polyphosphate. The cationic polymer is a polyamide containing quaternary ammonium groups or a polyureylene containing quaternary ammonium groups. The polyphosphate is an inorganic polyphosphate or a polyfunctional acid phosphate ester of a polyhydric alcohol (i.e., a phosphorylated polyol). The cationic polymers synergistically increase the effectiveness of the polyphosphate as corrosion and scale inhibitors in certain waters. A typical inorganic polyphosphate is sodium tripolyphosphate. A typical phosphorylated polyol is phosphorylated pentaerythritol. |
