WATER TREATMENT COMPOSITION FOR PREVENTING SCALE AND CORROSION IN ENCLOSED CIRCULATION COOLING SYSTEM

摘要

PURPOSE: A water treatment composition for preventing scale deposition on pipes and corrosion of metal pipes in enclosed circulation cooling system is provided. CONSTITUTION: The water treatment composition comprises 0.1 to 50 wt.% of sodium nitrite or potassium nitrite; 0.1 to 40.0 wt.% of one or more phosphonate compounds selected from the group consisting of phosphonobutane tricarboxylic acid, hydroxyethylidine diphosphonic acid, hydroxyphosphono carboxylic acid and amino trimethylene phosphonic acid; 0.1 to 20.0 wt.% of azole compounds selected from the group consisting of tolyltriazole, mercapto benzothiazole and benzotriazole; and a balance of water.