ATMP often associated with other organic acid, poly- carboxylic acid or salt to form organic alkaline water treatment agent, for circulating cooling water systems under a variety of different water quality conditions. Dosage of 1 ~ 20mg / L is preferred ; used as corrosion inhibitor , in an amount of 20 ~ 60mg / L. [1] ATMP acid products generally . However, when used in caustic and other purposes, with sodium hydroxide and after a five alternate salt are formulated . Since the lower and the disodium salt of phosphonic acid trisodium salt solubility in water ( at room temperature of about 30% , and about 50% pentasodium salt ) , for the preparation of a stable formulation with sodium hydroxide solution and the
When the liquid product (50 % solution in water ) , the former is not higher than 45% concentration , otherwise the process will occur and the disodium and trisodium salts fine microcrystalline precipitate. When using this product as a corrosion inhibitor alone , the required dose is higher. So often required with other inhibitors ( eg , zinc ion ) combined. And with zinc , can significantly improve the corrosion resistance of carbon steel , the best zinc content in the formulation is 30% -60 % . Since the formation of complexes with zinc , zinc solubilizing stable , so that the formulation is not sensitive to changes in water quality , cooling water temperature allowed to reach 70-77 ° C , PH value to 9
