HEDP Na2 is organic phosphonic acid corrosion inhibitor. It has two appearances, colourless to pale yellow transparent liquid and white powder. White powder HEDP Na2 (Etidronate Disodium), its melting point is 198°C – 199°C. It is soluble in water and ethanol and has strong moisture absorption.
HEDP Na2 has good scale and corrosion inhibition effects even under 250℃. It can dissolve the oxidized materials. HEDP Na2 is stable at high pH value. It is not easy to be hydrolyzed and to be decomposed under normal light and heat condition. HEDP Na2 acid/alkaline and chloride oxidation tolerance are better than that of other organic phosphonic acids.
HEDP Na2 can form six-ring chelating compounds with metal ions in a water system, Ca2+ in particular. This product also has good obvious dissolution threshold effects. When used with other water treatment agents, its synergistic effects are better.
HEDP Na2 is known in the market as an organo-phosphonic acid corrosion inhibitor. HEDP Na2 can chelate with Fe, Cu, and Zn ions. HEDP Na2 (Etidronate Disodium) with chelation value 270 is a good substitute for EDTA disodium powder.