HEDP·Na2 is a disodium salt of hydroxy ethylidene diphosphonic acid. It is an organophosphonic acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions. HEDP·Na2 can dissolve the oxidized materials. This HEDP disodium has good scale and corrosion inhibition effects even under 250℃.
HEDP·Na2 is stable under high pH value, not easy to be hydrolyzed, not easy to be decomposed under normal light and heat conditions. Its acid/alkaline and chloride oxidation tolerance are better than that of other organophosphonic acids. HEDP·Na2 can form six-ring chelating compounds with metal ions in water systems, Ca2+ in particular. HEDP·Na2 has good scale inhibition effects and obvious dissolution threshold effects. When used with other water treatment agents, the synergistic effects are better.
|Appearance||Colorless to yellowish transparent liquid||White powder|
|Active content (HEDP), %||16.5 Min.||74.0-79.0|
|Active content (HEDP·Na2), %||20.0 Min.||89.8 Min.|
|pH (1% water solution)||4.0-6.0||4.0-6.0|
|Density (20℃), g/cm3||1.12-1.22||—|
|Phosphorous acid (PO33-), %||—||3 Max.|
|Fe, mg/L||—||35 Max.|
HEDP·Na2 is widely used in circulating cool water systems, medium and low-pressure boiler, oil field water pipelines as scale and corrosion inhibitor in fields such as electric power, chemical industry, metallurgy, fertilizer, etc. In the light woven industry, HEDP·Na2 is used as a detergent for metal and nonmetal. In the dyeing industry, hydroxy ethylidene diphosphonic disodium is used as a peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP·Na2 is used as a chelating agent.
Liquid: 200L plastic drum, IBC(1000L), customers’ requirement. Storage for ten months in shady room and dry place.
Solid: 25kg/bag, customers’ requirement. Storage for ten months in shady room and dry place.
Weak acidity, Avoid contact with eye and skin. Once contacted, flush with water.
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