HEDP (Hydroxyethylidene Diphosphonic Acid) is a kind of organic phosphonic acid.
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HEDP (Hydroxyethylidene Diphosphonic Acid) is an odourless organic phosphorus chemical compound. For one thing, it is colourless to yellowish acidic liquid Moreover, HEDP is an organic phosphonic acid corrosion inhibitor. HEDP acid is used in various industrial applications. Such as industrial water treatment corrosion inhibitor and detergents. It further shows good stability in presence of chlorine. The same good as corrosion inhibition properties in presence of zinc and other phosphates.
Another key point, HEDP can dissolve the oxidized materials on these metals’ surfaces. It shows excellent scale and corrosion inhibition effects under temperature 250℃. Hydroxyethylidene diphosphonic acid has good chemical stability at high pH value. For this reason, it hard to be hydrolyzed and decomposed under ordinary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance are better than that of other organic phosphonic acids (salt).
The solid state of Hydroxyethylidene Diphosphonic Acid is crystal powder. Because of its high purity, HEDP is suitable for usage in winter and freezing districts. Solid state HEDP can be used as a cleaning agent in electronic fields and as additives in daily chemicals. (There are too many impurities in the liquid, so it can’t be used for electronic cleaning and daily use.)
HEDP can chelate with Fe, Cu, and Zn ions to form stable chelating compounds. In other words, HEDP acid can react with metal ions in the water system to form a hexa-element chelating complex, with calcium ion in particular. Therefore, HEDP has good antiscale and visible threshold effects. When built together with other water treatment chemicals, HEDP shows good synergistic effects. Hydroxyethylidene diphosphonic acid can be also used as chelating agent in the textile industry.