1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)

• HEDP（羟基乙叉二膦酸）是一种有机膦酸类阻垢缓蚀剂，能与铁、铜、锌等多种金属离子形成稳定的络合物，能溶解金属表面的氧化物。在250℃下仍能起到良好的缓蚀阻垢作用，在高pH下仍很稳定，不易水解，一般光热条件下不易分解。耐酸碱性、耐氯氧化性能较其它有机膦酸(盐)好。可与水中金属离子，尤其是钙离子形成六圆环螯合物，因而具较好的阻垢效果并具明显的溶限效应，当和其它水处理剂复合使用时，表现出理想的协同效应。

• HEDP固体属于高纯产品，适用于冬季严寒地区；特别适用于电子行业的清洗剂和日用化学品添加剂。

• HEDP广泛应用于电力、化工、冶金、化肥等工业循环冷却水系统及中、低压锅炉、油田注水及输油管线的阻垢和缓蚀；在轻纺工业中，可以作金属和非金属的清洗剂，漂染工业的过氧化物稳定剂和固色剂，无氰电镀工业的络合剂，医药行业作放射性元素的携带剂。

HEDP is an organophosphonate corrosion inhibitor. HEDP shows multifunctional properties that includes scale inhibition and corrosion inhibition. HEDP is noted for excellent CaCO3 inhibitor and water hardness stabilizer. HEDP is very good complexing agent for metal ions like Fe, Cu, and Zn.

HEDP can react with metal ions in water system to form hexa-element chelating complex, with calcium ion in particular. When built together with other water treatment chemicals, HEDP shows good synergistic effects. HEDP shows excellent stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions. HEDP shows excellent scale and corrosion inhibition effects under temperature 250℃. HEDP acid/alkali and chlorine oxidation tolerance are better than that of other organophosphonate (salts)kairuiwater.com.