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1.  SC-201 (ZF111SC) 1-Hydroxy ethylene-1.1-diphosphonic acid (HEDPA)

Issuing time:1998-10-09 19:54

organic phosphonic acid is a kind of cathodic corrosion inhibitor which

organic phosphonic acid a is kind of cathodic corrosion inhibitor which has the best corrosion inhibition when the dosage is above 30ppm. It can also be used as scale inhibitor when it is in low concentration. It has obvious threshold-effects. When it is used with other water treatment agents, it shows ideal cooperativity. It shows excellent chelating ability to many metal ions such as Ca2+, Mg2+,Cu2+,Zn2+, etc. so it is a main product in scale and corrosion inhibitor all around the world.

(1) Mol.wt. Formula:

206.03, C2H8O7P2

(2) it is miscible with water. It is nontoxic and stable in high PH. It shows excellent corrosion inhibition when it is lower than 200℃, because complex would be formed with metal ions such as Fe3+,Cu2+,Al3+,Zn2+,etc. and it can also dissolve the oxide on the surface.


Scale and corrosion inhibitor of boiler and heat exchanger, complexing agent of non-cyanide plating, cleaning agent of metal and nonmetal.



Colorless or light yellow liquid

The content of HEDPA


The content of phosphorous acid(by PO3-3)


The content of phosphoric acid(by PO3-4)


The content of chloride(by Cl-)






Chelating value (mgCaCO3/g)


(5)packing and storage:

Packed in 25kg plastic bucket. It can be stored for 2 years.

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