Organic phosphonate liquid series corrosion inhibition

Ethylene Diamine Tetra (Methylene Phosphonic Acid) Sodium



CAS NO.1429-50-1

Molecular Formula: C6H12O12N2P4Na8C                Molecular weight: 612.13


EDTMPS is nitrogenous organic polyphosphonic acid, a part of cathodic corrosion inhibitor. Its corrosion inhibition is 3~5 times better than that of inorganic polyphosphate. It is miscible with water, innocuous and none pollution to environment, has good chemical stability and temperature tolerance. It shows excellent scale inhibition ability under temperature 200℃. It can dissociate into 8 positive-negative ions, thus can chelate with many metal ions to form polymer reticulation complex, to destroy the normal crystallization of calcium scale. EDTMPS shows better antiscale effects to calcium sulfate and barium.





Clear yellow to umber transparent liquid

Active component (as EDTMPS)%


Organic phosphonic acid(asPO43- )%


Phosphorous acid (as PO33-)%


Phosphoric acid (asPO43- )%


pH (1% water solution)

9.5 -10.5

Density (20) g/cm3


Chloride (as Cl-)%


Application range&using method

EDTMPS can be used as corrosion inhibitor in circulating cool water system and boiler water. It is a chelating agent in non-cyanogen electroplating industry and a water-softening agent in printing & dyeing industry. When used alone, 2~10mg/L is preferred. When built with HPMA by ratio ETDMP:HPMA=1:3, it can be used for low pressure boiler. It can also be built with BTA, PAAS and zinc salt.  Organic phosphonic acid

Package and Storage:

Normally EDTMPS packed with 25kg net Plastic Drum, or packed as customer’s required. Storage for ten months in room shady and dry place.