Description
HEDP is an organophosphoric acid
corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions to
form stable chelating compounds.It can dissolve the oxidized
materials on these metals’ surfaces.
HEDP shows excellent scale and corrosion
inhibition effects under temperature **0?.
HEDP has good chemical stability under
high pH value, hard to be hydrolyzed, and hard to be decomposed
under ordinary light and heat conditions. Its acid/alkali and
chlorine oxidation tolerance are better than that of other
organophosphoric acids (salt).
HEDP can
react with metal ions in water system to form 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, it shows good
synergistic effects.
The solid state of HEDP is crystal powder, suitable for usage in
winter and freezing districts. Because of its high purity, it can
be used as cleaning agent in electronic fields and as additives in
daily chemicals. Specification:
| Items |
Index |
| Appearance |
Clear, Colorless to pale yellow
aqueous solution |
White crystal powder |
| Active content (HEDP)% |
*8.***2.0 |
*0.0 min |
| Active content (HEDP·H2O)% |
- |
*8.0 min |
| Phosphorous acid (as PO3*-)% |
1.0 max |
0.8 max |
| Phosphoric acid (asPO4*- )% |
0.6 max |
0.5 max |
| Chloride (as Cl-) ppm |
**0.0 max |
**0.0max |
| pH (1% solution) |
2.0 max |
2.0 max |
| Density (*0?)g/cm3 |
1.***1.*7 |
- |
| Fe?mg/L |
*0.0 max |
5.0 max |
| Colour APHA (Hazen) |
*0.0 max |
- |
| Acetic acid % |
0.5 max |
 |
| Ca sequestration (mg CaCO3/g) |
**0.0 min |
 |
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Usage:
HEDP is used as scale and
corrosion inhibition in circulating cool water system, oil field
and low-pressure boilers in fields such as electric power, chemical
industry, metallurgy, fertilizer, etc.. In light woven industry,
HEDP is used as detergent for metal and
nonmetal. In dyeing industry, HEDP is used as peroxide stabilizer
and dye-fixing agent; In non-cyanide electroplating,
HEDP is used as chelating agent. The
dosage of ***0mg/L is preferred as scale inhibitor, ****0mg/L as
corrosion inhibitor, and ********0mg/L as detergent. Usually, HEDP
is used together with polycarboxylic acid.Â
