详情
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 |
|
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.
