1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) is a high-efficiency organophosphoric acid corrosion inhibitor renowned for its superior ability to chelate metal ions such as Iron (Fe), Copper (Cu), and Zinc (Zn). By forming stable chelating compounds, HEDP effectively dissolves oxidized materials from metal surfaces, ensuring optimal system cleanliness and operational efficiency in demanding industrial environments.
Engineered for extreme conditions, HEDP maintains exceptional stability and performance at temperatures up to 250°C and exhibits high tolerance to alkaline environments and chlorine oxidation. Whether in liquid or crystal powder form, it provides a versatile solution for scale inhibition and corrosion protection, making it an essential additive for water treatment, electronics cleaning, and textile processing.
Detailed Parameters
| CAS No. | 2809-21-4 | Molecular Formula | C2H8O7P2 |
|---|---|---|---|
| Molecular Weight | 206.02 | Appearance (Solid) | White crystal powder |
| Active Content (Solid) | 90.0% min | Active Content (Liquid) | 58-62% |
| Phosphorous Acid | 0.8% max (Solid) / 2.0% max (Liquid) | Phosphoric Acid | 0.5% max (Solid) / 0.8% max (Liquid) |
| pH (1% solution) | 2.0 max | Ca Sequestration | 500.0 mg CaCO3/g min |
Key Advantages
High Thermal Stability
Maintains excellent scale and corrosion inhibition effects even under high-temperature conditions up to 250°C.
Chemical Durability
Highly resistant to hydrolysis and decomposition under ordinary light, heat, and high pH environments.
Powerful Chelation
Forms hexa-element chelating complexes with calcium and other metal ions to prevent scale buildup.
Oxidation Tolerance
Superior tolerance to chlorine oxidation and acid/alkali fluctuations compared to other organophosphoric acids.
High Purity Grade
Available in high-purity forms suitable for precision cleaning in electronic fields and daily chemical additives.
Synergistic Effect
Works seamlessly with polycarboxylic acids to amplify water treatment and corrosion protection efficiency.
Product Gallery
Management Platforms
Industrial Water Cooling
Ideal for circulating cool water systems in power plants and metallurgy.
Oilfield Applications
Effective for scale control in oil extraction and injection water systems.
Textile & Dyeing
Functions as a peroxide stabilizer and dye-fixing agent in fabric processing.
Electroplating
Used as a high-performance chelating agent in non-cyanide electroplating baths.
Boiler Maintenance
Optimized for low-pressure boilers across the chemical and fertilizer industries.
Precision Cleaning
High-purity powder used as a cleaning agent for electronic components.
Investment Return Comparison
| Application Mode | Standard Dosage | Expected Benefit |
|---|---|---|
| Scale Inhibition | 1-10 mg/L | Minimized Calcium Deposit |
| Corrosion Inhibition | 10-50 mg/L | Extended Pipe Lifespan |
| Industrial Cleaning | 1000-2000 mg/L | Removal of Metal Oxides |
| Textile Processing | Custom Dosage | Improved Dye Fixation |
| Combined with Polycarboxylic | Synergistic Ratio | Maximum System Efficiency |
Frequently Asked Questions
HEDP acts as a powerful scale and corrosion inhibitor. It chelates metal ions (like Ca, Fe, Zn) to prevent the formation of scale and protects metal surfaces from oxidative corrosion.
Yes, HEDP is specifically designed for high-temperature stability and maintains its inhibitory effects at temperatures up to 250°C.
HEDP offers superior chemical stability under high pH values and has a better tolerance to chlorine oxidation and acid/alkali changes than most other organophosphoric acids.
HEDP should be stored in a cool, dry, and shady place. It has a shelf life of twelve months when stored under these conditions.
Yes, HEDP is frequently used in combination with polycarboxylic acids to achieve a synergistic effect, enhancing both scale and corrosion inhibition.
HEDP is acidic. Operators should use proper labor protection, avoid contact with skin and eyes, and rinse immediately with plenty of water if exposure occurs.
