Hydroxyphosphonoacetic acid solution (50% aqueous)
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Molecular formula
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Chemical Product Description & Applications
Hydroxyphosphonoacetic acid combines phosphonic-acid, hydroxyl and carboxylic-acid functionality in one molecule. It is used in industrial-water formulations for corrosion inhibition and metal-ion complexation. Interaction with metal-containing surfaces and compatible inhibitor components supports protective-film development in suitable cooling-water programs.
The selected material is an approximately 50% aqueous concentrate for further formulation. HPAA is particularly associated with corrosion-control packages and is often used with zinc salts or other complementary ingredients. This emphasis distinguishes it from additives selected mainly as stand-alone scale inhibitors. Its contribution depends on the balance of water chemistry, pH and the other treatment components, with dispersants or scale-control ingredients added for those separate tasks.
Typical Applications
- Cooling-water corrosion-inhibitor packages: Used as an organic component in formulated programs intended to protect water-contact metal equipment from corrosion.
- Zinc-containing treatment blends: Used in compatible formulations where HPAA and zinc-based components work together in the corrosion-control system.
Specifications
| Parameter | Specification | Test Method |
|---|---|---|
| Appearance | Colorless to pale yellow liquid | Visual inspection |
| Identification | Active-component fingerprint matches reference | Chromatographic or spectroscopic reference comparison |
| Active acid | 48.0-52.0% w/w | Calibrated 31P NMR with internal standard |
| pH, 1% aqueous dilution at 25 C | 2.0-3.0 | Calibrated pH meter |
| Phosphorous acid | ≤2.0% w/w | Ion chromatography |
| Iron | ≤10 mg/kg | ICP-OES |
Specifications describe the standard grade. Tolerance, test method and documentation package are confirmed per order.
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