Sodium Molybdate Closed-Loop Corrosion Inhibitor
CAS Number: 7631-95-0
Sodium molybdate (Na2MoO4) is a non-toxic, chromate-free anodic corrosion inhibitor formulated for closed-loop cooling, heating, and glycol-based water systems where low toxicity is required. It passivates mild steel surfaces through the formation of an iron-molybdate complex film and is favored in food processing, pharmaceutical, and HVAC applications where chromate or nitrite are prohibited.
Technical Specifications
| appearance | White crystalline powder |
| Na2MoO4 content | ≥99.0% (anhydrous basis) |
| moisture content | ≤0.5% |
| pH 5pct solution | 8.5–10.0 |
| heavy metals as Pb | ≤0.001% |
| solubility water 20C | ≥56 g/100 mL |
Applications
- Closed-loop chilled and heating water systems in buildings
- HVAC building services water treatment programs
- Solar thermal heating circuit inhibition
- Food processing and pharmaceutical cooling circuits
- Glycol antifreeze and heat transfer fluid corrosion protection
Key Features
- Non-toxic, chromate-free — accepted in food, pharma, and potable water-adjacent systems
- Effective mild steel passivation at concentrations of 50–200 mg/L as MoO4
- Synergistic with azoles (BZT, TTA) for comprehensive copper alloy protection
- Stable in glycol-water blends and effective across wide temperature range
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