Nalco 3688 Here

| Feature | Nalco 3688 | Traditional Chromate | Molybdate/Nitrite | All-Organic (no PO4) | |---------|------------|----------------------|-------------------|------------------------| | Corrosion control (mild steel) | Good (1-3 mpy) | Excellent (<0.5 mpy) | Excellent | Fair | | Yellow metal protection | Yes (azole) | No (requires additive) | Often lacks | Yes (if formulated) | | Scale inhibition | Excellent | Poor | Moderate | Very good | | Environmental compliance (P limits) | Moderate (P discharge) | Banned in many regions | Good (Low P) | Best (No P) | | Cost | Medium | Low (but illegal) | High | Medium-High |