Coated Cu-Al Coils vs Copper-Fin Coils
Coated Cu-Al coil vs copper-fin coil
| Coated Cu-Al coil | Copper-fin coil | |
|---|---|---|
| Galvanic couple | Present, isolated by the coating. | Removed — tube and fin are both copper. |
| Weight and cost | Standard. | Heavier and more expensive. |
| Sulphide and ammonia sites | Needs a chemical-resistant film. | Copper is attacked; coating still needed. |
| Supply | Standard coil from most manufacturers, coated afterwards. | Special order from fewer manufacturers. |
| Damage tolerance | Scratches expose both metals. | No galvanic acceleration at damage. |
Choose coated cu-al coil if…
- Coastal sites (C4–C5) without sulphide or ammonia
- Equipment bought as standard units
- Weight and budget matter
Choose copper-fin coil if…
- Very severe marine exposure where the owner specifies copper fins
- Sites where coating damage is likely and hard to repair
- The manufacturer offers copper fins as a standard option
Cost and lead time
Copper-fin coils are a special order for most unit manufacturers, with longer lead times and higher cost. A coated Cu-Al coil uses the standard coil and adds a coating step. At wastewater plants and near ammonia sources, copper fins do not remove the need for coating, so their extra cost buys less.
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