Metals in Seawater - Galvanic Series
Galvanic series of metals in seawater at 25°C (77°F). The list is ordered from most noble (top) to most active (bottom), helping predict galvanic corrosion behavior when different metals are in contact in seawater.
Galvanic Series in Seawater at 25°C (77°F)
The galvanic series ranks metals and alloys based on their electrode potential in seawater. Metals higher in the series (more noble) will be protected, while metals lower in the series (more active) will be sacrificed in galvanic corrosion.
Key Principles:
- Metals closer together in the series have less galvanic potential difference
- Larger separation in the series indicates greater galvanic corrosion risk
- The position of metals can change based on whether they are in passive or active state
Galvanic Corrosion Prevention Tips
- Avoid dissimilar metals: Use metals close together in the galvanic series
- Isolate metals: Use non-conductive materials between different metals
- Use cathodic protection: For important structures, use sacrificial anodes or impressed current systems
- Apply coatings: Paint or other protective coatings can reduce galvanic effects
- Control electrolyte: Reduce salinity and increase pH when possible
- Consider surface area: Minimize the cathode/anode area ratio to reduce current flow