## Common ground
All options are types of sacrificial anodes used to protect metal structures from corrosion through galvanic protection.
## Options at a glance
**7616.99 – Aluminium sacrificial anodes**
- **Defining trait:** Made from aluminium or aluminium alloys, offering high capacity and lightweight performance.
- **Typical examples:** Marine hulls, offshore platforms, seawater pipelines.
- **Best fit when:** Used in seawater or brackish water where long service life and low weight are important.
**7907.00 – Zinc sacrificial anodes**
- **Defining trait:** Made from zinc or zinc alloys, known for consistent voltage output and reliability in seawater.
- **Typical examples:** Ship hulls, underwater tanks, dock fittings.
- **Best fit when:** Required in seawater applications where stable potential and proven performance are critical.
## Key differences
| Feature | 7616.99 (Aluminium) | 7907.00 (Zinc) |
|-----------------------|----------------------------|----------------------------|
| Material | Aluminium alloy | Zinc or zinc alloy |
| Weight | Lighter | Heavier |
| Capacity | Higher (longer life) | Moderate |
| Voltage output | Slightly lower | More stable and consistent |
## How to choose
- Is the application in seawater or brackish water? → Yes → Continue.
- Does weight or long service life matter more? → Yes → 7616.99.
- Is consistent, reliable performance the top priority? → Yes → 7907.00.
## Overlaps & pitfalls
Both types are used in marine environments and can protect similar structures. The choice often depends on environment and design needs. No clear priority is given—select based on the product’s main function: use aluminium for high capacity/lightweight, zinc for proven stability