Protecting Marine Chillers from Galvanic Corrosion
Onboard chillers are essential for climate control on yachts and pleasure boats. However, these systems face a silent yet dangerous threat: galvanic currents, which can seriously damage metal seawater heat exchangers.
What are galvanic currents?
Galvanic currents occur when two dissimilar metals are connected through an electrolyte such as seawater, causing a potential difference that leads to corrosion. This can result in severe damage to copper-nickel, stainless steel, or bronze heat exchangers.
Why protect chillers from galvanic currents?
- System blockages
- Refrigerant or seawater leaks
- Expensive replacements
- Service interruptions
Important warranty conditions
- Installed as per manufacturer’s guidelines
- Presence of properly installed sacrificial anodes (zincs)
- Connection to the onboard grounding system
Anode maintenance is essential: replacement intervals depend on water type, onboard metals, stray currents, and the environment. Lack of maintenance can void the warranty.
Protection solutions
1. Sacrificial anodes
2. Galvanic isolators
3. Isolation transformers
Best practices
- Inspect anodes regularly
- Check for stray currents
- Clean heat exchangers
- Hire specialized technicians
Rely on Top Yacht
Top Yacht offers professional installation and maintenance for marine chillers. Learn more at topyacht.it.
