Aluminium Boat Corrosion Repair: What to Look For
Updated: Sep 8
If you own an aluminium boat, you’ll know they’re pretty tough. They handle New Zealand conditions well and, with a bit of regular care and maintenance, can give you years of use.
But aluminium boats aren’t completely corrosion proof.
Saltwater, moisture, different metals and poor drainage can all contribute to aluminium boat corrosion over time. The good news is that regular aluminium boat maintenance can help prevent problems and pick up any issues before they turn into bigger repairs.
What’s Aluminium Boat Corrosion?
There are a few common causes of Aluminium Boat Corrosion, and most can be managed with some regular maintenance.
Water and Salt Exposure
Saltwater is great for fishing. Not so great when it’s left sitting around your boat.
Salt and moisture can build up in corners, around fittings, underneath flooring and inside compartments. If water has nowhere to drain or dry out, corrosion can start to develop.
Giving your boat a good freshwater rinse after being in saltwater is one of the easiest ways to help prevent corrosion.
Oxidation
Different metals coming into contact
Aluminium doesn't always get along with other metals.
Fittings, bolts, brackets and other components made from different metals can contribute to galvanic corrosion when they are in contact with aluminium and moisture or saltwater is present.
This is why using the right materials and correct installation is important when adding fittings or accessories to an alloy boat.
Electrical problems
Electrical systems can also contribute to corrosion on an aluminium boat.
If you're seeing unexplained corrosion around batteries, wiring, electrical connections or other equipment, it's worth getting it checked rather than simply cleaning it up and carrying on.
Water sitting where it shouldn't
This is one we see fairly regularly with boat repairs.
Water that gets trapped inside compartments, under flooring or around fittings can sit there for a long time without being noticed.
Keeping drainage holes clear and allowing areas of the boat to dry properly can make a big difference to preventing corrosion.
What does aluminium boat corrosion look like?
Not all corrosion looks the same, but there are a few things worth keeping an eye out for as part of your regular aluminium boat maintenance.
Look for:
• White or powdery deposits on the aluminium
• Pitting or small holes forming in the surface
• Discolouration around fittings or bolts
• Corrosion around brackets or other metal components
• Cracks or damage around welds
• Water sitting where it shouldn't
• Leaks or areas that look thinner or weaker than they should
A bit of surface discolouration doesn't necessarily mean you've got a major problem.
Pitting, recurring corrosion or corrosion that is getting worse is worth having a closer look at.
Need Advice?
If you're not sure whether what you're seeing is corrosion or something that needs repairing, get in touch with Fusion Fabrication.
We work with aluminium boats throughout the Bay of Plenty and Coromandel, from aluminium welding and repairs through to marine fabrication.
Disclaimer: The advice and information provided in this blog are intended for general guidance only. While we strive to offer accurate and helpful insights, we recommend conducting further research and consulting relevant experts or manuals. Fusion Fabrication holds no responsibility for any actions taken based on the content of this blog. Always follow the specific recommendations provided in your owner’s manuals and professional advice.
