For anyone working with marine electronics PCBs, the sea brings more than just moisture; it brings a lot of problems.
Salt spray, humidity, and water splashes all pose real threats to open circuits. So, do maritime PCBs need to be waterproof? Of course; very. And waterproof maritime PCBs are not only useful, they are essential.
In this article, we’ll look at why water and salt cause damage, how to prevent it, and what goes into intelligent PCB design for marine environments.
Environmental Challenges of Marine Electronics
What makes the ocean a difficult place for electronic devices to survive?
For starters, there’s humidity, not just damp air, but the constant presence of moisture sneaking into unprotected components. Then you get salt spray, which tends to stick to surfaces and promote corrosion faster than you might expect. And if that weren’t enough, temperatures can change drastically, especially on ships moving between certain climates, causing condensation to form inside enclosed areas that were once considered safe.
This is no small annoyance. For marine electronics PCBs, this is an everyday hazard. If left unchecked, salt and moisture will work together to eat away at solder joints, peeling layers off, and ultimately short-circuiting the entire system. That’s why good PCB design for the marine environment starts with understanding what you’re dealing with. It’s not just about making it work; it’s about keeping it functional, even in the harshest offshore conditions.
How Moisture and Salt Corrosion Affect PCBs
Once moisture gets in, things tend to change quickly, especially if there is salt involved. Together, they don’t just stay on the surface; they trigger reactions that gradually destroy components from the inside out. One of the main causes is electrochemical migration, a process in which metal ions move across the PCB under the influence of voltage and humidity, often forming small conductive paths that ultimately short-circuit the board.
Salt also accelerates corrosion of metal scraps, creating hidden damage that may not be visible until it is too late. This kind of degradation doesn’t just stop at reduced performance; it leads to major failure.
Common failure modes in salt prone environments:
- Corrosion on copper traces and connectors
- Delamination between PCB layers
- Swelling or warping of the board material
- Solder joint degradation
- Short circuit of conductive salt residue
- Component damage due to trapped moisture
Waterproof Method for Long Term Reliability
There is more than one way to keep marine electronics PCBs protected. The proper method often depends on the direction of the board and how often it is exposed to the elements.
But at its core, each approach tries to solve the same problem: keeping moisture and salt from damaging the circuit.
Conformal coatings are often the first layer of defense. This thin, protective layer, whether acrylic, silicone, or urethane, covers the board and helps block contaminants. For more difficult situations, engineers often turn to potting. This is done by encasing the boards in a resin compound that locks everything in place, providing complete protection against moisture ingress.
Some choose nanocoating, an ultra-thin coating that repels water without changing the weight or flexibility of the board. And don’t forget protective covers, which combine a physical barrier with sealing to completely block out moisture.
Comparison of waterproof methods for PCB:
| Method | Protection Level | Flexibility | Cost Range |
| Conformal Coating | Currently | Tall | Low to Medium |
| pot | Very high | Low | Medium to High |
| Nano Coating | Light moisture barrier | Very high | Currently |
| Protective Enclosure | High (external only) | Depends on design | Currently |
These solutions often work best in combination with, for example, marine applications of PCB conformal coatings in sealed enclosures, or potting for waterproof PCBs used in underwater units.
Testing Standards for Marine Grade Circuit Boards
Before waterproof maritime PCBs can be trusted to survive offshore, they must prove themselves. That means undergoing some serious testing, not just to check that it works, but to see how it performs when the going gets tough.
This is also not a general benchmark; these protocols are drawn from established protocols used in the military, space and maritime sectors.
For example, IPC-CC-830 is the best choice for verifying the performance of PCB conformal layers in marine and harsh environments. Meanwhile, MIL-STD-810 includes procedures such as salt fog testing that simulates years of exposure in just a few days. Additionally, there is an IP rating, a more commercial way of indicating how well a product blocks water and dust.
General standards for marine PCB testing:
- IPC-CC-830 (conformal coating qualification)
- MIL-STD-810 (environmental test method)
- IP67/IP68 (intrusion protection rating)
- ASTM B117 (salt spray corrosion testing)
- ISO 20653 (vehicle equipment protection, marine adaptation)
Meeting these benchmarks is not only good practice; this is often important for making corrosion-resistant electronic devices that can handle life at sea.
Typical Applications in the Maritime Industry
PCBs in the maritime environment often work behind the scenes, but they do some pretty important work. Here’s where you’ll usually find an IP rated PCB hard at work:
- Navigation System – Supports GPS, radar and digital mapping tools.
- Machine Control Unit – Handles real-time adjustments in propulsion and fuel systems.
- Marine Communications Devices – Ensure smooth operation of radios, satellite links and emergency beacons.
- Underwater Robotics – Powering sensors and motors on submersible inspection or research equipment.
- Lighting Systems on Airplanes – Manage energy efficient lighting throughout the ship.
Each of these applications relies on reliable, salt-resistant circuit boards that are built to withstand extreme conditions.
Support Services for Waterproof PCB Design and Maintenance
Designing waterproof maritime PCBs is one thing; making sure it keeps working, year after year, is another matter. This is where the right support is important.
Altimex not only supplies marine electronics PCBs; we work closely with customers from concept to delivery. Whether it’s selecting the best conformal coating, choosing between pots and sealed containers, or validating a build against marine-grade testing standards, our team brings real-world experience.
And if something goes wrong? Our repair and testing services can help return a board to full working condition, often without requiring a complete redesign.
If you’re working on a project that requires corrosion-resistant electronics or are just exploring PCB design options for marine environments, you can always contact us for a quick and fruitful conversation.
From plating and potting to design advice, PCB assembly and testing, the right strategy will make a difference. And if you’re not sure where to start, Altimex is always ready to help with expert support in marine electronics PCB solutions.
The post Do Maritime PCBs Have to Be Waterproof? appeared first on Altimex.
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