Advanced Marine Electrics and Electronics Troubleshooting A Manual for Boatowners and Marine Technicians
CHAPTER 11 A Basic Corrosion Survey I n this chapter, we will look at some of the tools and procedures we use to conduct a basic ...
Many technicians prefer to use a common zinc electrode as a reference cell, and zinc will work. However, I prefer to use a silve ...
1 Is the boat’s cathodic protection system (assuming it has one) doing its job? 2 What is the overall condition of the boat’s bo ...
Range of Corrosion Potential (relative to silver/silver chloride Metals and Alloys half cell; volts) Cathodic or Most Noble (Pas ...
Bondingelectrically ties together all major fixed metal items and then connects them to the boat’s ground. This has two purposes ...
approach. Many European boatbuilders take this approach. In the United States, we favor bonding; the ABYC advocates bonding, and ...
boat in salt water that might give a hull poten- tial reading of approximately –550 mV to –900 mV would only give a reading of – ...
potential. The idea is to make sure that the potential reading you get with an anode (or anodes) attached to the system is at le ...
your valuable metal components. It’s time to replace them. 2 If the anodes were replaced recently, then the rapid loss of materi ...
Let’s assume the reading you get is within the prescribed range. You’re not done yet: 1 With your meter still connected and the ...
Finally, we need to check the dock’s potential. For this, we’ll move to the shore-power pedestal: 1 With the reference electrode ...
range could indicate DC stray current migrating through the dock ground sys- tem. This will require investigation. 4 Assuming th ...
Galvanic Isolators As mentioned above, each boat plugged in at a dock is helping to protect all the other boats at the dock. The ...
galvanic isolators can be used to effectively block galvanic currents up to about 1.4 V. By putting two diodes in series, you ca ...
Battery-potential stray current is another matter, and it can cause profound metal corro- sion in as little as 24 hours! If rapi ...
7 Replace the component immediately as it will cause rapid corrosion of metal parts sharing the same bilge water. 8 Another poss ...
Use a standard DVOM to track DC stray current through bilge water and home in on electrically “leaky” devices like pumps and flo ...
CHAPTER 12 Grounding Systems L et’s delve a little deeper into the vital but often ignored subject of grounding sys- tems. Depen ...
121 The exposed conductor ground plate, or the cumulative total area of multiple through-hull fittings and other exposed underw ...
122 electrical systems troubleshooting together via the grounding circuit inside the boat, or make up the entire grounding syste ...
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