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Go Back   SailNet Community > On Board > Gear & Maintenance > Electronics
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Old 08-28-2012
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electronic rust proofing

can i get opoinons on elelctronic rust proofing have 55 ft steel does it work
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electronic rust proofing

It's called cathodic protection and yes it does! Ships use it to protect their hulls. It applies a voltage to the hull that counteracts the voltage that would be created by electrolytic corrosion. On ships, when used in conjunction with zincs, it is highly effective. I don't know of any units that are designed for boats, but if you find one, definitely a good idea for a steel hull! If you're electronically inclined, you may be able to design your own.
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Old 08-28-2012
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Re: electronic rust proofing

i understand electrolysis corrosion caused by internal battery problems and galvanic corrosion by earthing from shore power what about from moister internal in boat causing rust
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electronic rust proofing

A cathodic protection system will protect against that as well. Any time you expose two different metals (I.e. your boats hull and anything else that might be exposed) to an electrolyte (seawater) you've created a battery and the metal that is the anode will corrode. To protect it you either need to place a more anodic metal in the mix (zinc) or create a counter voltage that stops the reaction (sort of like "charging" the battery). Another advantage is that, in a properly tuned system, you'll only ever need one set of zincs as it will protect them as well.
You actually need to be MORE careful about shore grounding. If you become grounded, your system is now trying to protect your boat, the pier, other boats, and anything else that might be connected. I saw it happen with my ship via its new anchor chain. The lights dimmed and the system went crazy! Not good!
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