What is stray current corrosion, and how do you prevent it?

What is stray current corrosion and how do you prevent it from happening to your boat? I have heard of zinc anodes, isolation transformers and galvanic isolation. What do you recomend and why?


What does it roughly cost per year to maintain a 20 foot speed boat (not including boat payment)?

Stay current is always present as long as the battery is connected, the current is passing through the entire metal structure of the engine and running gear. Formally know as electrolysis. Zinc anodes work very well. the are eaten away by the electrolysis rather than your engine and running gear..Isolation transformers also work, not allowing the current to flow to metal parts. These items are cheap in comparison to the damage that can be done with out them.

Has anyone tried leaving their pontoon boat in the water all winter in a northern state?

Marinas or places with a lot of electic current being leaked into the water are the wosrt for electrolisis, If your boat is permanently moored in these places it is recomended that you protect your boat at a minimum with sacrificial anodes at least on your shafts props / Stern drive and hull. Out boards generally he anodes inbult that are replacable.

which are most reliable outboard engines 50 hp 4 stroke /??

After 12 months in the water the condition of your anodes should tell you if you should take other measures to protect your boat.

What is similirity between a ship & a Lady ?

If your boat is trailerable and is not left in the water it will be fine

why do boat trailers cost so much there is nothing in them, where can I get a cheap one.?

If you have an outboard motor or an in/outboard, your motor or out drive will already be equipped with anodes that do this. Most motors, in and out have had them on the motor or outdrive for the last 20 years, with the exception of some of the smaller ones that normally aren't in the water all the time. If you have an older boat with a direct drive you may need to add an aftermarked anode.

An old song about life on a whaling ship included these lyrics "clear away the running gear and blow ye winds

outboards have sacrificial zinc anodes built on them, you may also buy a chunk of "ZINC" ( they shape them like a fish, why, I don't know), and connect it to the railing of your boat, and toss it over the side, the "Zinc" will attract the stray current in the water, away from the boat. You take it in when under way.

how does cargo affect how a boat floats?

all good answers. also check in to Mercury's Mercathode sysem. it's more deliberate than anodes.
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