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| Electrolysis: Fresh water vs. Salt water https://www.smwebhead.com/phpBB3/viewtopic.php?f=2&t=3770 |
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| Author: | lake_norman_vic [ Sun Jun 14, 2009 5:12 pm ] |
| Post subject: | Electrolysis: Fresh water vs. Salt water |
I have my 89' 245 Vista in a wet slip year around on a fresh water lake. It's always plugged in to shore power (keeping my beer cold). Is electrolysis existent in fresh water as it is in salt water? I was once told electrolysis only exists in salt water and sacraficial zincs aren't needed in fresh water. Any input? Thanks in advance. |
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| Author: | bndfishing [ Sun Jun 14, 2009 6:29 pm ] |
| Post subject: | Re: Electrolysis: Fresh water vs. Salt water |
you will get electrolysis anytime you have 2 dissimilar metals in an environment except pure water. It isn't as bad in fresh water but your zincs are very much needed, some of the new thought is to have aluminum or magnesium instead of zinc in fresh water. The bigger problem is stray electrical current in your moorage that can eat your below water metal faster than anything. |
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| Author: | yrless11 [ Sun Jun 14, 2009 7:09 pm ] |
| Post subject: | Re: Electrolysis: Fresh water vs. Salt water |
230Mike explains it best ~1/2 way down in this thread: http://www.smwebhead.com/phpBB3/viewtopic.php?f=3&t=3116&hilit=anode |
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| Author: | LouC [ Mon Jun 15, 2009 6:50 pm ] |
| Post subject: | Re: Electrolysis: Fresh water vs. Salt water |
Yep electrolysis (more correct term is galvinism) can happen in fresh water too depending on the amount of dissolved minerals in the water....just because it's fresh water does not mean that there are no dissolved minerals that can cause galvinism when you submerge 2 metals that are different on the nobility scale (like alumium and stainless or aluminum and copper). In fact if I remember right when the Merc Bravo III was having its corrosion problems...some of the worst ones were in fresh water regions. Plus in a marina if there is shore power you have to watch out for stray currents....Even though I am in salt water....I am on a mooring...no shorepower...so corrosion is really not such a big problem...but marine growth is for outdrives...the anti fouling paint does not last all season so you have to pull the boat and re-paint about the end of July... There are actually ways you can test your drive to make sure it's adequately protected....I think there was something about this on http://www.boatzincs.com Anyone who tells you that you don't need anodes because you're in fresh water....is just guessing....and may be guessing wrong.... |
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