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Boat Forum / Building / November 2004Zincs Needed In Fresh Water?
Hi I was wondering if anyone knows if you need to have zincs on your prop shaft in fresh water?The one on mine looks original(20+ years) and still appears 99% intact. Thanks Dave > Hi I was wondering if anyone knows if you need to have zincs on your > prop shaft in fresh water?The one on mine looks original(20+ years) > and still appears 99% intact. > Thanks Dave Pure "fresh" water does not conduct, and will not foster elecrolytic corrosion. Therefore, in theory, you do not need zincs. All water contains some dissolved salts, and those loose ions do permit corrosion a slow as you like. Zincs won't hurt, magnesium is better for fresh water, but if they don't dissapear, don't replace them. They won't work at all if they have been painted. Terry K Yes, don't replace them if they don't disappear, but *DO* do the following: - Inspect for signs of corrosion, especially in areas where there may be junction between two metals or an air gap. Rivets and the connections on your bonding circuit (grounds) are in particular susceptible ...loose rivets means corrosion likely exists and bonding circuit connections should remain clean. They should also be sprayed with something like Corrosion X to keep them clean and corrosion free. - Once a year or so, remove the zincs (or magnesiums) and wire-brush them and the boat where they mate up. It doesn't hurt to use a wire brush them on the outside too if it looks like crud or paint is preventing good water contact. Brian D >> Hi I was wondering if anyone knows if you need to have zincs on your >> prop shaft in fresh water?The one on mine looks original(20+ years) [quoted text clipped - 13 lines] > > Terry K I have a steel boat in fresh water and I keep all of my zincs on even when stored on the cradle as per recommendation of my surveyor when I originally purchase the boat. Leo s/v Red Rover > Hi I was wondering if anyone knows if you need to have zincs on your > prop shaft in fresh water?The one on mine looks original(20+ years) > and still appears 99% intact. > Thanks Dave That just means you have a properly bonded and isolated electrical system on your boat and a properly set up shore power to your dock...or your mooring. That also means all the boats nearby are in good electrical order. Were they not, you would see the zincs going. I replace mine every four years or so in Lake Ontario. It's a cheap fix, cheaper than bronze thru-hulls at any rate. R. >Hi I was wondering if anyone knows if you need to have zincs on your >prop shaft in fresh water?The one on mine looks original(20+ years) >and still appears 99% intact. >Thanks Dave Good point. In addition to my other recommendations, use a zinc saver (diodic isolator) on your port power to prevent boat and zinc corrosion when plugged in at a dock somewhere. Brian D > That just means you have a properly bonded and isolated electrical > system on your boat and a properly set up shore power to your [quoted text clipped - 11 lines] >>and still appears 99% intact. >>Thanks Dave Zincs in salt water, magnesium in fresh. Install magnesiums, even if you currently do not have a problem. Things can change and if they do, you will be protected. Steve > Hi I was wondering if anyone knows if you need to have zincs on your > prop shaft in fresh water?The one on mine looks original(20+ years) > and still appears 99% intact. > Thanks Dave |
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