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| Foam in pylons cause salt corrosion!? http://www.hobie.com/forums/viewtopic.php?f=20&t=5392 |
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| Author: | ALEXSAILS [ Tue Nov 21, 2006 6:34 am ] |
| Post subject: | Foam in pylons cause salt corrosion!? |
Hi, just wanted to share an observation I made a few weeks ago when I took the hulls appart from the frame castings of my H16. I noticed that my pylons where/are badly corroded by salt deposits in the top 2 inches or so of the pylon. Upon further inspection I found out that the foam plugs where just saturated with salt cristals which were the same found encrusted to the pylon walls inside and around the bolt holes. No matter how well we seal the pylon to casting joint with 5200 (leaving a vent for vent tube) salt water will still get into the foam/casting/pylon over time and eat away at the thin alum extrussion. In contrast I also inspected the rails to casting and front/rear crossmembers to castings joints and none had any signs of salt deposit or corrosion caused by salt. These just had some dust/dirt in them with easily came off with soap and a rag. So my guess is that the pylons get corroded by salt trapped inside while the rails and crossmembers dont because salt water gets in and out. I wont be repluging the pylons with foam after I finish painting the hulls! Any minimal water getting in the pylon will drain into the hull and removed after each use thru the drain pug. The pylon already comes with a 3/8" or so hole near the bottom with allows for breathing and draining. My H16 is from 1987 "old" dont know if the new boats have foam plugs in the pylons as well? |
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| Author: | mmiller [ Tue Nov 21, 2006 10:18 am ] |
| Post subject: | Plugs |
We currently plug the pylons to the top so the water cannot be trapped. |
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| Author: | ALEXSAILS [ Tue Nov 21, 2006 12:26 pm ] |
| Post subject: | |
The foam plugs in my H16 where also to the top of the pylon/flush. Im not saying that they accumulate a pool of salt water inside the pylon. Instead I think that the foam accumulates salt in its pores and in between the foam and the alum walls causing the salt to stay and eat at the alum extrusion. Why doesnt this happen to the rails or crossmembers? |
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| Author: | Gahamby [ Thu Mar 07, 2013 1:34 pm ] |
| Post subject: | Re: Foam in pylons cause salt corrosion!? |
I know this thread is old. I just wanted clarification on pylon plugging. Is it one plug per pylon, installed flush to the top, and sealed with marine grade silicone? I have extracted about 3 plugs worth of foam out of the pylons on my '85 H14T. The bottom layer was saturated with water. Should the bottom of the pylon be sealed from the inside? Please advise, thanks GH |
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