|Topic Review (Newest First)|
|12-28-2009 04:37 PM|
Originally Posted by cormeum View Post
|11-02-2009 06:24 PM|
Originally Posted by CharlieCobra View Post
|11-02-2009 06:17 PM|
|CharlieCobra||I'm going back with the galvanized bolts in replacement. Have any of you priced a 6" Bronze bolt lately? I'm not paying $17 per bolt when there's 200 of them. I'll be dipping mine in non-conductive liquid rubber but leaving the last bit of thread free for the nut. I'll then coat the nut and remaining threads with the LRB after I tighten them up. No moisture and no conductivity, therefore, no electrolysis. I'll replace whatever wood needs it and CPES the rest.|
|11-02-2009 04:32 PM|
Replace them all with Bronze. if the planking is really "iron sick" you may want to replace the worst of the planks. If it's just a little soft under the heads Smiths may work, but if more than half of the thickness is gone, it's not salvagable..
On bonding- correct, do not bond.
|11-02-2009 05:30 AM|
Originally Posted by timmynocky View Post
|11-02-2009 04:27 AM|
This is what the surveyor said. " Only replace the bolts with what ever was there." My inference was that the original 50 year old bolt material atoms and ions have soaked deep into the wood around the bolts. introducing new bolts of different metal into the old holes would establish two different metals in extremely close proximity. Electrolysis
Celenoglu, if your boat has galvanized fasteners that have replaced bronze fasteners I would suspect that the old bronze atoms and coatings are imbedded in the wood around the new galvanized repacments. Bronze having much lower corosion would attract ions away from the new galvanized fasteners, especially in such close proximety, a small battery is set up. The bigger problem in this is what effect it has on the wood, like a battery acid it destroys the wood.
|11-02-2009 02:26 AM|
|celenoglu||Electrolisis is said to occur on metals that are open to sea. But my boat says the opposite. All the metals even on deck are affected from electrolisis. The boat is built with copper and galvanized nails are used in different repairs. Although all are in the wood without any connection to outside the galvanized nails (although they are newer) are completeley gone or their thicknesses are equal to a pin. Do not use any dissimiliar metal even is they are inside the wood. They will be affected from electrolisis faster than you can imagine.|
|11-02-2009 02:11 AM|
Wooden Boat fastenings
You donít say what kind of wooden boat you have.
Is it carvel, lapstrake, plywood?
All those stainless screws would suggest that it is plywood but I could be wrong.
Itís difficult to advise without more information.
DIY Wood Boat.com
|11-01-2009 07:48 PM|
|paulk||I'd post on Woodenboat's forum to get the most exposure (and answers) to your questions about repairing a wooden boat with this many issues.|
|11-01-2009 07:39 PM|
|CharlieCobra||Starlight, check out my latest thread on Oh Joy in the Maintenance section. My advice is to replace the bolts as well. I'm waiting on answers whether to treat or replace some of the wood on several forums. Oh Joy was bonded with bronze straps and the SSB with copper tubing and a large bronze ground plate. Any fasteners exposed to seawater of dissimilar metals will be subject to electrolysis. My luck holds there as Oh Joy was C-Flexed in '94 so NONE of the fasteners are exposed at all. Good thing as I have several hundred of those bolts of dissimilar metals...|
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