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Author Topic:   Bonding Wire Application
kwik_wurk posted 03-10-2008 02:45 PM ET (US)   Profile for kwik_wurk   Send Email to kwik_wurk  
My boat has bonding wires all over the place and they are great. I have a working understanding of the sytem, its chemistry, and function, but I am no expert. However I have some items that are at or just above the waterline that are not bonded. These stainless steel items are rusting and streaking on the interior.

If I bond these items will I get any benefit? They are occasionally submerged, occasionally totaly dry.

Any ideas?

thanks

deepwater posted 03-10-2008 05:36 PM ET (US)     Profile for deepwater  Send Email to deepwater     
I don't think bonding will stop the rust streaking your talking about all (most) SS will rust some is even magnetic to a certain degree (more or less)its the welded areas your talking about right well that's the quality of the weld that's rusting not enough rare gas was used and the welding brought the steel to the surface and now it rusts
jimh posted 03-10-2008 07:37 PM ET (US)     Profile for jimh  Send Email to jimh     
Bonding of dissimilar metals is useful for preventing galvanic corrosion. It does not prevent corrosion from exposure to corrosive materials.

Galvanic corrosion occurs whenever two dissimilar metals are immersed in an electrolyte.

Corrosion occurs whenever a metal is oxidized by exposure to an oxidant.

kwik_wurk posted 03-10-2008 09:14 PM ET (US)     Profile for kwik_wurk  Send Email to kwik_wurk     
To answer some specutlation:

Corrosion is occuring at through-hull bolts, that are all SS material. The through hulls are not leaking, but do show standard rusting of the washers and rust weeping on the interior hull. This is the only spot on the entire boat that I have heavy SS corrosion.

The space (an aft lazerette) is not well vented, so there is moisture content on the interior. Everything else in the space is fine and rust free (SS, bronze, and aluminum). There are no caustic materials, other than standard moisture (from rain).

And yes Jim seems to answer my question, if the bonded item is not in contact with the water, there is not galvanic reaction, just plain corrosion (oxidation/exposure).

I'll have to figure something out.

Thanks all.

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