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Post by Deleted on Dec 5, 2016 7:06:13 GMT
I noticed that a couple of old tugs which were at Canary Wharf Until recently had anodes hanging on stainless wire with crimp rings and bolted to the vessel side deck.
I put a topic about it on cw a while ago - I think they were something to do with it being a different water quality forgotten the word but its when its not fresh water but not saltwater its half way. Or summit.
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Post by Deleted on Dec 5, 2016 7:12:21 GMT
I noticed that a couple of old tugs which were at Canary Wharf Until recently had anodes hanging on stainless wire with crimp rings and bolted to the vessel side deck. I put a topic about it on cw a while ago - I think they were something to do with it being a different water quality forgotten the word but its when its not fresh water but not saltwater its half way. Or summit. Brackish? I have seen anodes like this used on coastal boats too.no mains electrical connection. I guess it to protect the dissimilar metals particularly expensive bronze props.
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Post by Deleted on Dec 5, 2016 7:16:56 GMT
Yes Brackish is what I was thinking of.
Interesting about the props. I noticed the other day there is an old river Lea tug on the bank at Cody dock near canning town and it looked like a cast iron prop. I didn't stick the magnet to it. Perhaps it was bronze but had over time had steel deposited onto it by galvanic action ?
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Post by Deleted on Dec 5, 2016 7:18:58 GMT
Yes Brackish is what I was thinking of. Interesting about the props. I noticed the other day there is an old river Lea tug on the bank at Cody dock near canning town and it looked like a cast iron prop. I didn't stick the magnet to it. Perhaps it was bronze but had over time had steel deposited onto it by galvanic action ? Or like the stones song, painted black!
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Post by Deleted on Dec 5, 2016 7:37:40 GMT
I like that song.
It looked all rusty. Next time I go there I will get a magnet on it if I can as I am now intrigued.
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Post by Deleted on Dec 5, 2016 7:39:00 GMT
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Post by Deleted on Dec 5, 2016 7:43:59 GMT
Well I guess it won't need any anodes whilst moored there. Unless it rains a lot! Think the guy on the bike at the front is just about to get mowed down!
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Post by smileypete on Dec 5, 2016 10:56:50 GMT
Sure, you can get hanging magnesium anodes: www.google.co.uk/search?q=hanging+anodes+magnesiumAn anode welded to the hull will protect the area of the hull in close proximity to it (most folk suggest a few metres). An anode located in the middle of the boat with a separate bonding wire to the stern would have to have electrolytic currents flowing through the hull in order to do anything. I'm not sure what would happen but it certainly doesn't sound like a great idea to me. Yep, that is how anodes work.
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Post by Deleted on Dec 5, 2016 11:03:39 GMT
Sure, you can get hanging magnesium anodes: www.google.co.uk/search?q=hanging+anodes+magnesiumAn anode welded to the hull will protect the area of the hull in close proximity to it (most folk suggest a few metres). An anode located in the middle of the boat with a separate bonding wire to the stern would have to have electrolytic currents flowing through the hull in order to do anything. I'm not sure what would happen but it certainly doesn't sound like a great idea to me. Yep, that is how anodes work. Yeah, the hanging ones I have seen before. I guess they are for propshaft and prop as opposed to hull protection more on costal boats than inland jobbies
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Post by JohnV on Dec 5, 2016 11:04:22 GMT
what would be the volt drop on an unknown current flowing between the earthing point used and the point on the hull where the corrosion would be happening if you didn't have the anode bonded by a bit of wire to somewhere on the boat. Use words of no more than two syllables, answers by end of lesson on no more than 3 sheets of foolscap. (in passing explain crevice corrosion )
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Post by Deleted on Dec 5, 2016 11:15:09 GMT
what would be the volt drop on an unknown current flowing between the earthing point used and the point on the hull where the corrosion would be happening if you didn't have the anode bonded by a bit of wire to somewhere on the boat. Use words of no more than two syllables, answers by end of lesson on no more than 3 sheets of foolscap. (in passing explain crevice corrosion ) QUE? im from barcelona!
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Post by smileypete on Dec 5, 2016 11:31:11 GMT
Yeah, the hanging ones I have seen before. I guess they are for propshaft and prop as opposed to hull protection more on costal boats than inland jobbies IF they get rapidly eaten away you know you have problems! And not from a magnesium munching rat!
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Post by Deleted on Dec 5, 2016 11:34:34 GMT
Yeah, the hanging ones I have seen before. I guess they are for propshaft and prop as opposed to hull protection more on costal boats than inland jobbies IF they get eaten away you know you have problems! Not sure fish like Zinc unless served with chips!
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Post by Deleted on Dec 5, 2016 12:10:01 GMT
I think its really funny that the anodes one usually sees at the chandlery say "Duff" on them.
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Post by Deleted on Dec 5, 2016 12:18:25 GMT
I think its really funny that the anodes one usually sees at the chandlery say "Duff" on them. I thought they said M.G.Duff. was thinking of getting some for my MGBGT.
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