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Old 22 November 2003, 06:43   #1
nik
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Aluminium hulls

Hi, I hope some one can clarify this for me.
I had a look at an Aluminium hulled rib some months ago, there was signs of corrosion above the waterline (bubbled paintwork), which could have been fixed. But what concerned me more was the possibility of corrosion inside the hull.
1. How can you detect it
2. How can you fix it
I have no idea if there are inspection hatches or the like, but I do know that unprotected aluminium in salt water can corrode quite quickly. There is marine grade aluminium, but if this boat was made of it, then it will still corrode.
I would imagine that there could be problems with electrolysis as well.
Thanks, Nick.
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Old 23 November 2003, 16:27   #2
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Hi Nick

Suggest you talk to Ocean Dynamics in St Davids.

They build all their RIBS from alloy.

The other person is Crazyhorse on Ribnet.

Think the RIB he was looking at had a alloy hull so he may have done some digging and be able to help.

Regards Gary
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Old 24 November 2003, 03:20   #3
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PEPE Boatyards in Hayling Island also make Ali boats, they might give yo advice
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Old 24 November 2003, 04:21   #4
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Quote:
Originally posted by Garygee

The other person is Crazyhorse on Ribnet.

Think the RIB he was looking at had a alloy hull so he may have done some digging and be able to help.

Regards Gary

He's having one built in Canada
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When a boat looks that good who needs tubes!!!
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Old 24 November 2003, 07:30   #5
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Nik,

1. Its very difficult to detect corrosion inside hulls without getting access. If there are inspection hatches or if the deck unbolts then once you have got access corrosion is very easy to see.
Ultrasonic inspection from the outside is an option but is unreliable at finding localised pitting - which can lead to holes etc.

2. Fixing requires the corroded sections to be cut out and new sections to be welded in.

3. Anodes are normally used to protect the exterior hull surfaces - ne reason why they can't be used in the bilge as well but the point is to keep the water out of the bilge.

4. Finally, so you dont feel too bad - everyone with an aluminium, and to a lesser extent stainless steel under deck fuel tank is at risk of hidden corrosion should water sit in the bilge for extended periods.

When was that last time everyone inspected their fuel tank?

Duncan
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Old 24 November 2003, 09:19   #6
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Thanks for the replies.
These issues put me off the boat and someone else bought it. But I have seen it back up for sale again at around the same price??? I wonder why.
Nick.
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Old 24 November 2003, 10:30   #7
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corrosion

Just thought you may be interested in this web site if you come across any problems with corrosion, its very informative & helpful

http://www.corrosionsource.com
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Old 24 November 2003, 13:47   #8
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Thanks Julie, I am constantly amazed at what you can find on the internet. Curiously, one tip would appear to be not to paint your hull below the waterline, but maybe impractical due to fouling.
Thanks all the same, Nick.
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Old 24 November 2003, 17:24   #9
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was this a 7 metre ish jet drive project rib that needed a bit of work doing to it?
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Old 25 November 2003, 05:11   #10
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No, it is a NZ cabin rib 6.8m sterndrive. I have just noticed it was for sale in june 2001 as well.
Nick.
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