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Topic: Aluminium Corrosion (Powdery Rot) Repairs

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JTQU

07/10/2008 at 7:59am
Location: Hampshire
Outfit: Hymer Nova S

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Quote: Originally posted by Graeme Putt on 06/10/2008
What is the cause of this.

Any comments ?

Possibly its impurities in the aluminium sheet but much more likely to be damp in an item directly behind it. Such as a wood batten with steel screws or staples at the points of attack. Salts leaching out of damp wood will however be enough to initiate it even without any steel. The underlying problem is almost certainly damp now or at some time earlier.
The damp could of course be condensation where internal air is in contact with the skin or it could be from a leak.

Post last edited on 07/10/2008 09:31:53

michael

07/10/2008 at 9:38am
Location: Lancashire
Outfit: Caravan now Sold

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perforation 9 out of 10 times it is damp from the underside of the alloy sides.

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the only silly question is the one you do not ask.

664DaveS

07/10/2008 at 11:59am
Location: Shropshire
Outfit: Bailey Phoenix GT 75

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Its common on Land Rovers where steel door frames are attached to aluminium skin, its galvanic corrosion. On a LR I have used filler after treating the steel for rust.All the Ali corrosion needs to be cleaned off too.The ali is a bit thicker than on a van so it is possible to cut out and replace the metal.

I have seen it on aircraft (Helicopters) when I was in the RAF. The airframe techs cleaned all the paint off to bare metal, then removed all the affected metal and reskinned .Then repainted!

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664DaveS

08/10/2008 at 11:02am
Location: Shropshire
Outfit: Bailey Phoenix GT 75

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Quote: Originally posted by Graeme Putt on 06/10/2008
Hello everyone
Just been reading and then realised that my van has this sort of thing just starting off, about the size of a 10p piece.
The van is a 2005 Bailey Ranger.
What is the cause of this.

Any comments ?

Cheers Graeme

Graeme. If your van is a 2005 it should be covered by Bailey 5 year warranty against water ingress. It would be worth checking to see if there is damp near the corroded area . If so then see your dealer.

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michael

08/10/2008 at 11:51am
Location: Lancashire
Outfit: Caravan now Sold

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interesting this one,watch the vidio.

http://www.aluminumrepair.com/index.asp

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the only silly question is the one you do not ask.

dionea

08/10/2008 at 4:21pm
Location: Pink Panther Country (Co Durham)
Outfit: Avondale perle argos supreme

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Its called panel rot, & it starts from the inside, a repair is possible, but not only to the outside, the inner panels will need to be stripped off to get to the rear of the rotten area, the panel can then be sanded to remove all of the rot, a sheet of fibreglass with resin can then be stuck on the area, if you rub down the outside first, then put plenty of resin on the fibreglass sheet it should ooze through the holes, filling them for you. a final rubdown & possibly a little filler then paint on the outside & it should be a permanent cure, it is caused by damp so make sure you find out where the damp got in.

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N.E. Leisure products Registered Northern Distributor for Purpleline, Truma & Powrtouch. I supply, fit & repair the full range of motor movers at your door to single & twin axle models, contact me for details, free help always given. www.neleisureproducts.co.uk neleisure@sky.com

Camper1028

30/12/2015 at 10:24pm
Location: None Entered
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Try sanding with a polycarbide abrasive disc to get rid of all the oxidisation. Then use something like phosphoric acid to clean it off. Then use an etching primer, and paint. That ought to do it.

magicgrotto

31/12/2015 at 12:51pm
Location: Doncaster
Outfit: Disco1 300tdi 1990 ABBEY STAFFORD

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Hi camper1028
Specsavers me thinks ! LOL
It's an old post 2008 ! so a good few years old ! but you never know some 1 may have a look like I did !
Any way Happy new year 2016

Steve & Ange

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Camper1028

31/12/2015 at 2:02pm
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hah I did see it was old, but it's something I've been doing to mine lately and there wasn't any clear answers so I thought if I found it...others might!
Hope it helps someone anyway.

Scally1

06/9/2017 at 10:36pm
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I know this is an old post but I have a bit of corrosion just above the track following the line with where the water drains from the hot water tank, running down the track and off. I've now got a bit of hose I fit when draining the tank both wanted to check if this is the likey cause or don I have more of a damp problem...no evidence inside and last owner seals all joins every year. Thanks

magicgrotto

07/9/2017 at 11:32am
Location: Doncaster
Outfit: Disco1 300tdi 1990 ABBEY STAFFORD

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Hi Scally it starts from the inside and works it's way out ! I have some on mine ! how i fix was to dint it in with a rounder bit of bar then fill with Tiger seal (white of course) my vans 27 yrs old so expect a few holes here & there ! LOL

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chrisn7

07/9/2017 at 2:05pm
Location: West Yorkshire
Outfit: Bessacarr Cameo 625 2011

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The rot starts because the manufacturer installed the aluminium panel over some woodwork that has steel screws in it, such that the heads of the screws are in contact with the aluminium. This is ok, until the area gets wet either from ingress or condensation.

This sets off corrosion between the two metals, and the aluminium always loses this battle. Its the same as the lump of zinc put on a steel bridge - the alloy corrodes in preference to the steel, which is good, but in caravans the wrong way round.

Therfore the cause has to be tackled as well as the cosmetics or you will soon be back to square one,

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