When I was looking at the last service sheet saw a tick near the battery box. Written far as I could understand it said Electrolysis. Looking at the spot there is a small hole in the bodywork as if it had "rotted". For want of knowing about this I soaked it in white vinegar over 24 hrs , cleaned it up and put filler in and repainted . Can hardly see where it is now .
Electrolysis
- Thread starter Robert_374373903
- Start date
I am shocked that the engineer did not point it out personally and advise how best to deal with is.
John
The only conversation to me was Alls good just a bit of damp by the fire vent , just needs some mastic around it .
That happens when there is damp inside the wall and the screws rusts. The screw material combined with the rust can have a chemical reaction known as electrolysis causing the hole. We had this issue with a Lunar caravan and that is how it was explained to me by a (chemical engineer?).
I would think the handwriting would probably show "Electrolite" which to myself would make make more sense.
Not so sure,
Electrolysis of molten salts - Electrolysis - AQA - GCSE Chemistry (Single Science) Revision - AQA - BBC Bitesize
Learn about and revise electrolysis with this BBC Bitesize GCSE Chemistry (AQA) study guide.
www.bbc.co.uk
John
Galvanic action can be another issue. Two electrochemically dissimilar materials that come into contact with each other can generate a small current which in turn can then accelerate corrosion. Particularly if they get wet.
I wonder if the location of the hole being near the battery box may give a clue to it's cause?
Perhaps it is galvanic (sometimes known as electrolytic corrosion) where as Sam says dissimilar metals in contact might react together, or could it have been a splash of battery acid which is an electrolyte.
Perhaps it is galvanic (sometimes known as electrolytic corrosion) where as Sam says dissimilar metals in contact might react together, or could it have been a splash of battery acid which is an electrolyte.
Unfortunately I no longer have the pictures, but on our Lunar Delta TI there was a leak around the flush refill for the toilet. This caused the screws inside the skin to start rusting causing the aluminium sides to look pitted in that area. Therefore I would suggest in the first instance is to do a damp check in that area as soon as possible.
More likely to be galvanic corrosion. Back in Nelsons era Royal Navy ships had copper sheathing to clad the undersides and keep barnacles and weed at bay. The copper cladding was fixed on with iron nails. Lots of lovely galvanic cells and quite a bit of valuable copper dropped to the sea bed.
Thank you guys for comments. Today had all the contents out of front locker, then tried to see from the inside where the hole was but prevented this by a panel which goes right across caravan . However there is no sign of dampness there ,plus the spot where it is which is just above the bottom "awning" rail and about 30cm from the battery box. I cannot get to . The writing on the service sheet was a bit unclear towards the end of the word.
Slight deviation but my Grandfather used to wear a Copper Bracelet. Supposedly to keep away rheumatism (sp) but I wouldnt' describe him as a live wire in his old age 
Had further thoughts on this subject, way back in January 21 I posted about my battery leakage when I took it out . Just wonder whether it did leak and some how made its way to the spot we are talking about . Thinking I will take this battery out as it is new to see if there were evidence of leak in last battery
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