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Electrolysis

R

Robert_374373903

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 .
 
Robert_374373903 said:
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 .
Click to expand...
Looks like someone very handy with your hands well done
 
Robert_374373903 said:
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 .
Click to expand...

I am shocked that the engineer did not point it out personally and advise how best to deal with is.

John
 
Robert_374373903 said:
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 .
Click to expand...
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?).
 
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.
 
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.
 
ProfJohnL said:
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.
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That was my first thought on reading the initial entry.
 
Sam Vimes said:
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.
Click to expand...
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.
 
otherclive said:
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.
Click to expand...
A strip of copper on the apex of your roof keeps the moss away.
 
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 🙂
 
Robert_374373903 said:
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.
Click to expand...
it was well worth checking for your own peace of mind
 
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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