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Forum Index : Microcontroller and PC projects : Lithium cells don't like salt-water....
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
One of the residents at the local retirement village, wore their SOS pendant in the salted pool. The pendants are not submersible rated, so water got in there, and the Lithium batteries did not exactly like that...    Smoke makes things work. When the smoke gets out, it stops! |
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
Salt air can be equally nasty. We did some work at an airfield situated right next to the Ribble estuary. It's not far out to sea from there. We replaced several steel cabinets (for airfield traffic light control) made from zinc-plated 3mm steel with an extra thick powder coat on them. On several of them the doors had rusted through at the hinge fixing points and near the "T" handles and the steel was looking very sorry for itself in many places. The new cabinets are galvanized under the paint as well. It's a harsh environment out there, with wind-driven salt air. IP68 steel boxes aren't easy. Steel to keep the radar pulses out of the wiring! Another control panel on the same site was a mess. Open the door and components were literally hanging off the backplate and several screws were lying in the bottom. A couple of burned connections showed that it wasn't just fixing screws that were loose either. Mind you, it was bolted to the wall of a high speed wind tunnel so the high frequency vibration didn't help. :) I wish I'd been allowed to take pictures of some of the used and abused panels on that site. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
I was actually quite impressed with this. (the destroyed SOS pendant) I expect that once the salt-water breached the pendant internals, the salty water provided a circuit to short out the Lithium cells, but I was most impressed that this happened after just ONE swim. The pool uses "Salt-cells", which introduce salt to the pool water in the plant-room as the water is pumped around. I expect this is done simply as a cheap and effective way to sterilize the pool water, but then - I am NO pool tech!  Perhaps someone in the know when it comes to pools, can clarify if that is why they use salt-cells in the recirculation pumps and pipes and stuff. Smoke makes things work. When the smoke gets out, it stops! |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9129 |
The salt is electrolysed into hypochlorous acid (the active component of bleach) due to an electro-chemical oxidation reaction to keep the pool sterile. The salt concentration needed is quite low. e.g. . |
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| PeterB Guru Joined: 05/02/2015 Location: AustraliaPosts: 651 |
G'Day Grogs et al Mouse urine is very good for destroying elrctronics. I have had a car radio PCB go up in flames and that was after I had cleaned it. It smells a bit too.  Peter |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
Cheers, chums.  Yes, I have had a few computers come along that lived in a shed, and mice would get in there and piddle on the motherboard and/or cards. I only ever was able to revive one of those. All the others that have come my way with that issue, are too badly corroded and the just fail to work. Replacement PC time. Lovely and warm for a mouse inside a computer in the middle of winter though, so you can understand why they crawl in there if they can! Smoke makes things work. When the smoke gets out, it stops! |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
I had one (or maybe more) got into the shed and decided to live on a pile of electronics magazines. I had to throw a lot away. :( Edited 2023-07-07 16:55 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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