RE: Corrosion caused by batteries.

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I am getting fed up with the corrosion at the negative or positive
terminals of Duracell AA and AAA batteries that come preinstalled
(from the manufacturer/distributor) in wireless motion detectors and
door/window contacts, as well as corrosion within the devices after a
year or two on the job site, all residential.

Are there any tricks to prevent corrosion? Vaseline, jells, etc? Does
anyone have a clue as to the root cause of corrosion? I know that
water/high moisture is a prime catalyst especially on door switches
that are near the bottom of an exterior door. Does the passage of
voltage from the battery to the battery holder have an effect, and if
so, how? It's also obvious (duhhh)that if the battery(s) are absent
from the battery holder compartment there is never any corrosion in
the holder.

Charlie

Re: Corrosion caused by batteries.
On Tue, 12 Nov 2019 00:28:02 -0500, chasbo@shore.net wrote:

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Googled my concerns. Read lots of info online re alkaline batteries.
Still interested in your opinions.

Thanks. Charlie

Re: Corrosion caused by batteries.
On Tuesday, November 12, 2019 at 12:27:41 AM UTC-5, cha...@shore.net wrote:
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I don't have that problem but as a (salt water)  boat owner for many years,
 I have successfully used Vaseline and conducting Silicone grease on electr
ical connections. The Vaseline was used on boat battery terminals and the s
ilicone was used on smaller electrical connections. Both very messy to work
 with but did the job.
The only place I could get the Silicone grease in my area was at an automot
ive parts store. Comes in small squeeze tubes. Just need to smear a coating
 on connections with just a little excess.  

I got the idea about the Silicon from observing that the TV cable guys woul
d use it under their rubber connection boots that they would cover their ou
tdoor connections with.

Re: Corrosion caused by batteries.
On 11/12/2019 1:16 PM, Jim Davis wrote:
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I was able to get dielectric silicone grease from ADI in squeeze tubes  
much cheaper than any local source.  Decent size squeeze tubes.  Big  
enough to get your hand around.  I still have one in my specialty lubes  
cabinet in the shop.



Re: Corrosion caused by batteries.
On Tuesday, November 12, 2019 at 12:27:41 AM UTC-5, cha...@shore.net wrote:
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With regard to your question about the source of the corrosion ====
 again drawing from my boating experience ---- Boats, particularly in salt  
water have to have what are called sacrificial zincs installed on any metal
s that are submerged in the salt water. Such as propeller shafts, rudders,  
water intakes, etc. Also, all metal objects that protrude through the hull,
 into the water must be connected inside the boat with a common wire. If th
is isn't done  what takes place is Galvanic corrosion.  

If you put a electrolyte (salt water) between two dissimilar metals within  
close proximity to one another === if the metal objects have the slig
htest difference in electrical potential, the object with the highest elect
rical potential will lose it's substance ion by ion and be attracted to the
 object with the lowest potential (cathode) resulting in a "corrosion" of t
he object of the highest potential.  

In other words electro-plating  

However, even if there is no difference in potential, the metal with the gr
eatest "nobility" will lose it's ions to a metal in close proximity of lowe
r "nobility" in the presence of some sort of electrolyte or if touching one
 another.

In your case the moisture in the air is the "electrolyte" and how long the  
battery (anode) is in contact with the battery clip (cathode).

Just an aside === you'll note that most/all battery clips are "shiny"
. This is because stainless steel is very low on the "nobility" list and is
 a good way to reduce the Galvanic process. So it's likely that the quality
 of the stainless steel clips are a factor also.  

This is also the reason that the small lithium button cells are stainless.  
Since they last so long, they would corrode if they were made of a more "no
ble" metal.


Try the Silicon or Vaseline. It will likely last as long as the battery but
 as I say, it's messy especially when changing batteries.

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