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From: Adrian Tuddenham on 22 Jul 2010 07:40
Joe <none(a)given.now> wrote:

> In article <srmdnXYgL9GOJtrRnZ2dnUVZ_gOdnZ2d(a)supernews.com>, "Gary Brown"
> <garyjbrown(a)charter.net> wrote:
>
> > Hi,
> >
> > Some of the batteries in a lamp leaked and made a mess of the
> > contacts. The contacts are springs that aren't very accessible
> > so abrading off the residue isn't feasible. Is there a solvent
> > or other means of removing the residue?
> >
> > Thanks,
> > Gary
>
> If it's the white powder left after alkaline cells leak, try using plain
> water for the solvent. It's worked well for me a couple of times.

I have found that the corrosion from alkaline cells is almost impossible
to remove by abrasives or scraping, but it comes off easily with water
and a good rubbing from a scratchy nylon cleaning pad.


--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
From: Jim Yanik on 22 Jul 2010 08:54
"Gary Brown" <garyjbrown(a)charter.net> wrote in
news:srmdnXYgL9GOJtrRnZ2dnUVZ_gOdnZ2d(a)supernews.com:

> Hi,
>
> Some of the batteries in a lamp leaked and made a mess of the
> contacts. The contacts are springs that aren't very accessible
> so abrading off the residue isn't feasible. Is there a solvent
> or other means of removing the residue?
>
> Thanks,
> Gary
>
>

it depends.
are the batteries alkalines,or "heavy duty"(carbon-zinc)?

for alkaline leaks,you use a mild acid like vinegar to neutralize the
leakage.
For carbon-zinc,you a mild base like baking soda to neutralize the leakage.
then rinse with plain water and dry.


the only problem left is that the chrome plating is usually gone from the
contacts,and they will rust eventually.

--
Jim Yanik
jyanik
at
localnet
dot com
From: whit3rd on 22 Jul 2010 10:26
On Jul 21, 8:33 pm, "Gary Brown" <garyjbr...(a)charter.net> wrote:

> Some of the batteries in a lamp leaked and made a mess of the
> contacts. The contacts are springs that aren't very accessible
> so abrading off the residue isn't feasible. Is there a solvent

The replacement of plating on steel springs can be
accomplished by solder-plating, or by soldering on a
bit of brass to the end of the spring. Other (leaf) contacts
can be scraped clean.

Alas, the only effective way to get the residue off the
metal is some kind of abrasion or scraping. Can you
get a small sandblast/glass-bead-blast nozzle to the
affected area? Or maybe an electric eraser?
From: Winston on 23 Jul 2010 09:16
On 7/22/2010 7:26 AM, whit3rd wrote:
> On Jul 21, 8:33 pm, "Gary Brown"<garyjbr...(a)charter.net> wrote:
>
>> Some of the batteries in a lamp leaked and made a mess of the
>> contacts. The contacts are springs that aren't very accessible
>> so abrading off the residue isn't feasible. Is there a solvent
>
> The replacement of plating on steel springs can be
> accomplished by solder-plating, or by soldering on a
> bit of brass to the end of the spring. Other (leaf) contacts
> can be scraped clean.
>
> Alas, the only effective way to get the residue off the
> metal is some kind of abrasion or scraping. Can you
> get a small sandblast/glass-bead-blast nozzle to the
> affected area? Or maybe an electric eraser?

After cleaning to bare metal and degreasing, I wonder if
the contact can be protected with electroless tin plating?

<http://www.mouser.com/ProductDetail/MG-Chemicals/421-125ML/?qs=sGAEpiMZZMtyU1cDF2RqUHvHtsi3Lp2KTMqoiPz0UxQ%3D>



--Winston
From: Jim Yanik on 23 Jul 2010 10:48
Winston <Winston(a)bigbrother.net> wrote in
news:i2c4hg02lgu(a)news4.newsguy.com:

> On 7/22/2010 7:26 AM, whit3rd wrote:
>> On Jul 21, 8:33 pm, "Gary Brown"<garyjbr...(a)charter.net> wrote:
>>
>>> Some of the batteries in a lamp leaked and made a mess of the
>>> contacts. The contacts are springs that aren't very accessible
>>> so abrading off the residue isn't feasible. Is there a solvent
>>
>> The replacement of plating on steel springs can be
>> accomplished by solder-plating, or by soldering on a
>> bit of brass to the end of the spring. Other (leaf) contacts
>> can be scraped clean.

but will still rust after some time.
I have a little handheld personal fan with a corroded rusting endcap
contact plate,that is heat-staked to the endcap.can't solderplate it
without melting the plastic cap.


you also assume you can get access to the springs.
some may not want to pry apart their devices to get that access.
some flashlights may not be able to be dismantled to where you can get
access to the upper spring contact.

>>
>> Alas, the only effective way to get the residue off the
>> metal is some kind of abrasion or scraping. Can you
>> get a small sandblast/glass-bead-blast nozzle to the
>> affected area? Or maybe an electric eraser?
>
> After cleaning to bare metal and degreasing, I wonder if
> the contact can be protected with electroless tin plating?

That sounds like a good idea,but how do you get the plating solution to the
contact without plating other things around it?
>
><http://www.mouser.com/ProductDetail/MG-Chemicals/421-125ML/?qs=sGAEpiMZ
>ZMtyU1cDF2RqUHvHtsi3Lp2KTMqoiPz0UxQ%3D>
>
>
>
> --Winston
>



--
Jim Yanik
jyanik
at
localnet
dot com
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