7 Jan
2007
7 Jan
'07
2:40 p.m.
can you buy it in powder form? You mean you all apply
hcl to a circuit board??? Aint there a less caustic
substance for the job?
--- cctalk-bounces at classiccmp.org
<ploopster at gmail.com> wrote:
worrying about it fuming.
Chuck Guzis wrote:
> On 7 Jan 2007 at 10:12, Lyle Bickley wrote:
>
>> 1. I've only been able to buy gallon sized
containers of the 30% HCL
(Muriatic
>> Acid). That is very unwieldily to handle. A
polyethelene containter with a
>> small "spout" (available at
drugstores) is an
easy solution. Just be careful
>> when transferring the acid from the gallon
container to the poly container -
>> use a poly funnel - HCL is "nasty"
stuff.
>
> Another caution--DO NOT STORE THE CONTAINER IN
YOUR WORKSHOP OR
> WHEREVER YOU KEEP YOUR EQUIPMENT! Muriatic acid
is hydrogen chloride
> gas dissolved in water and tends to
"fume". Which
means that if the
> cap on the container is slightly loose or the
container is cracked,
> you'll be in for an eventual surprise.
>
> I kept a gallon of muriatic stored in my workshop
and thought the cap
> was screwed on tightly (it wasn't). After
about 2
weeks, I noted
> that all of my cast-iron shop equpment was coated
with a fine
> dappling of rust. My HCl is now stored in a
weatherproof container
> out-of-doors. I can't imagine what such
fumes
might do to the
> innards of a disk drive.
>
> For a somewhat tamer substitute, one might try
sulfamic acid--a
> powder dissolved in water and normally used for
cleaning masonry (as
> is muriatic acid). You can often find it at
stores that deal in
ceramic tile
supplies.
You can store hydrochloric acid dilute without
Peace... Sridhar
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7 Jan
7 Jan
2:56 p.m.
On 7 Jan 2007 at 11:40, Chris M wrote:
can you buy it in powder form? You mean you all apply
hcl to a circuit board??? Aint there a less caustic
substance for the job?
I've not tried it, but you might look at a retail product called
"CLR"--it's a calcium, lime and rust remover/cleaner. Available in
quart sizes at most home improvement and some supermarkets. I don't
know if it's strong enough for the job, however.
Cheers,
Chuck
3:56 p.m.
New subject: Use of HCL to dissolve severe corrosion from NiCad or Alkaline Batteries or oxidation
On Sunday 07 January 2007 11:40, Chris M wrote:
can you buy it in powder form? You mean you all apply
hcl to a circuit board??? Aint there a less caustic
substance for the job?
HCL is an acid, not a caustic. Caustic is strongly alkaline - as in Sodium
Hydroxide (Caustic Soda), Calcium Oxide (Caustic Lime), etc.
Leaking NiCad and Alkaline batteries have a very strong alkaline content which
can dissolve traces, edge connectors, components, etc.
One uses an acid such as HCL to dissolve the strong hydroxide and other
products of the alkaline "corrosion".
Cheers,
Lyle
--- cctalk-bounces at classiccmp.org
<ploopster at gmail.com> wrote:
worrying about it fuming.
--
Lyle Bickley
Bickley Consulting West Inc.
Mountain View, CA
http://bickleywest.com
"Black holes are where God is dividing by zero"
Chuck Guzis wrote:
> On 7 Jan 2007 at 10:12, Lyle Bickley wrote:
>> 1. I've only been able to buy gallon sized
containers of the 30% HCL (Muriatic
>> Acid). That is very unwieldily to
handle. A
polyethelene containter with a
>> small "spout" (available at
drugstores) is an
easy solution. Just be careful
>> when transferring the acid from the
gallon
container to the poly container -
>> use a poly funnel - HCL is
"nasty" stuff.
>
> Another caution--DO NOT STORE THE CONTAINER IN
YOUR WORKSHOP OR
> WHEREVER YOU KEEP YOUR EQUIPMENT! Muriatic
acid
is hydrogen chloride
> gas dissolved in water and tends to
"fume". Which
means that if the
> cap on the container is slightly loose or
the
container is cracked,
> you'll be in for an eventual surprise.
>
> I kept a gallon of muriatic stored in my workshop
and thought the cap
> was screwed on tightly (it wasn't).
After about 2
weeks, I noted
> that all of my cast-iron shop equpment was
coated
with a fine
> dappling of rust. My HCl is now stored in a
weatherproof container
> out-of-doors. I can't imagine what such
fumes
might do to the
> innards of a disk drive.
>
> For a somewhat tamer substitute, one might try
sulfamic acid--a
> powder dissolved in water and normally used
for
cleaning masonry (as
> is muriatic acid). You can often find it at
stores that deal in
ceramic
tile supplies.
You can store hydrochloric acid dilute without Peace... Sridhar
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
5:28 p.m.
New subject: Use of HCL to dissolve severe corrosion from NiCad or Alkaline Batteries or oxidation
On 7 Jan 2007 at 12:56, Lyle Bickley wrote:
HCL is an acid, not a caustic. Caustic is strongly
alkaline - as in Sodium
Hydroxide (Caustic Soda), Calcium Oxide (Caustic Lime), etc.
Well, as long we're picking nits...here we get into the area of
"Chemistry vocabulary" versus "Everyday vocabulary". While
"caustic"
generally connotes "corrosively basic" when talking about reagents in
the lab, strictly speaking, "caustic" implies only corrosive or
burning; either strongly acidic or basic, or even neither (see, for
example "lunar caustic"). The biological sense is "anything that
destroys living tissue".
When I was young, the treatment for canker sores was cauterization
(same root as "caustic") of the sore with a stick of lunar caustic
(it didn't work all that well, but the result looked better than the
alternative of applying a gentian violet solution, which didn't work
either).
Middle English caustik, from Latin causticus, from Greek kaustikos,
from kaustos, from kaiein, kau-, to burn.
Google "define: caustic" and see what pops up.
Cheers,
Chuck
6440
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