"David Billington" wrote in message
news
On 04/09/18 09:13, Gunner Asch wrote:
On Mon, 03 Sep 2018 21:46:17 -0700, Larry Jaques
wrote:

On Mon, 3 Sep 2018 04:55:20 -0700, Bob La Londe
wrote:

On 9/3/2018 3:49 AM, Gunner Asch wrote:
On Mon, 3 Sep 2018 10:27:37 +0000 (UTC), unk
wrote:

I've done some electrolytic derusting of small things with a 10
amp
battery charger. Works great, biggest was a Vespa frame, took
some days
as I recall.

Now I'm thinking of a car frame. I don't mind leaving it for a
while, but
is that charger going to do anything at all or is there a sort
of
threshold current/area ratio?
1. Can you locate a suitable container to hold that much water
and
TSP along with a car frame?

If so...yes..it will work. You will need more than 10 amps of
power..simply because its a much much bigger surface. You will
be
able to do it with 10 amps..but it will take much..much longer.

You will also need to put extra electrodes along the frame to
allow
good electrical connection through the water along the sides of
the
frame. You may..may have to turn the frame over once one side is
derusted so the current can do the other side.

If you put electrodes along both sides of the car frame..it will
work
better and much faster.

Got a pool thats not being used for anything? Car frame is
what...15'
long by 5-6' wide?

That could be done in a plastic lined hole in the ground and
only cost
you shovel time and multiple layers of plastic.

Gunner
__


All of that sounds fascinating, but for a one off project like a
car
frame wouldn't a sand blaster and a big bag of glass beads be the
answer? Some time back I converted a boat trailer into a flatbed
utility trailer. We did the whole thing, and blew the slag off
the
welds we couldn't reach with a hammer or a wire wheel with a hand
held
self contained sand blasting gun and a bag of playground sand.
Ditto sandblasting the grunge. Then wash with phosphoric acid
prep.

Klean-Strip 1 gal. Phosphoric Prep and Etch $15.98 @ Home Depot.
Absolutely. I wouldnt try electrolysis on a car frame on a
bet...well..if there were enough money involved...but...

Thats why I have a portable blaster tank and a few hundred pounds
of
playground sand in bags out in the back 40.

__

"Poor widdle Wudy...mentally ill, lies constantly, doesnt know who
he is, or even what gender "he" is.

No more pathetic creature has ever walked the earth. But...he is
locked into a mental hospital for the safety of the public.

Which is a very good thing."

Asun rauhassa, valmistaudun sotaan.


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In the UK it's illegal to sand blast with silica sand due to the
silicosis hazard, is that also the case in the US. I occasionally
use black beauty (copper slag IIRC) or glass beads, aluminium oxide
or silicon carbide.


I bought some Black Beauty at the source, a coal fired power plant.
http://www.marco.us/abrasives/coal-s...auty-coal-slag