Alodyning skins and large sheets

The aluminum metal definitely goes away. I
stand by my statement, and Alclad was not the point.

Bob Seals
M.S. Chemistry

-----------------------------------------------------

Dear Bob,

Of COURSE the aluminum goes away... if you use a strong enough solution or
leave it in the tank too long. But since you DID mention Alclad I think it's
fair for me to have assumed that WAS your point especially since lye has been
used as a surface treatment since Jeeter was pup. (Indeed, it is a REQUIRED
step for some finishes.)

-Bob Hoover (no, I'm the other one)
-Greasy Fingernails (and fifty years experience)

PS - you would have had better luck with your ballons if you'd used iron
filings and sulphuric acid... and yes, acid was -- and still is -- a standard
method of surface treatment for some metals. Visit a plating shop. Or an
aircraft factory :-)

wrote...
...
The process involves ... a submersible pump, ...
The pump is usually trashed after pumping phosphoric
for a couple of hours (but maybe not... had a little
all-plastic thingee that didn't seem to mind the
chemicals at all).


"Little Giant" brand pumps. They make hundreds of models. The
hardware stores carry the ones for water pumping (pool covers,
fountains, etc). Low cost, high quality. They also make a bunch for
chemical pumping at similar pricing. Used to order them on occasion
for customers back when I sold hardware.

Daniel

On 03 Feb 2004 02:37:17 GMT, (Veeduber) wrote:

The aluminum metal definitely goes away. I
stand by my statement, and Alclad was not the point.

Bob Seals
M.S. Chemistry

-----------------------------------------------------

Dear Bob,

Of COURSE the aluminum goes away... if you use a strong enough solution or
leave it in the tank too long. But since you DID mention Alclad I think it's
fair for me to have assumed that WAS your point especially since lye has been
used as a surface treatment since Jeeter was pup. (Indeed, it is a REQUIRED
step for some finishes.)

-Bob Hoover (no, I'm the other one)
-Greasy Fingernails (and fifty years experience)

PS - you would have had better luck with your ballons if you'd used iron
filings and sulphuric acid... and yes, acid was -- and still is -- a standard
method of surface treatment for some metals. Visit a plating shop. Or an
aircraft factory :-)


You are going to get Twyla ****ed off if you don't spell her name
correctly. It's pronounced Jeeter as in Jeep, but it's spelled
Geeter. Damn, I hope she isn't reading this group right now. Next
thing you know, she'll be after Tommy Cooper again for pulling Sally
Faukwash's undies down in the third grade.

BWB

I'm reminded of the time a student in an automotive class
put his engine block in the caustic solution over the
weekend. It works great on a cast iron block. Removes all
the crud, paint, etc.

However, on Monday, when he opened the tank to remove his
block, all he found was a few bits and pieces plus the
cylinder liners.

Caustic solutions and aluminum are NOT a good mix. Even an
aluminum engine block can be "eaten away". Think what it
will do to a thin aluminum skin...

John

I think the worst thing many of us has seen is someone buffing away
the alodyne on an older airplane to shine it up. Once the alodyne is
gone, the shine doesn't last and the skin re-oxidizes deeper. It
corrodes the airplane away in short order.

BWB