[TheForge] Re: Free the Stake!

[David E. Smucker]

Your are right Peter, unless you know of someone with an industrial size 
system that will let you use it for free, as you say not very practical. 
Building you own is possible, but for sure not low cost.  As I say this I 
must say my data is very old -- like 35 years since I worked with ultrasonic 
cleaning systems.  Cost of a lot of this has come way down but still I 
expect very expensive in a one off system.

Dave
----- Original Message ----- 
From: "Peter Hirst" <saltydog335 at aol.com>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Sunday, January 20, 2008 5:08 PM
Subject: Re: [TheForge] Re: Free the Stake!


> The ultrasonic technology is fascinating, but how practical a suggestion 
> is it?  How might   get one or get access to one?  What kind of amplitude 
> am I looking at for the parts I am dealing with?  This isn't exactly 
> jewelry cleaning here.  I am dealing with about 250 pounds of iron and a 
> rust-joined surface area of about 12 square inches, buried in a 4" thick 
> joint.  Picture a 2" diameter bolt screwed in 4" deep and left to rust for 
> years.
>
> PGH
> ----- Original Message ----- 
> From: "Andrew Vida" <osan at netlabs.net>
> To: <mspencer at tallships.ca>; "Sponsored by ABANA" 
> <theforge at mailman.qth.net>
> Sent: Sunday, January 20, 2008 12:03 PM
> Subject: Re: [TheForge] Re: Free the Stake!
>
>
>>
>>
>> Mike Spencer wrote:
>>>> I wonder what an ultrasonic driver combined with electrolytic cleaning 
>>>> would do?...pf
>>>
>>> I once prevailed upon a museum friend to agree that his lab might *just
>>> possibly* be willing to ultrasonically clean something for me.  Then I
>>> learned that their sonicator was a water tank something like 3"x3"x10".
>>>
>>> I haven't kept up so I dunno if bigger and more powerful units are now
>>> commonplace or not.
>>
>>    They have been for decades.  When I worked as a pattern maker in 
>> college, the casting houses (jewelry) all had large, high amplitude 
>> ultrasonic cleaners.  These units were impressive, especially when by 
>> accident your hand would go into the water. :)
>>>
>>> I find that electrolysis in warm, dilute phosphoric acid goes faster
>>> than bicarbonate, is less noxious than than HCl and leaves the iron
>>> surface in a more stable -- more rust-resistant -- state.
>>
>>    Probably leaves  phosphate finish, no?
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