[GreenKeys] Rust Removers: Experience?

[Richard Knoppow]

     Almost all or maybe all of these rust removers use one of about 
four ingredients that are classified in chemistry as reducing agents. 
The reduce the state of oxidation of metals toward the original metal. 
Photographic developers are reducing agents of a special kind.
     Those that seem most often used to remove rust are:
Phosphoric acid, used in Naval Jelly. Also used as a flavoring agent in 
some soft drinks like cola drinks.
      Oxalic acid, found in Barkeeper's Friend and Zud
     Citric acid (found in lemon juice). Tarn-X uses a form of citric acid.
For more about these see:
http://hubpages.com/technology/Rust-removal-by-chelation
Another form of Tarn-x uses acidified thiourea. A patent for a thiourea 
rust remover appears here
https://www.google.com/patents/US20040102344
and another here
https://www.google.com/patents/US4381249

    Any of these methods can cause considerable damage to objects being 
treated.  Probably those using oxalic acid are least damaging.
    The first link suggests soaking in a solution of molasses. It is 
very slow but will not damage things and evidently works well.
     One can find much more on the web.




On 11/9/2016 11:41 AM, Ed Sharpe Archivist for SMECC via GreenKeys wrote:
>  RUST AWAY - RUST AWAY STAIN REMOVER 16 OZ.
>> This stuff is a gel - you apply then wipe or wash off later.
>
> Eric  I had  some  like this different  name (  39years ago can not
> remember)
> but had a rusty old  xray machine  stand I mage into a  camera monopole
> in  my  photo studio
> ( what I did  before the computer biz)
> it  worked well...  that active ingredient was  phosphoric acid
>
> Ed Sharpe
>
>
> In a message dated 11/9/2016 11:47:20 A.M. US Mountain Standard Time,
> epvgk at limpoc.com writes:
>
>     Evapo-rust works great just by immersion overnight. It will remove
>     protective
>     treatments like parkerizing, bluing, etc which can result in treated
>     parts
>     becoming more prone to rusting again afterward.
>
>     As far as removing rust, they all work but the gel ones (phosphoric
>     acid I think)
>     are more work and probably no better no better in performance.
>
>     eric
>
>
>
>     On Wed, Nov 09, 2016 at 01:32:47PM -0500, Roy Morgan wrote:
>     > Greenkeyers,
>     >
>     > Some time ago, there were posts on the list about the use of "Rust
>     Away" or
>     > some similarly-named product, with very good results reported and
>     advice on
>     > use offered.
>     >
>     > I recently got a Unimat LS-1000 miniature lathe and need to
>     de-rust most of
>     > the parts. My memory may be weak, but I looked in auto parts stores,
>     > hardware stores, and on the Web, for "Rust- Away".  I found only
>     Evapo-Rust
>     > in one store, which I did buy.
>     >
>     > I did find online this:
>     > RUST AWAY - RUST AWAY STAIN REMOVER 16 OZ.
>     > This stuff is a gel - you apply then wipe or wash off later.
>     > This web-site tells about some available products, including
>     Evapo-Rust,
>     > but not the one I remember:
>     > https://www.theruststore.com/Rust-Remover-Comparison-Chart-W22.aspx
>     >
>     > What experience have list members had?
>     > Products? Results? Advice?
>     >
>     > (I also need sources for drive belts for this wonderful small lathe.)
>     >
>     > Thanks much,
>     >
>     > --
>     > Regards,
>     > Roy
>     >
>     > Roy Morgan
>     > k1lky since 1958
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL