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TOPIC: Rust removal by electrolosis

Rust removal by electrolosis 09 Nov 2012 18:04 #1

  • Jack Evers
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Just got a bit interested in this process for cleaning old rusty tools as in yard sales, auctions, etc.. Most of ours can probably be cleaned up with brushing, but more complex stuff like a wood working plane is tough. This only removes rust and none of the base metal like grinding or sanding will. There are a ton of references to be googled so here's one that also explains the chemistry.
www.rickswoodshopcreations.com/miscellaneous/rust_removal.htm
I might mention that washing soda (Na2Co3) isn't all that easy to find, but Sodium Bi Carbonate - baking soda (NaHCo3), will work or can be converted to washing soda by putting it in the oven at 400 degrees for a 1/2 hour or so.

My first try was a mildly rusted wrench, a very rusted wrench and an old shoe that had been lying behind my shop for several years - really rusted. Here's the before and after.
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Jack Evers CJF AFA#426

The best things about the good old days -- I wasn't good and I wasn't old.

The older I get, the more horses I shoe, the fewer things that I can absolutely, positively fix.
Last Edit: 09 Nov 2012 19:30 by Jack Evers.
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The following user(s) said Thank You: Travis Morgan

Rust removal by electrolosis 01 Jun 2013 12:18 #2

  • Frank Turley
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Another route to go that I learned at a museum working with small gun parts, was to use a caustic soda (lye) solution. We had a large glass beaker and would mix about 20% lye by volume with water. It is dangerous and gets warm. We stirred it with a wooden stick. Not to touch or spill! The rusty pieces were placed in the solution and zinc powder was sprinkled on top of the solution. The zinc trickled to the bottom and you could see the superficial rust being lifted by the reaction. The pieces were retrieved with tongs and rinsed thoroughly with water.

This was a doable method in a museum conservation lab under a fume cabinet. I don't necessarily recommend having lye stored in a home situation, especially where children are present.
Frank Turley
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