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Update -- Rust Removal for the Little Stuff
I have found that electrolysis is the best way to rid large chunks of metal -- plane bodies and froggies for example -- of rust.
But what about the little stuff? All those screws, knobs, and the like that hold the plane together?
Well, here's one solution I've come up with.
Supplies:
1 quart-sized glass jar with lid
1 cup powdered citric acid
2 cups white vinegar
some rusty bits and pieces of planes -- washed to remove grease and big chunks of junk
Dump the citric acid and vinegar into the jar, screw on lid, shake vigorously for a few seconds.
Add rusty stuff
Replace lid, but do not tighten all the way, as this will produce a bit of gas. (I have no idea if the gas would/could ever build up enough pressure to burst the jar, but I think it's better not to take chances, as this stuff would make a pretty gross mess to clean up.)
Set jar aside for several days.
On the subject of cleaning saws
One warning if you clean saws with electrolysis. Electrolysis creates hydrogen and it gets into the steel of the saw and can cause a phenomena called hydrogen embrittlement. This is exactly what it sounds like, though it is reversible. As a gas, the hydrogen will slowly remove itself by gaseous diffusion. Think of it as evaporting though obviously gases don't evaporate. You get the idea though. Do NOT sharpen, strike, or use the saw for a few days after electroylsis so that the hydrogen can get out of the steel. If you do, you run the risk of breaking off teeth or cracking the blade. It's a small chance, but it can and does happen. The safer methods of sandpaper and a solvent, citric acid and a solvent, and the trusty old razor blade are preferable to electrolysis for saws.