Have have used an old copper core stick arc welder. It was a heavy unit on two wheels at the back, about a cubic foot in size. I rectified it using two 45 amp bridge rectifiers in parallel, mounted on a heatsink. We set the welder at the minimum current setting and let it run. Monitor all parts for overheating. We bought the sodium bicarbonate in a 20kg sack. Be aware of hexavalent chromium. Watch Erin Brokovich if you want to learn about that.
Aaron
I've been using white vinegar, overnight soak or a couple of days with heavy rust and an occasional agitation. It seems to do the trick. You can even dip you chips in it while you wait for it to work
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