I need to tell you guys that there is one concern here that has not been addressed regarding use of electricity to derust parts. There is a phenomenon called Hydrogen Embrittlement, and it is of some concern, particularly when we're talking about the derusting of fasteners, car springs and other iron laden parts that are under stress in their intended application. When an iron or steel artifact is treated using electrolysis it becomes surrounded by hydrogen bubbles. In fact if you put a plastic bag over the top of your bucket you will catch hydrogen gas escaping from the water as a result of the excited atoms from the electrical current. Hydrogen is very explosive, so you don't want to do this around your gas water heater. Back to embrittlement issues. This electrolysis of rust removal using this method allows the hydrogen ions to penetrate the iron lattice where they recombine to form molecular hydrogen. This takes up more space within the iron and tends to stretch the individual grains or crystals of iron apart resulting in the part becoming (possibly) brittle.Over time, the absorbed hydrogen will excape back into the atmosphere, but the theory is that the metallic structure has already been weakened by the stretching of the metal by the hydrogen. All this could lead to failure of the bolt or part.