Electrolysis & Metals

Electrolysis can be used to remove layers of rust or old paint from metals. This method is useful when you are restoring old coins or jewelry or removing rust from frozen bolts. Electrolysis involves passing an electric current through an electrolyte; the result is a movement of charged ions from one electrode to the other. In this process, the rust (Fe2O3) is chemically converted to iron, releasing oxygen and hydrogen. Electrolysis works best with iron, but can work with any metal that can conduct electricity. It should be noted that some metals, like aluminum, will disintegrate faster than others. CAUTION: This project can be dangerous; take all precautions to ensure your safety.

Things You'll Need

• Plastic bucket
• Battery charger
• Rebar
• Electrolyte
• Safety glasses
• Safety gloves

Show More

Instructions

• 1

  Add 1/3 cup detergent (Arm & Hammer washing soda) with 5 gallons of water in a plastic bucket or other non-conductive container (do not use metal) and mix thoroughly. The process releases gases, so it is important to work in a well-ventilated area.

• 2

  Connect one electrode (rebar) to positive lead (anode) from a 12v battery charger (The red lead from the battery charger is the positive node.) Hold it into placem ensuring that it does not touch the side or bottom of the bucket.

• 3

  Connect the negative lead (cathode) from the DC source to the material that needs to be cleaned.

• 4

  Double-check all connections, making sure nothing is touching; the electrodes should not be touching each other, nor should they be touching the sides or the bottom of the bucket. Make sure you have enough electrolyte solution to cover the part being cleaned.

• 5

  Turn on the power. Bubbles will immediately form on the surface; this is hydrogen (from the cathode) and oxygen (from the anode) being released.

• 6

  Turn off the power once the electrolysis process is done. Wash the remaining residue off the part or object being cleaned; you can do this with a brush.