My children attempted this experiment last weekend, and I made them walk me through their process.
Purpose: To see if rust would pull off the axle with electrolysis.
Materials: water, baking soda, steel rods, clamps, bucket, battery charger, wires
Procedure: Attach rods to the inside of the bucket and connect them with electrical wires. Place axle in bucket. Add 4 gallons of water to bucket to cover half of axle. Add 4 tablespoons of baking soda. Hook up battery -- positive lead to the steel rods and negative lead to the axle. Turn on electrical current. Wait 24 hours.
Observations: Water bubbled. Rods began to attract rust. Water filled with rust. Could see the portion of the axle in the water being cleaned.
Conclusion: Removed some rust, but not all.
Factors That Could Be Changed for More Success: Submerge axle fully. Use more baking soda. Use more wire and rods. Use higher battery charge.
[The left side is the side that was submerged because it is lighter in color and more recently exposed to oxygen. You are seeing the sub-layers of rust that haven't been exposed to oxygen in many years.]
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