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Working with a rapid method to convert iron to rust

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I'm working on an experiment that requires the rapid (minutes rather than days) conversion of Iron into red rust (Fe2O3) WITHOUT using heat as a catalyst. The reverse reaction (also without heat as a catalyst) would also be helpful.

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Iron (plate or block) (Fe)
Sodium chloride (NaCl)
Power source (9-24V DC)

9-30V transformer capable to give 5-20A will be enough in this experiment. Current should be rectified.

Prepare a water solution of NaCl. Use 100 g NaCl for every liter of water. Concentration of salt depends on ammount of current you want to run through solution. Current also depends on distance between electrodes and their size. It is usually more ...

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