Corrosion may take a hundred years to be evident. This plaque shows copper turning green as it oxidizes to ions. Iron rusts much faster than copper and crumbles away to dust in a matter of years. Voltaic cells force the electrons involved in spontaneous corrosion reactions through external wires to generate electricity. Electrolysis uses electricity to force metals into nonspontaneous reactions at the electrodes. Heavily corroded cannon pulled from the sea can benefit from electrolytic restoration.
Thursday, September 24, 2009
Corrosion
Corrosion may take a hundred years to be evident. This plaque shows copper turning green as it oxidizes to ions. Iron rusts much faster than copper and crumbles away to dust in a matter of years. Voltaic cells force the electrons involved in spontaneous corrosion reactions through external wires to generate electricity. Electrolysis uses electricity to force metals into nonspontaneous reactions at the electrodes. Heavily corroded cannon pulled from the sea can benefit from electrolytic restoration.
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