Study of effect of metal coupling on the rusting of iron
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Rusting can be explained by by an electro-chemical mechanism. In the presence of moist air containing dissolved oxygen or carbon dioxide, the commercial iron behaves as if composed of small electrical cells. At anode of cell, iron passes into solution as ferrous ions. The electron moves towards the cathode and form hydroxyl ions. These ferrous ions and hydroxyl ions interact to form hydrated ferric oxide.
Metal coupling effects the rusting of iron. If the nail is coupled with a more electro-positive metal like zinc, magnesium or aluminium, rusting can be prevented but on the other hand if it is coupled with a less electro-positive metals like copper, rusting is facilitated.
Metal coupling effects the rusting of iron. If the nail is coupled with a more electro-positive metal like zinc, magnesium or aluminium, rusting can be prevented but on the other hand if it is coupled with a less electro-positive metals like copper, rusting is facilitated.
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