Charlotte Medal [SEP] material used
Charlotte Medal
The Charlotte Medal is a silver medallion wide, depicting the voyage of the "Charlotte", with the First Fleet, to Botany Bay, Australia. Its obverse depicts a scene of the ship and its reverse is inscribed with a description of the journey. The medal is said to be the first work of Australian colonial art.
Creation.
During the journey the Charlotte visited Rio de Janeiro. Whilst at anchor, one of the ship's convicts, a forger and mutineer by the name of Thomas
to cathodically protect metals that are exposed to sea water. A zinc disc attached to a ship's iron rudder will slowly corrode while the rudder stays intact. Similarly, a zinc plug attached to a propeller or the metal protective guard for the keel of the ship provides temporary protection.
With a standard electrode potential (SEP) of −0.76 volts, zinc is used as an anode material for batteries. (More reactive lithium (SEP −3.04 V) is used for anodes in lithium batteries ). Powdered zinc is used in