Moonrise by the Sea [SEP] material used
Moonrise by the Sea
Moonrise by the Sea or Moonrise over the Sea (German: "Mondaufgang am Meer") is an 1822 oil-on-canvas painting by German painter Caspar David Friedrich. The work depicts a romantic seascape. 
Three young people, two women side by side and a man further back, are sitting on a large boulder by the sea, silhouetted against the sky as they watch the moon rising to the east above a band of clouds. In the distance are two sailing vessels, ghosting
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