The White Duchess [SEP] material used
The White Duchess
The White Duchess is a life sized (192 x 128 cm) oil-on-canvas painting by the Spanish artist Francisco Goya, completed in 1795 and now in the collection of the Duchess of Alba, Madrid. It portrays María Cayetana de Silva, 13th Duchess of Alba, and is one of a number of portraits Goya painted of her around this time, and is usually compared alongside the similarly sized but tonally very different "Black Duchess", which was painted two years later, just after
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