Electroplating is the application of electrolytic cells which a thin layer of metal is deposited onto an electrically conductive surface.
why electroplating is done?
there are several reasons why we want to coat a conductive surface with a metal. silver plating and gold plating of jewelry or silver ware typically done to improve the appearance and value of the items. chromium plating improves the appearance of objects and also improves its wear. zinc or tin coating may be applied to confer corrosion resistance. sometimes, electroplating is done simply to increases the thickness of an item.
how electroplating works??
electroplating works like galvanic cells in reverse. an electrical current reduces cations from a solution so that they can coat a conductive material with a thin layer.
A closer look at electroplating.
In one form of electroplating, the metal to be plated is located at the anode of the circuit, with the item to be plated located at the cathode. both the anode and the cathode are immersed in a solution which contains a dissolved metal salts and other ions which act to permit the flow of electricity through the circuit. direct current is applied to the anode, oxidizing its metal atoms and dissolving them in the electrolyte solution.the dissolved metal ions are reduced at the cathode, plating the metal onto the item. the current through the circuit is such that the rate at which the anode is dissolved is equal to the rate at which the cathode is plated.
here are some link that showed some animation of electroplating process. do not hesitate to click to the link ok.. (^_^)
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