Electroplating
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-375
2025-12-11
38
is the process of coating one metal with another by means of the electric current.. The article to be coated is the cathode of the cell and is coupled to the anode of a battery. Copper may be deposited from a bath of copper sulphate, silver from one of the double cyanide of silver and potassium, nickel from one of nickel ammonium sulphate. Nickel plating is used to protect from oxidation articles made of brass, iron, or steel.
In commercial electroplating the electrolyte is in a large tank along each side of which runs a heavy copper rod. The articles to be plated are suspended from one rod, and a plate of the metal to be deposited, from the other. A dynamo that gives a heavy current and low voltage is used, the current being sent through the tank from the metal plate to the articles to be plated. These articles must be chemically clean on the surface. The necessary potential difference at the two rods varies with the metals deposited.
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