The anode, or metal to be use for plating, and the cathode, or substrate to be plated, are immersed in a salt medium such as alkali metal halide. Silver (anode) is deposited on jewelry located on the cathode (substrate), for example, in silver electroplating. The metal to be plated dissolves in molten salt, and the solvent facilitates the plating process. The electrical charge (current passed through the solvent for a given time) determines the coating thickness. The uniformity of coating is influenced by the anode cathode geometry. The coating does not become part of the substrate in electrodeposition; however, at elevated temperatures the coating and substrate interdiffuse with each other.
Types of protective layers and coatings based on electroplating include metallic, multilayered, alloy, composite, conversion, anodized and electroforming. Metals such as gold and silver, for example, can be used for metallic coatings. Several layers of materials such as copper and nickel are deposited in multilayered coatings. Alloys mixture of metals such as tin and lead can also be used for coatings. Composites, materials with different ingredients such as cobalt and chromium carbide, are used for specific coating applications. Conversion coatings have oxide, phosphate or chromate surfaces that provide improved corrosion resistance. A metal such as aluminum is used as the anode in anodized coatings, which are widely used in the food packaging and processing industry. Electroforming is a popular technique for jewelry making. Electroplating is a process that covers a metal object with a thin layer of another metal. Reasons for electroplating.
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