Electroplating and Related Processes

Electroplating is achieved by passing an electric current through a solution containing dissolved metal ions as well as the metal object to be plated. The metal object acts as a cathode in an electrochemical cell, attracting metal ions from the solution. Ferrous and nonferrous metal objects are typically electroplated with aluminum, brass, bronze, cadmium, chromium, copper, iron, lead, nickel, tin, and zinc, as well as precious metals such as gold, platinum, and silver. Common electroplating bath solutions are listed in Table 7-1. [Pg.49]

The sequence of unit operations in an electroplating operation is very similar when either racks or barrels are used to carry parts. A typical sequence involves various types of cleaning steps, stripping of old plating or paint, the actual electroplating steps, and rinsing steps between and after each of the above operations. [Pg.49]

Electroless plating uses similar steps, but involves the deposition of metal on a metallic or non-metallic surface without the use of external electrical energy. [Pg.49]

The electroplating process is sometimes used to build up a thick coating of metal on a mandrel or mold. In this process, called electroforming, the mandrel is removed once the buildup is complete. Electroforming can produce intricate shapes whose dimensions and surface textures can be reproduced with great fidelity and detail. [Pg.49]

In electropolishing, the metal workpiece is made the anode rather than the cathode. Instead of deposition onto the surface of the workpiece, some of the metal dissolves, leaving a bright, polished surface. High points dissolve at a faster rate than recessed areas. Electropolishing is performed to improve adhesion of subsequent electroplates, to deburr and Finish parts, and for decorative purposes (Schaer 1971). [Pg.49]

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