Common Metal Finishing Processes

Metal finishing covers a wide-array of processes applied particularly by metal parts manufacturing industries. This procedure is usually performed after a metal part has been formed by altering the surface of a workpiece using common metal finishes like paint, ceramic coatings, and other surface treatments.

The following provides a brief description of the process involved in metal finishing:

Electroplating

This process is obtained by passing an electric current through a dissolved metal ions-containing solution and the metal object to be treated. The metal object serves as the cathode in an electrochemical cell which attracts ions from the solution. Metals like aluminum, brass, bronze, cadmium, copper, chromium, gold, iron, lead, nickel, platinum, silver, tin, and zinc are used in plating ferrous and non-ferrous metal.

The operations involved in metal plating are typically batch operations. Meaning to say, metal objects are submerged into a series of baths that contain various reagents for achieving the needed surface characteristics. Operators can either carry the workpieces on barrels or racks.

Electroless Plating

In electroless plating, the process involves chemical deposition of metal coating onto object using chemical reactions different from the previous one which uses electricity. The basic component of electroless plating solution are a source metal (usually a salt), a reducer, a complexing agent to hold the metal in solution, and other chemicals purposely designed to maintain stability and increase the life of bath.

Immersion Plating

This process is similar to electroless plating as this uses a chemical reaction to apply the coating. The difference is that the reaction is caused not by mixing two chemicals into the plating, but rather by metal substrate. The procedure creates a thin metal deposit by chemical displacement, commonly zinc or silver.

Chemical and Electrochemical Conversion

This metal treatment gives protective and/or decorative coating on a metal surface. This includes processes like anodizing - an immersion process in which the workpiece is put in a solution (usually containing metal salts or acids) where a reaction occurs to form an insoluble metal oxide. The reaction continues and forms a thin, non-porous layer that provides resistance to corrosion.

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About the Author:
Riza Deshpande is an Internet enthusiast who loves to share useful information on electronics and manufacturing industry-related topics. Specifically she wants to share online her knowledge on topics like metal plating and anodizing.

Article Originally Published On: http://www.articlesnatch.com

Tags: metal plating , metal finishing processes , anodizing

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