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Note added at 12 hrs (2015-05-19 00:18:18 GMT)
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Barrel plating is one of the most common types of electroplating processes. During electroplating, manufacturers use an electric current to transfer metal ions from a source material to another object. The metal ions form a protective coating on the new object, giving it new or enhanced properties, such as water resistance or corrosion resistance. One example is using zinc to coat steel, resulting in galvanized steel, which offers a much higher level of moisture resistance than uncoated steel.
http://www.wisegeek.com/what-is-barrel-plating.htm
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Barrel plating is a cost-effective solution that allows for mass finishing of fasteners, small machined parts and small stampings.
http://www.gattoplaters.com/barrel-plating.html

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. Barrel plating line is designed for small parts with high volume. This is the most cost effective manner to plate steel.
http://www.exactinc.com/working/services.htm