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electroplating

noun

Definition

  1. The deposition of a metallic coating onto an object by putting a negative charge onto the object and immersing it into a solution which contains a salt of the metal to be deposited. The metallic ions of the salt carry a positive charge and are attracted to the part. The negatively charged part provides the electrons needed to reduce the positively charged ions to metallic form.

External Source

http://en.wikipedia.org/wiki/electroplating