Metal plating is the process of electrochemically bonding
one metal onto another metal to give the resultant surface certain engineering
characteristics. The most common goal of metal finishing is corrosion
protection. The plated metal will offer either galvanic protection, meaning it
will corrode preferentially to the metal it is protecting, or encapsulation,
meaning it serves as an inert barrier between the corrosive environment and the
base metal. The second most common goal of metal finishing is wear protection.
The plated metal is either harder than the base material or has a lower
coefficient of friction, thereby preserving it from material loss, overheating,
deformation or other damage caused by wear. Finally, metal plating can
improve the appearance of the base material, but one or both of the
aforementioned engineering characteristics (corrosion and/or wear protection)
are usually sought as well.
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