There is a danger of corrosion taking place, even in the absence of what are normally called corrosive liquids, when metals are either unplated or inadequately plated. It is not enough to know that a sufficient thickness of metal has been applied. It must be free from pores, cracks, etc., and it is important that the adhesion between the base metal and the plating is of a high order over the whole surface. Other qualities such as appearance and hardness are also of importance in some applications and must not be forgotten. This article outlines methods of testing for plating quality, including such aspects as adhesion, porosity, hardness and lustre.
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