Below is a list of Cadmium Plating manufacturers from Philadelphia, Pennsylvania. Cadmium plating is the process of depositing a thin, uniform layer of cadmium onto another substrate, such as a metal or plastic workpiece. Cadmium (Cd) is a bluish-white metallic chemical element that features similar properties as the more well-known chemicals zinc and mercury. Not considered to be a member of the transition metals group, cadmium is a fairly abundant element with a comparatively low melting point.