Why Use Internal Anodes
When plating thicknesses of electrolytic coatings are of high importance on internal surfaces (cavities/bores etc), the use of an internal anode may be the only choice an engineer has.
Without the use of a supplementary anode you could typically expect a plating thickness ratio of 1:5 from internal to external surfaces on a cavity as small as 70mm in length. This ratio will increase if the cavity is longer, and at worse case could result in no coatings being deposited. Therefore the internal anode will alter the current distribution in electroplating and give a more uniform thickness throughout a cavity.
SGA have experience in designing jigs which maximise the properties of using an internal anode. These fixtures will ensure a smooth, homogenous internal coating, similar in thickness, performance and appearance to that externally.