Chemical surface corrosion, usually conducted in a controlled fashion on a polished surface of a material sample to reveal details of the microstructure or to selectively remove any material not protected by a resist using an appropriate solvent or acid.

In some cases the unwanted material is removed using an electrolytic process.

Electrolyte cell showing electron flow and copper ion into and out of solution.

The surface to be etched using electrolysis is connected to the positive (+ve) terminal of the battery or electrical source.

See also: Deep Etching, Electrolysis, Photo Etching.

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Subjects: Mechanical Engineering