Burnishing

A chemical surface-coating process in which iron and steel parts are dipped in heated oxidizing solutions to form dark brown to black iron-oxide layers that are decorative and give limited corrosion protection.
Photograph of an industrial burnishing plant with a gantry hoist above a row of open treatment tanks and a wire basket of parts in a tiled room.

Burnishing is a chemical process for the coating of material surfaces.

Dipping iron and steel parts in heated oxidizing solutions produces layers of iron oxide (Fe3O4) which are dark brown to black in color.

In addition to its decorative effect, burnishing also provides limited protection from corrosion.

See Also

Adapted from “"We do it straight" — Wire Straightening”, p. 35 (ISBN 3-00-005897-4).

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