Cal-Aurum: Rodium Plating Specifications

Rhodium plating of metallic parts is intended to protect articles from corrosion, prevent galling of sliding electrical contacts, furnish a highly decorative finish and provide a mirror surface which is highly reflective and non-tarnishing. Almost as hard as Chromium, color is similar to stainless steel.

Specification: MIL-R-46085 Rhodium Plating, Electrodeposited (This spec has been canceled, but is still in wide use.)

Thickness Classes:	1	0.000002", minimum
	2	0.00001", minimum
	3	0.00002", minimum
	4	0.00010", minimum
	5	0.00025", minimum

Specification: ASTM B 634 Electrodeposited Coatings of Rhodium for Engineering Use

Thickness Classes:	0.05	0.05µm
	0.25	0.25µm
	0.5	0.50µm
	2.5	2.50µm
	6.2	6.20µm

Specification: AMS 2413 Silver And Rhodium Plating

Covers engineering requirements.

About Undercoating: Surfaces other than nickel, silver, gold, or platinum should be nickel plated (or nickel over copper plated as applicable). An underplating of nickel should be used when parts are of corrosion or heat resistant steels.

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