ASTM-B679 2009

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B679-98(2009) Standard Specification for Electrodeposited Coatings of Palladium for Engineering Use

Published By	Publication Date	Number of Pages
ASTM	2009	6

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Categories: 25.220.40 - Metallic coatings, ASTM

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Description

1.1 This specification covers requirements for electrodeposited palladium coatings containing at least 99.7 mass % of palladium metal. Composite coatings consisting of palladium with a thin gold overplate for applications involving electrical contacts are also covered.

1.2 Properties Palladium is the lightest and least noble of the platinum group metals. It has a specific gravity of 12.0, which is substantially less than gold (19.3) and platinum (21.5). This yields a greater volume or thickness of coating and, consequently, some saving of metal weight accompanied by a small sacrifice in corrosion resistance and reflectivity. The following table compares the hardness range of electrodeposited palladium with other electrodeposited noble metals and alloys (1,2) .

1.3 The values stated in SI units are the preferred values. Values provided in parentheses are for information only.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology Classification Ordering Information Manufacture TABLE 1 TABLE 2
3	Coating Requirements Sampling
4	Test Methods Special Government Requirements Keywords
5	X1. SOME REASONS FOR USING A GOLD OVERPLATE X1.1 X1.2 X2. SOME REASONS FOR USING A NICKEL UNDERPLATE FOR PALLADIUM-NICKEL ELECTROPLATING X2.1 Diffusion Barrier X2.2 Levelling Layer X2.3 Pore Corrosion Inhibitor X2.4 Load Bearing Underlayer for Contacting Surfaces X2.5 X3. RESIDUAL SALTS X3.1 X3.2 X3.3 X3.4
6	X4. RECOMMENDED THICKNESSES X4.1 REFERENCES

Additional information

	Approximate Hardness (HK 25 )
Gold	50 250
Ruthenium	600 1300
Rhodium	750 1100
Platinum	150 550
Palladium	75 600
Palladium-Nickel	300 650
ICS Codes	25.220.40 - Metallic coatings

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ASTM-B679 2009

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