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ASTM B867-95(2008)

Historical Reaffirmation

Standard Specification for Electrodeposited Coatings of Palladium-Nickel for Engineering Use

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1.1 CompositionThis specification covers requirements for electrodeposited palladium-nickel coatings containing between 70 and 95 mass % of palladium metal. Composite coatings consisting of palladium-nickel and a thin gold overplate for applications involving electrical contacts are also covered.

1.2 PropertiesPalladium is the lightest and least noble of the platinum group metals. Palladium-nickel is a solid solution alloy of palladium and nickel. Electroplated palladium-nickel alloys have a density between 10 and 11.5, which is substantially less than electroplated gold (17.0 to 19.3) and comparable to electroplated pure palladium (10.5 to 11.8). This yields a greater volume or thickness of coating per unit mass and, consequently, some saving of metal weight. The hardness range of electrodeposited palladium-nickel compares favorably with electroplated noble metals and their alloys (1, 2).

Note 1—Electroplated deposits generally have a lower density than their wrought metal counterparts.

Approximate Hardness (HK25)
Gold 50250
Palladium 75600
Platinum150550
Palladium-Nickel300650
Rhodium 7501100
Ruthenium6001300

1.3 The values stated in SI units are to be regarded as the standard. The values given 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.

This specification establishes the requirements for electrodeposited palladium-nickel (Pd-Ni) coatings for engineering applications. Composite coatings consisting of palladium-nickel and a thin gold over-plate for applications involving electrical contacts are also covered. The classification system for the coatings covered here shall be specified by the basis metal, the thickness of the underplating, the composition type and thickness class of the palladium-nickel coating, and the grade of the gold overplating. Coatings should be sampled, tested, and conform to specified requirements as to purity, appearance, thickness, composition, adhesion, ductility, and integrity (including gross defects, mechanical damage, porosity, and microcracks). Alloy composition shall be examined either by wet method, X-ray fluorescence (XRF), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Auger or electron probe X-ray microanalysis (EPMA), or wavelength dispersive spectroscopy (WDS). Coating adhesion shall be analyzed either by bend, heat, or cutting test.


SDO ASTM: ASTM International
Document Number B867
Publication Date Aug. 1, 2008
Language en - English
Page Count 10
Revision Level 95(2008)
Supercedes
Committee B08.03
Publish Date Document Id Type View
Jan. 1, 1995 B0867-95 Revision
Nov. 1, 2023 B0867-95R23 Reaffirmation
June 1, 2018 B0867-95R18 Reaffirmation
Dec. 1, 2013 B0867-95R13 Reaffirmation
Aug. 1, 2008 B0867-95R08 Reaffirmation
Feb. 10, 2003 B0867-95R03 Reaffirmation