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ASTM B679-98(2009)

(Specification)

Standard Specification for Electrodeposited Coatings of Palladium for Engineering Use

Standard Specification for Electrodeposited Coatings of Palladium for Engineering Use

ABSTRACT
This specification establishes the requirements for electrodeposited palladium coatings for use in engineering applications. This specification also covers composite coatings of palladium with a thin gold overplate for applications involving electrical contacts. The plating system shall indicate the basis metal involved, thickness of the underplates, thickness of the palladium coating, and grade of the gold overplate. Coatings shall be sampled, tested, and conform accordingly to specified requirements as to purity, appearance, thickness, dutility, adhesion (to be examined either by bend, heat, or cutting test), and integrity (gross defects, mechanical damage, and porosity).
SCOPE
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).
  Approximate Hardness (HK25) Gold50–250 Palladium75–600 Platinum150–550 Palladium-Nickel300–650 Rhodium750–1100 Ruthenium600–1300
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.

General Information

Status
Historical
Publication Date
31-Aug-2009
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.04 - Precious Metal Coatings
Current Stage
Ref Project

Relations

Replaces
ASTM B679-98(2004)e1 - Standard Specification for Electrodeposited Coatings of Palladium for Engineering Use
Effective Date
01-Sep-2009
Referred By
ASTM B866-95(2018) - Standard Test Method for Gross Defects and Mechanical Damage in Metallic Coatings by Polysulfide Immersion
Effective Date
01-Sep-2009
Referred By
ASTM B877-96(2018) - Standard Test Method for Gross Defects and Mechanical Damage in Metallic Coatings by the Phosphomolybdic Acid (PMA) Method
Effective Date
01-Sep-2009
Referred By
ASTM B984-12(2020)e1 - Standard Specification for Electrodeposited Coatings of Palladium-Cobalt Alloy for Engineering Use
Effective Date
01-Sep-2009

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ASTM B679-98(2009) - Standard Specification for Electrodeposited Coatings of Palladium for Engineering UseASTM B679-98(2009) - Standard Specification for Electrodeposited Coatings of Palladium for Engineering Use
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ASTM B679-98(2009) - Standard Specification for Electrodeposited Coatings of Palladium for Engineering Use
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:B679 −98(Reapproved2009)
Standard Specification for
Electrodeposited Coatings of Palladium for Engineering
1
Use
This standard is issued under the fixed designation B679; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 Thisspecificationcoversrequirementsforelectrodepos- 2.1 Thefollowingstandardsformapartofthisspecification
ited palladium coatings containing at least 99.7 mass % of to the extent referenced herein:
palladium metal. Composite coatings consisting of palladium 3
2.2 ASTM Standards:
with a thin gold overplate for applications involving electrical
B183Practice for Preparation of Low-Carbon Steel for
contacts are also covered.
Electroplating
1.2 Properties—Palladium is the lightest and least noble of B242Guide for Preparation of High-Carbon Steel for Elec-
the platinum group metals. It has a specific gravity of 12.0, troplating
which is substantially less than gold (19.3) and platinum B254Practice for Preparation of and Electroplating on
(21.5). This yields a greater volume or thickness of coating Stainless Steel
and, consequently, some saving of metal weight accompanied B281Practice for Preparation of Copper and Copper-Base
byasmallsacrificeincorrosionresistanceandreflectivity.The Alloys for Electroplating and Conversion Coatings
following table compares the hardness range of electrodepos- B322Guide for Cleaning Metals Prior to Electroplating
ited palladium with other electrodeposited noble metals and B343Practice for Preparation of Nickel for Electroplating
2
alloys (1,2). with Nickel
B374Terminology Relating to Electroplating
Approximate Hardness (HK )
25
Gold 50–250
B481Practice for Preparation of Titanium and Titanium
Palladium 75–600
Alloys for Electroplating
Platinum 150–550
B482Practice for Preparation of Tungsten and Tungsten
Palladium-Nickel 300–650
Rhodium 750–1100
Alloys for Electroplating
Ruthenium 600–1300
B487Test Method for Measurement of Metal and Oxide
1.3 The values stated in SI units are the preferred values.
Coating Thickness by Microscopical Examination of
Values provided in parentheses are for information only.
Cross Section
B488Specification for Electrodeposited Coatings of Gold
1.4 This standard does not purport to address all of the
for Engineering Uses
safety concerns, if any, associated with its use. It is the
B489Practice for Bend Test for Ductility of Electrodepos-
responsibility of the user of this standard to establish appro-
ited and Autocatalytically Deposited Metal Coatings on
priate safety and health practices and determine the applica-
Metals
bility of regulatory limitations prior to use.
B499Test Method for Measurement of CoatingThicknesses
by the Magnetic Method: Nonmagnetic Coatings on
1
This specification is under the jurisdiction of ASTM Committee B08 on
Magnetic Basis Metals
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
B08.04 on Precious Metal Coatings.
Current edition approved Sept. 1, 2009. Published November 2009. Originally
ε1 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
approved in 1980. Last previous edition approved in 2004 as B679–98(2004) .
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
DOI: 10.1520/B0679-98R09.
2
Standards volume information, refer to the standard’s Document Summary page on
Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof
the ASTM website.
this specification.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B679−98(2009)
A
TABLE 1 Thickness Class
B507Practice for Design ofArticles to Be Electroplated on
Thickness Class Minimum Thickness of Pd (µm)
Racks
0.08 0.08
B542Terminology Relating to Electrical Contacts andTheir
0.15 0.15
Use
0.25 0.25
B558Practice for Preparation of Nickel Alloys for Electro-
0.50 0.50
0.75 0.75
plating
1.00 1.00
B567Test Method for Measurement of Coating Thickness
1.25 1.25
by the Beta Backscatter Method
1.5 1.5
2.5 2.5
B568Test Method for Measurement of Coating Thickness
3.0 3.0
by X-Ray Spectrometry
5.0 5.0
B571Practice for Qualitative Adhesion Testing of Metallic
A
See Appendix X4 for specific applications of the various thickness classes.
Coatings
B602Test Method for Attribute Sampling of Metallic and
A
Inorganic Coatings
TABLE 2 Gold Overplate
B689Specification for Electroplated Engineering Nickel
Thickness
Grade Type MIL-G-45204 Hardness (Code)
Coatings Range
0 No Overplate . . . . . . . . .
B697Guide for Selection of Sa
...

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