ASTM B679-98(2021)

ASTM B679-98(2021) - 1.10.2021

1. 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?PropertiesPalladium 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).2

Approximate Hardness (HK₂₅)

Gold

50250

Palladium

75600

Platinum

150550

Palladium-Nickel

300650

Rhodium

7501100

Ruthenium

6001300

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

2. Referenced Documents

D3951-18(2023)	Standard Practice for Commercial Packaging
B602-21	Standard Guide for Attribute Sampling of Metallic and Inorganic Coatings
B499-09(2021)e1	Standard Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals (Includes all amendments and changes 5/18/2021).
B254-92(2020)e1	Standard Practice for Preparation of and Electroplating on Stainless Steel (Includes all amendments and changes 12/7/2020).
B489-85(2023)	Standard Practice for Bend Test for Ductility of Electrodeposited and Autocatalytically Deposited Metal Coatings on Metals
B488-18	Standard Specification for Electrodeposited Coatings of Gold for Engineering Uses
B481-68(2019)	Standard Practice for Preparation of Titanium and Titanium Alloys for Electroplating
B507-14(2021)	Standard Practice for Design of Articles to Be Electroplated on Racks
B542-13(2019)	Standard Terminology Relating to Electrical Contacts and Their Use
B568-98(2021)	Standard Test Method for Measurement of Coating Thickness by X-Ray Spectrometry
B689-97(2023)	Standard Specification for Electroplated Engineering Nickel Coatings
B697-88(2021)	Standard Guide for Selection of Sampling Plans for Inspection of Electrodeposited Metallic and Inorganic Coatings
B765-03(2023)	Standard Guide for Selection of Porosity and Gross Defect Tests for Electrodeposits and Related Metallic Coatings
B482-85(2019)	Standard Practice for Preparation of Tungsten and Tungsten Alloys for Electroplating
B487-20	Standard Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section
B374-21	Standard Terminology Relating to Electroplating
B343-92a(2020)	Standard Practice for Preparation of Nickel for Electroplating with Nickel (Includes all amendments and changes 12/4/2020).
B322-99(2020)e1	Standard Guide for Cleaning Metals Prior to Electroplating (Includes all amendments and changes 12/7/2020).
B567-98(2021)	Standard Test Method for Measurement of Coating Thickness by the Beta Backscatter Method
B558-79(2019)	Standard Practice for Preparation of Nickel Alloys for Electroplating
B281-88(2019)e1	Standard Practice for Preparation of Copper and Copper-Base Alloys for Electroplating and Conversion Coatings (Includes all amendments and changes 5/14/2019).
B183-18(2022)	Standard Practice for Preparation of Low-Carbon Steel for Electroplating
D1125-23	Standard Test Methods for Electrical Conductivity and Resistivity of Water
B809-95(2018)	Standard Test Method for Porosity in Metallic Coatings by Humid Sulfur Vapor (“Flowers-of-Sulfur”)
B242-99(2020)	Standard Guide for Preparation of High-Carbon Steel for Electroplating
B799-95(2020)	Standard Test Method for Porosity in Gold and Palladium Coatings by Sulfurous Acid/Sulfur-Dioxide Vapor
B762-21	Standard Guide of Variables Sampling of Metallic and Inorganic Coatings
B741-95(2000)	Standard Test Method for Porosity In Gold Coatings On Metal Substrates By Paper Electrography (Withdrawn 2005)
B571-23	Standard Practice for Qualitative Adhesion Testing of Metallic Coatings
B748-90(2021)	Standard Test Method for Measurement of Thickness of Metallic Coatings by Measurement of Cross Section with a Scanning Electron Microscope