ASTM-B920 2022

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B920-16(2022) Standard Practice for Porosity in Gold and Palladium Alloy Coatings on Metal Substrates by Vapors of Sodium Hypochlorite Solution

Published By	Publication Date	Number of Pages
ASTM	2022	4

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Categories: 25.220.40 - Metallic coatings, ASTM

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Description

ASTM B920-16-Reapproved2022

Active Standard: Standard Practice for Porosity in Gold and Palladium Alloy Coatings on Metal Substrates by Vapors of Sodium Hypochlorite Solution

ASTM B920

Scope

1.1 This test practice covers equipment and methods for revealing the porosity of gold and palladium coatings, particularly electrodeposits and clad metals used on electrical contacts.

1.2 This test practice is suitable for coatings containing gold or 75 % by mass of palladium on substrates of copper, nickel, and their alloys, which are commonly used in electrical contacts.

1.3 A variety of full porosity testing methods is described in the literature.2^,3 These porosity Test Methods are B735, B741, B798, B799, and B809. An ASTM Guide to the selection of porosity tests for electrodeposits and related metallic coatings is available as Guide B765.

1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

1.5 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. For specific hazards, see Section 6.

1.6 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.

Keywords

electrical contacts; gold coatings; gold platings; hypochlorite; palladium coatings; palladium platings; plated contacts; plating porosity; pore corrosion test; pore counting; porosity screen testing; porosity testing;

ICS Code

ICS Number Code 25.220.40 (Metallic coatings)

DOI: 10.1520/B0920-16R22

Additional information

Standard Title	B920-16(2022) Standard Practice for Porosity in Gold and Palladium Alloy Coatings on Metal Substrates by Vapors of Sodium Hypochlorite Solution
Published Code	ASTM
Publication Date	2022
Pages Count	4
ICS Codes	25.220.40 - Metallic coatings