1.1 This test method covers equipment and procedures for using nitric acid vapor for determining porosity in gold coatings, greater than
0.6 µm (25 µin.) in thickness, particularly electrodeposits and clad metals used on electrical contacts.
1.2 This test method is designed to show whether the porosity level is less or greater than some value that, by experience, is considered by the user to be acceptable for the intended application.
1.3 A variety of other porosity testing methods are described in Guide B765 and in the literature.2,3 Other porosity test methods are Test Methods B741, B798, B799, and B809.
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 become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use. Specific precautions are given in Section 8 and
9.4.
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.
ASTM B735-16(2022) Referenced Document
ASTM B374 Standard Terminology Relating to Electroplating
ASTM B542 Standard Terminology Relating to Electrical Contacts and Their Use
ASTM B741 Standard Test Method for Porosity In Gold Coatings On Metal Substrates By Paper Electrography
ASTM B765 Standard Guide for Selection of Porosity Tests for Electrodeposits and Related Metallic Coatings
ASTM B798 Standard Test Method for Porosity in Gold or Palladium Coatings on Metal Substrates by Gel-Bulk Electrography
ASTM B799 Standard Test Method for Porosity in Gold and Palladium Coatings by Sulfurous Acid/Sulfur-Dioxide Vapor
ASTM B809 Standard Test Method for Porosity in Metallic Coatings by Humid Sulfur Vapor ("Flowers-of-Sulfur")*, 2024-04-22 Update
ASTM B735-16(2022) history
2022ASTM B735-16(2022) Standard Test Method for Porosity in Gold Coatings on Metal Substrates by Nitric Acid Vapor
2016ASTM B735-16 Standard Test Method for Porosity in Gold Coatings on Metal Substrates by Nitric Acid Vapor
2006ASTM B735-06(2011) Standard Test Method for Porosity in Gold Coatings on Metal Substrates by Nitric Acid Vapor
2006ASTM B735-06 Standard Test Method for Porosity in Gold Coatings on Metal Substrates by Nitric Acid Vapor
2005ASTM B735-05 Standard Test Method for Porosity in Gold Coatings on Metal Substrates by Nitric Acid Vapor
1995ASTM B735-95(2000) Standard Test Method for Porosity in Gold Coatings on Metal Substrates by Nitric Acid Vapor