1. Scope

1.1 This test method covers equipment and procedures for using nitric acid vapor for determining porosity in gold coatings, greater than 0.6 m (25 in.) 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 B 765 and in the literature. ^, Other porosity test methods are Test Methods B 741, B 798, B 799, and B 809.

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

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 Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use. Specific precautions are given in Section and .

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

B374 Terminology Relating to Electroplating

B542 Terminology Relating to Electrical Contacts and Their Use

B741 Test Method for Porosity In Gold Coatings On Metal Substrates By Paper Electrography

B765 Guide for Selection of Porosity and Gross Defect Tests for Electrodeposits and Related Metallic Coatings

B798 Test Method for Porosity in Gold or Palladium Coatings on Metal Substrates by Gel-Bulk Electrography

B799 Test Method for Porosity in Gold and Palladium Coatings by Sulfurous Acid/Sulfur-Dioxide Vapor

B809 Test Method for Porosity in Metallic Coatings by Humid Sulfur Vapor (Flowers-of-Sulfur)

Keywords

gold coatings; gold platings; nitric acid vapor (porosity) test; plating porosity; pore corrosion test; porosity testing; porosity testing; nitric acid vapor: Base-metal substrates; Contact surfaces; Corrosion--electrodeposited coatings; Defects--coatings; Destructive testing--coatings; Electrical contact materials (gold alloy); Electrodeposited coatings; Electrodeposited gold coatings; Exposure tests--electrodeposited coatings; Gas exposures; Metal electrical conductors; Metallic coatings; Microscopic examination--metallic/inorganic coatings; Nitric acid; Noble metal coatings; Porosity--electrodeposited/metallic coatings; Sulfur dioxide (SO 2 ); Surface analysis--electrodeposits/electroplating;

ICS Code

ICS Number Code 25.220.40 (Metallic coatings)

DOI: 10.1520/B0735-05

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