ASTM B735-05

    Standard Test Method for Porosity in Gold Coatings on Metal Substrates by Nitric Acid Vapor

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    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)


    ICS Code

    ICS Number Code 25.220.40 (Metallic coatings)

    UNSPSC Code

    UNSPSC Code 73181100(Coating services)


    DOI: 10.1520/B0735-05

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