ASTM International

Standard Test Method for Porosity in Gold Coatings on Metal Substrates by Nitric Acid Vapor
 N B735

Annotation

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.

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.

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.

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 8 and 9.4.

2 For example see: Nobel, F. J., Ostrow, B. D., and Thompson, D. W., "Porosity Testing of Gold Deposits," Plating, Vol 52, 1965, p. 1001.

3 Krumbein, S. J., Porosity Testing of Contact Platings, Proceedings, Connectors and Interconnection Technology Symposium, Oct. 1987, p. 47.

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