ASTM B825-97

    Standard Test Method for Coulometric Reduction of Surface Films on Metallic Test Samples

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    1. Scope

    1.1 This test method covers procedures and equipment for determining the relative buildup of corrosion and tarnish films (including oxides) on metal surfaces by the constant-current coulometric technique, also known as the cathodic reduction method.

    1.2 This test method is designed primarily to determine the relative quantities of tarnish films on control coupons that result from gaseous environmental tests, particularly when the latter are used for testing components or systems containing electrical contacts.

    1.3 This test method may also be used to evaluate test samples that have been exposed to indoor industrial locations or other specific application environments. (See 4.6 for limitations.)

    1.4 This test method has been demonstrated to be applicable particularly to copper and silver test samples (see (1)). Other metals require further study to prove their applicability within the scope of this test method.

    1.5 The values stated in SI units are the preferred units. The values provided in parentheses are for information only.

    1.6 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 and health practices and determine the applicability of regulatory limitations prior to use.


    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

    B808 Test Method for Monitoring of Atmospheric Corrosion Chambers by Quartz Crystal Microbalances

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

    B810 Test Method for Calibration of Atmospheric Corrosion Test Chambers by Change in Mass of Copper Coupons

    B827 Practice for Conducting Mixed Flowing Gas (MFG) Environmental Tests

    D1193 Specification for Reagent Water


    ICS Code

    ICS Number Code 25.220.01 (Surface treatment and coating in general)

    UNSPSC Code

    UNSPSC Code 41114604(Corrosion testers)


    DOI: 10.1520/B0825-97

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