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ASTM B651-83(2024)

Current Reaffirmation

Standard Test Method for Measurement of Corrosion Sites in Nickel Plus Chromium or Copper Plus Nickel Plus Chromium Electroplated Surfaces with Double-Beam Interference Microscope

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1.1 This test method provides a means for measuring the average dimensions and number of corrosion sites in an electroplated decorative nickel plus chromium or copper plus nickel plus chromium coating on steel after the coating has been subjected to corrosion tests. This test method is useful for comparing the relative corrosion resistances of different electroplating systems and for comparing the relative corrosivities of different corrosive environments. The numbers and sizes of corrosion sites are related to deterioration of appearance. Penetration of the electroplated coatings leads to appearance of basis metal corrosion products.

1.2 The values stated in SI units are to be regarded as the standard.

1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 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.


4.1 Different electroplating systems can be corroded under the same conditions for the same length of time. Differences in the average values of the radius or half-width or of penetration into an underlying metal layer are significant measures of the relative corrosion resistance of the systems. Thus, if the pit radii are substantially higher on samples with a given electroplating system, when compared to other systems, a tendency for earlier failure of the former by formation of visible pits is indicated. If penetration into the semi-bright nickel layer is substantially higher, a tendency for earlier failure by corrosion of basis metal is evident.

SDO ASTM: ASTM International
Document Number B651
Publication Date May 1, 2024
Language en - English
Page Count 3
Revision Level 83(2024)
Supercedes
Committee B08.05
Publish Date Document Id Type View
Aug. 26, 1983 B0651-83R95 Revision
May 1, 2024 B0651-83R24 Reaffirmation
Oct. 1, 2019 B0651-83R19 Reaffirmation
March 1, 2015 B0651-83R15 Reaffirmation
Nov. 1, 2010 B0651-83R10 Reaffirmation
April 1, 2006 B0651-83R06 Reaffirmation
Aug. 26, 1983 B0651-83R01 Reaffirmation