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ASTM B 556 Document Information:
Title
Standard Guide for Measurement of Thin Chromium Coatings by Spot Test
ASTM International
Publication Date:
Feb 23, 1990
Scope:
This guide covers the use of the spot test for the measurement
of thicknesses of electrodeposited chromium coatings over nickel
and stainless steel with an accuracy of about ±20 % (Section 9). It
is applicable to thicknesses up to 1.2 µm.2
NOTE 1—Although this test can be used for coating thicknesses up
to 1.2 µm, there is evidence that the results obtained by this
method are high at thicknesses greater than 0.5 µm.3 In
addition, for coating thicknesses above 0.5 µm, it is advisable to
use a double drop of acid to prevent depletion of the test solution
before completion of the test.
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 Blum, W., and Olson, W. A., Proceedings,
Am. Electroplaters Soc., Vol 28, 1940, p. 25.
3 DuRose, A. H., and Pierce, W. J., Metal
Finishing , Vol 57, March 1959, p. 54.
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