ASTM B556-90(2018)
(Guide)Standard Guide for Measurement of Thin Chromium Coatings by Spot Test
Standard Guide for Measurement of Thin Chromium Coatings by Spot Test
SIGNIFICANCE AND USE
4.1 The thickness of a decorative chromium coating is often critical to its performance.
4.2 This procedure is useful for an approximate determination when the best possible accuracy is not required. For more reliable determinations, the following methods are available: Methods B504, B568, and B588.
4.3 This test assumes that the rate of dissolution of the chromium by the hydrochloric acid under the specified conditions is always the same.
SCOPE
1.1 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.
1.2 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.
1.3 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.
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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.
Designation: B556 − 90 (Reapproved 2018)
Standard Guide for
Measurement of Thin Chromium Coatings by Spot Test
This standard is issued under the fixed designation B556; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Microscope Technique (Withdrawn 2016)
1.1 This guide covers the use of the spot test for the
3. Summary of Guide
measurement of thicknesses of electrodeposited chromium
3.1 A drop of hydrochloric acid (test solution) is deposited
coatings over nickel and stainless steel with an accuracy of
on the surface of the test specimen, and the time required for
about 620 % (Section 9). It is applicable to thicknesses up to
2 the hydrochloric acid to penetrate through the chromium
1.2 µm.
coating (penetration time) is measured. The coating thickness
NOTE 1—Although this test can be used for coating thicknesses up to
is proportional to this time.
1.2 µm, there is evidence that the results obtained by this method are high
at thicknesses greater than 0.5 µm. In addition, for coating thicknesses
4. Significance and Use
above 0.5 µm, it is advisable to use a double drop of acid to prevent
4.1 The thickness of a decorative chromium coating is often
depletion of the test solution before completion of the test.
critical to its performance.
1.2 This standard does not purport to address all of the
4.2 This procedure is useful for an approximate determina-
safety concerns, if any, associated with its use. It is the
tion when the best possible accuracy is not required. For more
responsibility of the user of this standard to establish appro-
reliable determinations, the following methods are available:
priate safety, health, and environmental practices and deter-
Methods B504, B568, and B588.
mine the applicability of regulatory limitations prior to use.
1.3 This international standard was developed in accor-
4.3 This test assumes that the rate of dissolution of the
dance with internationally recognized principles on standard-
chromium by the hydrochloric acid under the specified condi-
ization established in the Decision on Principles for the
tions is always the same.
Development of International Standards, Guides and Recom-
5. Test Solutions
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5.1 For chromium on nickel the test solution is reagent
grade hydrochloric acid having a specific gravity at 16°C of
2. Referenced Documents
1.180 6 0.002. (This corresponds to 11.5 N 6 0.2 N, which
may be checked by titration.) For chromium on stainless steel
2.1 ASTM Standards:
the test solution is 20 g/L of antimony trioxide dissolved in
B504 Test Method for Measurement of Thickness of Metal-
reagent grade hydrochloric acid having a specific gravity at
lic Coatings by the Coulometric Method
16°C of 1.160.
B568 Test Method for Measurement of Coating Thickness
by X-Ray Spectrometry
NOTE 2—As received, reagent grade hydrochloric acid is normally
B588 Test Method for Measurement of Thickness of Trans-
more concentrated than 11.5 N.
parent or Opaque Coatings by Double-Beam Interference
6. Preparation of Test Area
6.1 The test area must be free of foreign material. Clean by
rubbing the test area with a paste of magnesium oxide, rinse it,
This guide is under the jurisdiction of ASTM Committee B08 on Metallic and
and dry it with a clean cloth or filter paper. Draw a ring with a
Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 on Test
Methods.
diameter of about 6 mm on the test area with melted paraffin or
Current edition approved Aug. 1, 2018. Published August 2018. Originally
with a wax pencil.
approved in 1971. Last previous edition approved in 2013 as B556 – 90 (2013).
DOI: 10.1520/B0556-90R18.
7. Procedure
Blum, W., and Olson, W. A., Proceedings, Am. Electroplaters Soc., Vol 28,
1940, p. 25.
7.1 Let the test specimen, the test solution, and the dropper
DuRose,A. H., and Pierce, W. J., Metal Finishing , Vol 57, March 1959, p. 54.
stand long enough to reach room temperature, which should be
For r
...
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B556 − 90 (Reapproved 2018)
Standard Guide for
Measurement of Thin Chromium Coatings by Spot Test
This standard is issued under the fixed designation B556; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Microscope Technique (Withdrawn 2016)
1.1 This guide covers the use of the spot test for the
3. Summary of Guide
measurement of thicknesses of electrodeposited chromium
3.1 A drop of hydrochloric acid (test solution) is deposited
coatings over nickel and stainless steel with an accuracy of
on the surface of the test specimen, and the time required for
about 620 % (Section 9). It is applicable to thicknesses up to
the hydrochloric acid to penetrate through the chromium
1.2 µm.
coating (penetration time) is measured. The coating thickness
NOTE 1—Although this test can be used for coating thicknesses up to
is proportional to this time.
1.2 µm, there is evidence that the results obtained by this method are high
at thicknesses greater than 0.5 µm. In addition, for coating thicknesses
4. Significance and Use
above 0.5 µm, it is advisable to use a double drop of acid to prevent
4.1 The thickness of a decorative chromium coating is often
depletion of the test solution before completion of the test.
critical to its performance.
1.2 This standard does not purport to address all of the
4.2 This procedure is useful for an approximate determina-
safety concerns, if any, associated with its use. It is the
tion when the best possible accuracy is not required. For more
responsibility of the user of this standard to establish appro-
reliable determinations, the following methods are available:
priate safety, health, and environmental practices and deter-
Methods B504, B568, and B588.
mine the applicability of regulatory limitations prior to use.
1.3 This international standard was developed in accor-
4.3 This test assumes that the rate of dissolution of the
dance with internationally recognized principles on standard-
chromium by the hydrochloric acid under the specified condi-
ization established in the Decision on Principles for the
tions is always the same.
Development of International Standards, Guides and Recom-
5. Test Solutions
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5.1 For chromium on nickel the test solution is reagent
grade hydrochloric acid having a specific gravity at 16°C of
2. Referenced Documents
1.180 6 0.002. (This corresponds to 11.5 N 6 0.2 N, which
may be checked by titration.) For chromium on stainless steel
2.1 ASTM Standards:
the test solution is 20 g/L of antimony trioxide dissolved in
B504 Test Method for Measurement of Thickness of Metal-
reagent grade hydrochloric acid having a specific gravity at
lic Coatings by the Coulometric Method
16°C of 1.160.
B568 Test Method for Measurement of Coating Thickness
by X-Ray Spectrometry
NOTE 2—As received, reagent grade hydrochloric acid is normally
B588 Test Method for Measurement of Thickness of Trans-
more concentrated than 11.5 N.
parent or Opaque Coatings by Double-Beam Interference
6. Preparation of Test Area
6.1 The test area must be free of foreign material. Clean by
rubbing the test area with a paste of magnesium oxide, rinse it,
This guide is under the jurisdiction of ASTM Committee B08 on Metallic and
and dry it with a clean cloth or filter paper. Draw a ring with a
Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 on Test
Methods. diameter of about 6 mm on the test area with melted paraffin or
Current edition approved Aug. 1, 2018. Published August 2018. Originally
with a wax pencil.
approved in 1971. Last previous edition approved in 2013 as B556 – 90 (2013).
DOI: 10.1520/B0556-90R18.
7. Procedure
Blum, W., and Olson, W. A., Proceedings, Am. Electroplaters Soc., Vol 28,
1940, p. 25. 7.1 Let the test specimen, the test solution, and the dropper
DuRose, A. H., and Pierce, W. J., Metal Finishing , Vol 57, March 1959, p. 54.
stand long enough to reach room temperature, which should be
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service a
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B556 − 90 (Reapproved 2013) B556 − 90 (Reapproved 2018)
Standard Guide for
Measurement of Thin Chromium Coatings by Spot Test
This standard is issued under the fixed designation B556; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 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 620 % (Section 9). It is applicable to thicknesses up to 1.2 μm.
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. 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.
1.2 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.3 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.
2. Referenced Documents
2.1 ASTM Standards:
B504 Test Method for Measurement of Thickness of Metallic Coatings by the Coulometric Method
B568 Test Method for Measurement of Coating Thickness by X-Ray Spectrometry
B588 Test Method for Measurement of Thickness of Transparent or Opaque Coatings by Double-Beam Interference Microscope
Technique (Withdrawn 2016)
3. Summary of Guide
3.1 A drop of hydrochloric acid (test solution) is deposited on the surface of the test specimen, and the time required for the
hydrochloric acid to penetrate through the chromium coating (penetration time) is measured. The coating thickness is proportional
to this time.
4. Significance and Use
4.1 The thickness of a decorative chromium coating is often critical to its performance.
4.2 This procedure is useful for an approximate determination when the best possible accuracy is not required. For more reliable
determinations, the following methods are available: Methods B504, B568, and B588.
4.3 This test assumes that the rate of dissolution of the chromium by the hydrochloric acid under the specified conditions is
always the same.
5. Test Solutions
5.1 For chromium on nickel the test solution is reagent grade hydrochloric acid having a specific gravity at 16°C of 1.180 6
0.002. (This corresponds to 11.5 N 6 0.2 N, which may be checked by titration.) For chromium on stainless steel the test solution
is 20 g/L of antimony trioxide dissolved in reagent grade hydrochloric acid having a specific gravity at 16°C of 1.160.
This guide is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 on Test
Methods.
Current edition approved Dec. 1, 2013Aug. 1, 2018. Published December 2013August 2018. Originally approved in 1971. Last previous edition approved in 20072013
as B556 – 90 (2007).(2013). DOI: 10.1520/B0556-90R13.10.1520/B0556-90R18.
Blum, W., and Olson, W. A., Proceedings, Am. Electroplaters Soc., Vol 28, 1940, p. 25.
DuRose, A. H., and Pierce, W. J., Metal Finishing , Vol 57, March 1959, p. 54.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
The last approved version of this historical standard is referenced on www.astm.org.
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