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ASTM B244-09(2021)

(Test Method)

Standard Test Method for Measurement of Thickness of Anodic Coatings on Aluminum and of Other Nonconductive Coatings on Nonmagnetic Basis Metals with Eddy-Current Instruments

Standard Test Method for Measurement of Thickness of Anodic Coatings on Aluminum and of Other Nonconductive Coatings on Nonmagnetic Basis Metals with Eddy-Current Instruments

SIGNIFICANCE AND USE
5.1 The thickness of a coating is often critical to its performance. This eddy-current method is nondestructive and is suitable for measuring the thickness of anodic coatings on aluminum, as well as the thickness of most nonconductive coatings on nonmagnetic basis metals.  
5.2 This test method requires that the conductivity of the substrate be the same in the reference standard used for calibration adjustment and in the coated article to be measured.
SCOPE
1.1 This test method covers the use of eddy-current instruments for the nondestructive measurement of the thickness of a nonconductive coating on a nonmagnetic basis metal. It is intended to supplement manufacturers’ instructions for the operation of the instruments and is not intended to replace them.  
1.2 This test method is particularly useful for measuring the thickness of an anodic coating on aluminum alloys. Chemical conversion coatings are too thin to be measured by this test method.  
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.4 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.  
1.5 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.

General Information

Status
Published
Publication Date
31-Mar-2021
ICS
17.040.20 - Properties of surfaces
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.10 - Test Methods
Current Stage
Ref Project

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ASTM B244-09(2021) - Standard Test Method for Measurement of Thickness of Anodic Coatings on Aluminum and of Other Nonconductive Coatings on Nonmagnetic Basis Metals with Eddy-Current InstrumentsASTM B244-09(2021) - Standard Test Method for Measurement of Thickness of Anodic Coatings on Aluminum and of Other Nonconductive Coatings on Nonmagnetic Basis Metals with Eddy-Current Instruments
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ASTM B244-09(2021) - Standard Test Method for Measurement of Thickness of Anodic Coatings on Aluminum and of Other Nonconductive Coatings on Nonmagnetic Basis Metals with Eddy-Current Instruments
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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: B244 − 09 (Reapproved 2021) Endorsed by American
Electroplaters’ Society
Endorsed by National
Association of Metal Finishers
Standard Test Method for
Measurement of Thickness of Anodic Coatings on
Aluminum and of Other Nonconductive Coatings on
1
Nonmagnetic Basis Metals with Eddy-Current Instruments
This standard is issued under the fixed designation B244; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers the use of eddy-current instru-
B499 Test Method for Measurement of Coating Thicknesses
ments for the nondestructive measurement of the thickness of
by the Magnetic Method: Nonmagnetic Coatings on
a nonconductive coating on a nonmagnetic basis metal. It is
Magnetic Basis Metals
intended to supplement manufacturers’ instructions for the
operation of the instruments and is not intended to replace
3. Terminology
them.
3.1 Definitions of Terms Specific to This Standard:
1.2 This test method is particularly useful for measuring the
3.1.1 accuracy, n—the measure of the magnitude of error
thickness of an anodic coating on aluminum alloys. Chemical
between the result of a measurement and the true thickness of
conversion coatings are too thin to be measured by this test
the item being measured.
method.
3.1.2 adjustment, n—the physical act of aligning a instru-
1.3 The values stated in SI units are to be regarded as the
ment’s thickness readings to match those of a known thickness
standard. The values given in parentheses are for information
sample (removal of bias), in order to improve the accuracy of
only.
the instrument on a specific surface or within a specific portion
of its measurement range. An adjustment will affect the
1.4 This standard does not purport to address all of the
outcome of subsequent readings.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3.1.3 calibration, n—the high-level, controlled and docu-
priate safety, health, and environmental practices and deter- mented process of obtaining measurements on traceable cali-
mine the applicability of regulatory limitations prior to use.
bration standards over the full operating range of the
instrument, then making the necessary instrument adjustments
1.5 This international standard was developed in accor-
(as required) to correct any out-of-tolerance conditions.
dance with internationally recognized principles on standard-
3.1.3.1 Discussion—Calibration of coating thickness instru-
ization established in the Decision on Principles for the
ments is performed by the equipment manufacturer, an autho-
Development of International Standards, Guides and Recom-
rized agent, or by an authorized, trained calibration laboratory
mendations issued by the World Trade Organization Technical
in a controlled environment using a documented process. The
Barriers to Trade (TBT) Committee.
outcome of the calibration process is to restore/realign the
instrument to meet/exceed the manufacturer’s stated accuracy.
1
This test method is under the jurisdiction ofASTM Committee B08 on Metallic
and Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 on
2
Test Methods. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved April 1, 2021. Published May 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approvedin1949.Lastpreviouseditionapprovedin2014asB244 – 09(2014).DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/B0244-09R21. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B244 − 09 (2021)
3.1.4 reference standard, n—aspecimenofknownthickness manufacturer, employing suitable thickness standards and, if
used to verify the accuracy of a coating thickness measuring necessary, any deficiencies found shall be corrected.
instrument.
7.3 During use, calibration accuracy shall be verified at
3.1.5 verification of accuracy, n—obtaining measurements
frequent intervals, at least once a day.Attention shall be given
on a reference standard prior to instrument use for the purpose
to the factors
...

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1.5 Diffusion coatings are usually formed at elevated temperatures for service at elevated temperatures. This means that diffusion coatings are dynamic systems which are continually undergoing changes while in an elevated-temperature environment. It is necessary to know that certain phases are growing at the expense of others and to know the previous history of a coating to understand the significance of coating thickness data.  
1.6 Values in SI units are to be regarded as the standard. Inch-pound units are provided for information only.  
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