ASTM B244-09
(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
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.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: B244 − 09 Endorsedby 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 Department of Defense.
1. Scope* 3.1.1 accuracy, n—the measure of the magnitude of error
between the result of a measurement and the true thickness of
1.1 This test method covers the use of eddy-current instru-
the item being measured.
ments for the nondestructive measurement of the thickness of
a nonconductive coating on a nonmagnetic basis metal. It is
3.1.2 adjustment, n—the physical act of aligning a instru-
intended to supplement manufacturers’ instructions for the ment’s thickness readings to match those of a known thickness
operation of the instruments and is not intended to replace
sample (removal of bias), in order to improve the accuracy of
them. the instrument on a specific surface or within a specific portion
of its measurement range. An adjustment will affect the
1.2 This test method is particularly useful for measuring the
outcome of subsequent readings.
thickness of an anodic coating on aluminum alloys. Chemical
conversion coatings are too thin to be measured by this test
3.1.3 calibration, n—the high-level, controlled and docu-
method.
mented process of obtaining measurements on traceable cali-
bration standards over the full operating range of the
1.3 The values stated in SI units are to be regarded as the
instrument, then making the necessary instrument adjustments
standard. The values given in parentheses are for information
(as required) to correct any out-of-tolerance conditions.
only.
3.1.3.1 Discussion—Calibration of coating thickness instru-
1.4 This standard does not purport to address all of the
ments is performed by the equipment manufacturer, an autho-
safety concerns, if any, associated with its use. It is the
rized agent, or by an authorized, trained calibration laboratory
responsibility of the user of this standard to establish appro-
in a controlled environment using a documented process. The
priate safety and health practices and determine the applica-
outcome of the calibration process is to restore/realign the
bility of regulatory limitations prior to use.
instrument to meet/exceed the manufacturer’s stated accuracy.
2. Referenced Documents
3.1.4 reference standard, n—aspecimenofknownthickness
2
2.1 ASTM Standards: used to verify the accuracy of a coating thickness measuring
B499 Test Method for Measurement of Coating Thicknesses instrument.
by the Magnetic Method: Nonmagnetic Coatings on
3.1.5 verification of accuracy, n—obtaining measurements
Magnetic Basis Metals
on a reference standard prior to instrument use for the purpose
ofdeterminingtheabilityofthecoatingthicknessinstrumentto
3. Terminology
produce reliable values, compared to the combined instrument
3.1 Definitions of Terms Specific to This Standard:
manufacturer’s stated accuracy and the stated accuracy of the
reference standard.
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
Test Methods. 4. Summary of Test Method
Current edition approved April 15, 2009. Published May 2009. Originally
4.1 Instruments complying with this test method measure
approved in 1949. Last previous edition approved in 2002 as B244 – 97 (2002).
DOI: 10.1520/B0244-09.
coatingthicknessbytheuseofeddycurrents.Aprobeisplaced
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
directly on the coated surface in a perpendicular position and
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
electronic circuitry is used to convert a reference signal into a
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. coating thickness measurement.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
B244 − 09
4.2 The instrument probe coil is energized by alternating substrate. Resilient foils should be avoided if possible. Foils
current that induces eddy currents in the metal substrate. The are subject to indentation
...
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.
Endorsed by American
Designation:B244–97 (Reapproved 2002) Designation:B244–09 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 B 244; 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 Department of Defense.
1. Scope
1.1This 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. *
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
B 499 Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic
Basis Metals
3. Significance and Use
3.1The 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.
3.2Thistestmethodrequiresthattheconductivityofthesubstratebethesameinthecalibrationstandardandinthecoatedarticle
to be measured. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 accuracy, n—themeasureofthemagnitudeoferrorbetweentheresultofameasurementandthetruethicknessoftheitem
being measured.
3.1.2 adjustment, n—the physical act of aligning a instrument’s thickness readings to match those of a known thickness sample
(removal of bias), in order to improve the accuracy of the instrument on a specific surface or within a specific portion of its
measurement range. An adjustment will affect the outcome of subsequent readings.
3.1.3 calibration, n—the high-level, controlled and documented process of obtaining measurements on traceable calibration
standardsoverthefulloperatingrangeoftheinstrument,thenmakingthenecessaryinstrumentadjustments(asrequired)tocorrect
any out-of-tolerance conditions.
3.1.3.1 Discussion—Calibration of coating thickness instruments is performed by the equipment manufacturer, an authorized
agent, or by an authorized, trained calibration laboratory in a controlled environment using a documented process. The outcome
1
This test method is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 on
General Test Methods.
Current edition approved April 10, 1997.15, 2009. Published March 1998.May 2009. Originally approved in 1949. Last previous edition approved in 19932002 as
B244–79(1993). B 244 – 97 (2002).
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
B244–09
of the calibration process is to restore/realign the instrument to meet/exceed the manufacturer’s stated accuracy.
3.1.4 reference standard, n—a specimen of known thickness used to verify t
...
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.
Endorsed by American
Designation:B244–97 (Reapproved 2002) Designation:B244–09 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 B 244; 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 Department of Defense.
1. Scope
1.1This 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. *
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
B 499 Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic
Basis Metals
3. Significance and Use
3.1The 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.
3.2Thistestmethodrequiresthattheconductivityofthesubstratebethesameinthecalibrationstandardandinthecoatedarticle
to be measured. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 accuracy, n—themeasureofthemagnitudeoferrorbetweentheresultofameasurementandthetruethicknessoftheitem
being measured.
3.1.2 adjustment, n—the physical act of aligning a instrument’s thickness readings to match those of a known thickness sample
(removal of bias), in order to improve the accuracy of the instrument on a specific surface or within a specific portion of its
measurement range. An adjustment will affect the outcome of subsequent readings.
3.1.3 calibration, n—the high-level, controlled and documented process of obtaining measurements on traceable calibration
standardsoverthefulloperatingrangeoftheinstrument,thenmakingthenecessaryinstrumentadjustments(asrequired)tocorrect
any out-of-tolerance conditions.
3.1.3.1 Discussion—Calibration of coating thickness instruments is performed by the equipment manufacturer, an authorized
agent, or by an authorized, trained calibration laboratory in a controlled environment using a documented process. The outcome
1
This test method is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 on
General Test Methods.
Current edition approved April 10, 1997.15, 2009. Published March 1998.May 2009. Originally approved in 1949. Last previous edition approved in 19932002 as
B244–79(1993). B 244 – 97 (2002).
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
B244–09
of the calibration process is to restore/realign the instrument to meet/exceed the manufacturer’s stated accuracy.
3.1.4 reference standard, n—a specimen of known thickness used to verify t
...
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