ASTM D7639-22

Standard Test Method for Determination of Zirconium Treatment Weight or Thickness on Metal Substrates by X-Ray Fluorescence

SIGNIFICANCE AND USE
4.1 The procedure described in this test method is designed to provide a method by which the coating weight of zirconium treatments on metal substrates may be determined.  
4.2 This test method is applicable for determination of the total coating weight and the zirconium coating weight of a zirconium-containing treatment.
SCOPE
1.1 This test method covers the use of X-ray fluorescence (XRF) spectrometry for the determination of the mass of zirconium (Zr) coating weight per unit area of metal substrates.  
1.2 Coating treatments can also be expressed in units of linear thickness provided that the density of the coating is known, or provided that a calibration curve has been established for thickness determination using standards with treatment matching this of test specimens to be analyzed. For simplicity, the method will subsequently refer to the determination expressed as coating weight.  
1.3 XRF is applicable for the determination of the coating weight as zirconium or total coating weight of a zirconium containing treatment, or both, on a variety of metal substrates.  
1.4 The maximum measurable coating weight for a given coating is that weight beyond which the intensity of the characteristic X-ray radiation from the coating or the substrate is no longer sensitive to small changes in weight.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 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.  
1.7 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: 30-Nov-2022
• ICS: 25.220.40 - Metallic coatings
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.53 - Coil Coated Metal

Standards Content (Sample)

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: D7639 − 22
Standard Test Method for
Determination of Zirconium Treatment Weight or Thickness
1
on Metal Substrates by X-Ray Fluorescence
This standard is issued under the fixed designation D7639; 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 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers the use of X-ray fluorescence
E177 Practice for Use of the Terms Precision and Bias in
(XRF) spectrometry for the determination of the mass of
ASTM Test Methods
zirconium(Zr)coatingweightperunitareaofmetalsubstrates.
E691 Practice for Conducting an Interlaboratory Study to
1.2 Coating treatments can also be expressed in units of
Determine the Precision of a Test Method
linear thickness provided that the density of the coating is
known, or provided that a calibration curve has been estab-
3. Summary of Test Method
lished for thickness determination using standards with treat-
3.1 The test specimen is placed in the X-ray beam, and the
ment matching this of test specimens to be analyzed. For
resultant peak intensity of the zirconium Ka line (at 0.0786 nm
simplicity, the method will subsequently refer to the determi-
or 15.747 keV) or the zirconium La line (at 0.606 nm or
nation expressed as coating weight.
2.042 keV) is measured. The intensity (in counts or counts per
1.3 XRF is applicable for the determination of the coating second) is then compared to a previously prepared calibration
weight as zirconium or total coating weight of a zirconium curve or equation to obtain the coating weight of zirconium
2 2
treatment in mg/m or mg/ft (or µm or nm).
containing treatment, or both, on a variety of metal substrates.
3.2 The exact relationship between the measured number of
1.4 The maximum measurable coating weight for a given
counts and the corresponding coating weight (or coating
coating is that weight beyond which the intensity of the
thickness) must be established for each individual combination
characteristic X-ray radiation from the coating or the substrate
of substrate and zirconium-containing treatment. Usually de-
is no longer sensitive to small changes in weight.
termined by the treatment supplier, this relationship is estab-
1.5 The values stated in SI units are to be regarded as
lished by using primary standards having known amounts of
standard. No other units of measurement are included in this
the same treatment applied to the same substrate composition
standard.
as the test specimens to be measured.
1.6 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.1 The procedure described in this test method is designed
priate safety, health, and environmental practices and deter-
to provide a method by which the coating weight of zirconium
mine the applicability of regulatory limitations prior to use.
treatments on metal substrates may be determined.
1.7 This international standard was developed in accor-
4.2 This test method is applicable for determination of the
dance with internationally recognized principles on standard-
total coating weight and the zirconium coating weight of a
ization established in the Decision on Principles for the
zirconium-containing treatment.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5. Apparatus
Barriers to Trade (TBT) Committee.
5.1 X-RayFluorescenceSpectrometer,capableofmeasuring
the intensity of zirconium Ka or La line, and establish the
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
2
Subcommittee D01.53 on Coil Coated Metal. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2022. Published December 2022. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2010. Last previous edition approved in 2018 as D7639 – 10 (2018). Standards volume information, refer to the standard’s Document Summary page on
DOI:10.1520/D7639-22. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7639 − 22
relationship between peak
...

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: D7639 − 10 (Reapproved 2018) D7639 − 22
Standard Test Method for
Determination of Zirconium Treatment Weight or Thickness
1
on Metal Substrates by X-Ray Fluorescence
This standard is issued under the fixed designation D7639; 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 test method covers the use of X-ray fluorescence (XRF) spectrometry for the determination of the mass of zirconium (Zr)
coating weight per unit area of metal substrates.
1.2 Coating treatments can also be expressed in units of linear thickness provided that the density of the coating is known, or
provided that a calibration curve has been established for thickness determination using standards with treatment matching this of
test specimens to be analyzed. For simplicity, the method will subsequently refer to the determination expressed as coating weight.
1.3 XRF is applicable for the determination of the coating weight as zirconium or total coating weight of a zirconium containing
treatment, or both, on a variety of metal substrates.
1.4 The maximum measurable coating weight for a given coating is that weight beyond which the intensity of the characteristic
X-ray radiation from the coating or the substrate is no longer sensitive to small changes in weight.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 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.
1.7 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
2.1 ASTM Standards:
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.53 on Coil Coated Metal.
Current edition approved Sept. 1, 2018Dec. 1, 2022. Published September 2018December 2022. Originally approved in 2010. Last previous edition approved in 20142018
as D7639 – 10 (2014). DOI:10.1520/D7639-10R18.(2018). DOI:10.1520/D7639-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7639 − 22
3. Summary of Test Method
3.1 The test specimen is placed in the X-ray beam, and the resultant peak intensity of the zirconium Ka line (at 0.0786 nm or
15.747 keV) or the zirconium La line (at 0.606 nm or 2.042 keV) 2.042 keV) is measured. The intensity (in counts or counts per
second) is then compared to a previously prepared calibration curve or equation to obtain the coating weight of zirconium treatment
2 2
in mg/m or mg/ft (or μm or nm).
3.2 The exact relationship between the measured number of counts and the corresponding coating weight (or coating thickness)
must be established for each individual combination of substrate and zirconium-containing treatment. Usually determined by the
treatment supplier, this relationship is established by using primary standards having known amounts of the same treatment applied
to the same substrate composition as the test specimens to be measured.
4. Significance and Use
4.1 The procedure described in this test method is designed to provide a method by which the coating weight of zirconium
treatments on metal substrates may be determined.
4.2 This test method is applicable for determination of the total coating weight and th
...