ASTM D5723-95(2015)
(Practice)Standard Practice for Determination of Chromium Treatment Weight on Metal Substrates by X-Ray Fluorescence
Standard Practice for Determination of Chromium Treatment Weight on Metal Substrates by X-Ray Fluorescence
SIGNIFICANCE AND USE
3.1 The procedure described in this practice is designed to provide a method by which the coating weight of chromium treatments on metal substrates may be determined.
3.2 This procedure is applicable for determination of the total coating weight and the chromium coating weight of a chromium-containing treatment.
SCOPE
1.1 This practice covers the use of X-ray fluorescence (XRF) techniques for determination of the coating weight of chromium treatments on metal substrates. These techniques are applicable for determination of the coating weight as chromium or total coating weight of a chromium-containing treatment, or both, on a variety of metal substrates.
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 and health practices and determine the applicability of regulatory limitations prior to use.
General Information
Relations
Buy Standard
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D5723 − 95 (Reapproved 2015)
Standard Practice for
Determination of Chromium Treatment Weight on Metal
Substrates by X-Ray Fluorescence
This standard is issued under the fixed designation D5723; 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 instrument calibration that correlates the secondary radiation
intensity with the coating weight quantitatively.
1.1 This practice covers the use of X-ray fluorescence
2.3.2 The coating weight is determined by measurement of
(XRF) techniques for determination of the coating weight of
the fluorescent X rays of the coating. The detection system is
chromium treatments on metal substrates.These techniques are
set to count the number of X rays in an energy region that is
applicable for determination of the coating weight as chro-
characteristic of X rays from the element of interest. The
mium or total coating weight of a chromium-containing
element of interest in this practice is chromium.
treatment, or both, on a variety of metal substrates.
2.3.3 If a linear relationship exists, the coating weight and
1.2 This standard does not purport to address all of the
number of counts of X rays of a chromium treatment on a
safety concerns, if any, associated with its use. It is the
particular substrate can be expressed by a conversion factor
responsibility of the user of this standard to establish appro-
that represents the number of counts for a particular coating
priate safety and health practices and determine the applica-
weight unit/unit area. This is usually expressed in mg/ft or
bility of regulatory limitations prior to use.
mg/m of chromium or total coating weight.
2. Summary of Practice
2.3.4 The exact relationship between the measured number
of counts and corresponding coating weight must be estab-
2.1 Excitation—The measurement of chromium treatment
lished for each individual combination of substrate and
coating weights by XRF methods is based on the combined
chromium-containing treatment. Usually determined by the
interaction of the chromium coating and substrate with an
treatment supplier, this relationship is established by using
intense beam of primary radiation. Since each element fluo-
primary standards having known amounts of the same treat-
resces at an energy characteristic of the particular element, this
ment applied to the same substrate composition as the speci-
interactionresultsinthegenerationofXraysofdefinedenergy.
mens to be measured.
The primary radiation may be generated by an X-ray tube or
derive from a radioisotope.
2.3.5 Some X-ray apparatus have a data handling system
whereby a coating weight versus X-ray counts curve may be
2.2 Detection—The secondary beam (fluorescent X rays of
established within the system for the direct readout of coating
the elements and scattered radiation) is read by a detector that
weight. If such apparatus does not permit the entry of a
can discriminate between the energy levels of fluorescing
conversion factor as described in 2.3.3, it is calibrated using a
radiations in the secondary beam. The detection system in-
bare, untreated specimen and a minimum of three specimens
cludes the radiation detector with electronics for pulse ampli-
with known coating weights of the treatment and substrate
fication and pulse counting.
combination of interest. The coating weight to be measured
2.3 Basic Principle:
mustbewithintherangeoftheseknowncoatingweights.More
2.3.1 A relationship exists between the treatment coating
than three known specimens must be used if the relationship of
weight and secondary radiation intensity. This relationship is
X-ray counts to coating weight is not linear over the range to
usually linear within the desired coating weights of the
be measured. The treatment supplier should be consulted for
chromium treatments on metal substrates. The measurements
recommendations for establishing the curve in the instrument
are based on primary standards of known coating weights and
for the particular treatment and substrate combination of
interest.
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
3. Significance and Use
Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.53 on Coil Coated Metal.
3.1 The procedure described in this practice is designed to
Current edition approved July 1, 2015. Published July 2015. Originally approved
provide a method by which the coating weight of chromium
in 1995. Last previous edition approved in 2010 as D5723 – 95 (2010). DOI:
10.1520/D5723-95R15. treatments on metal substrates may be determined.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D5723 − 95 (2015)
3.2 This procedure is applicable for determination of the 6. Procedure
total coating weight and the chromium coating weight of a
6.1 Operate the instrument in accordance with the manufac-
chromium-containing treatment.
turer’s instructions.
6.2 Set the instrument settings as follows:
4. Apparatus and Materials
Dial and Arm Chromium Position
4.1 Measuring Instrument, which is capable of determining
Seconds indicator per treatment supplier
Multiplier switch per treatment supplier
the coating weights of chromium-containing treatments on
Response switch per treatment supplier
metal substrates by X-ray fluorescence is required. The treat-
Range per treatment supplier
ment supplier should be consulted for the suitability of the
Milliamps adjust for calibration of output per treatment supplier
instrumentation to be used.
6.3 All specimens must be seated firmly and securely over
4.2 Calibration Standard, necessary to calibrate the instru- the measuring opening. The distance between the measuring
ment.The count value of this standard must be specifi
...
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: D5723 − 95 (Reapproved 2010) D5723 − 95 (Reapproved 2015)
Standard Practice for
Determination of Chromium Treatment Weight on Metal
Substrates by X-Ray Fluorescence
This standard is issued under the fixed designation D5723; 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 practice covers the use of X-ray fluorescence (XRF) techniques for determination of the coating weight of chromium
treatments on metal substrates. These techniques are applicable for determination of the coating weight as chromium or total
coating weight of a chromium-containing treatment, or both, on a variety of metal substrates.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Summary of Practice
2.1 Excitation—The measurement of chromium treatment coating weights by XRF methods is based on the combined
interaction of the chromium coating and substrate with an intense beam of primary radiation. Since each element fluoresces at an
energy characteristic of the particular element, this interaction results in the generation of X rays of defined energy. The primary
radiation may be generated by an X-ray tube or derive from a radioisotope.
2.2 Detection—The secondary beam (fluorescent X rays of the elements and scattered radiation) is read by a detector that can
discriminate between the energy levels of fluorescing radiations in the secondary beam. The detection system includes the radiation
detector with electronics for pulse amplification and pulse counting.
2.3 Basic Principle:
2.3.1 A relationship exists between the treatment coating weight and secondary radiation intensity. This relationship is usually
linear within the desired coating weights of the chromium treatments on metal substrates. The measurements are based on primary
standards of known coating weights and instrument calibration that correlates the secondary radiation intensity with the coating
weight quantitatively.
2.3.2 The coating weight is determined by measurement of the fluorescent X rays of the coating. The detection system is set
to count the number of X rays in an energy region that is characteristic of X rays from the element of interest. The element of
interest in this practice is chromium.
2.3.3 If a linear relationship exists, the coating weight and number of counts of X rays of a chromium treatment on a particular
substrate can be expressed by a conversion factor that represents the number of counts for a particular coating weight unit/unit area.
2 2
This is usually expressed in mg/ft or mg/m of chromium or total coating weight.
2.3.4 The exact relationship between the measured number of counts and corresponding coating weight must be established for
each individual combination of substrate and chromium-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 specimens to be measured.
2.3.5 Some X-ray apparatus have a data handling system whereby a coating weight versus X-ray counts curve may be
established within the system for the direct readout of coating weight. If such apparatus does not permit the entry of a conversion
factor as described in 2.3.3, it is calibrated using a bare, untreated specimen and a minimum of three specimens with known coating
weights of the treatment and substrate combination of interest. The coating weight to be measured must be within the range of these
known coating weights. More than three known specimens must be used if the relationship of X-ray counts to coating weight is
This practice 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 June 1, 2010July 1, 2015. Published July 2010July 2015. Originally approved in 1995. Last previous edition approved in 20022010 as D5723 - 95
(2002).D5723 – 95 (2010). DOI: 10.1520/D5723-95R10.10.1520/D5723-95R15.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D5723 − 95 (2015)
not linear over the range to be measured. The treatment supplier should be consulted for recommendations for establishing the
curve in the instrument for the particular treatment and substrate combination of interest.
3. Significance and Use
3.1 The procedure described in this practice is designed to provide a method by which the coating weight of chromium
treatments on metal substrates may be determined.
3.2 This procedure is applicable for determination of the total coating weight and the chromium coating weight of a
chromium-containing treatment.
4. Apparatus and Materials
4.1 Measuring Instrument, which is capable of determining the coating weights of chromium-containing treatments on metal
substrates by X-ray fluorescence is required. The treatment supplier should be consulted for the suitability of the instrumentation
to be used.
4.2 Calibration Standard, necessary to calibrate the instrument. The count value of this standard must be specified by the
treatment supplier.
4.3 Treated Coupon, on which the coating weight is to be determined must be cut to the required size for the instrument from
the treated substrate.
4.4 Blank (Bare and Untreated) Coupon should be a sample of the same metal substrate on which the treatment coating weight
is to be determined. It may be
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.