ASTM D6906-03
(Test Method)Standard Test Method for Determination of Titanium Treatment Weight on Metal Substrates by X-Ray Fluorescence
Standard Test Method for Determination of Titanium Treatment Weight on Metal Substrates by X-Ray Fluorescence
SIGNIFICANCE AND USE
The procedure described in this test method is designed to provide a method by which the coating weight of titanium treatments on metal substrates may be determined.
This test method is applicable for determination of the total coating weight and the titanium coating weight of a titanium-containing treatment.
SCOPE
1.1 This test method covers the use of X-ray fluorescence (XRF) techniques for determination of the coating weight of titanium treatments on metal substrates. These techniques are applicable for determination of the coating weight as titanium or total coating weight of a titanium 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.
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Designation:D6906–03
Standard Test Method for
Determination of Titanium Treatment Weight on Metal
Substrates by X-Ray Fluorescence
This standard is issued under the fixed designation D6906; 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 2.3.2 The coating weight is determined by measurement of
the fluorescent X-rays of the coating. The detection system is
1.1 This test method covers the use of X-ray fluorescence
set to count the number of X-rays in an energy region that is
(XRF) techniques for determination of the coating weight of
characteristic of X-rays from the element of interest. The
titanium treatments on metal substrates. These techniques are
element of interest in this practice is titanium.
applicable for determination of the coating weight as titanium
2.3.3 If a linear relationship exists, the coating weight and
or total coating weight of a titanium containing treatment, or
number of counts of X-rays of a chromium treatment on a
both, on a variety of metal substrates.
particular substrate can be expressed by a conversion factor
1.2 This standard does not purport to address all of the
that represents the number of counts for a particular coating
safety concerns, if any, associated with its use. It is the
weight unit/unit area. This is usually expressed in mg/ft or
responsibility of the user of this standard to establish appro-
mg/m of titanium or total coating weight.
priate safety and health practices and determine the applica-
2.3.4 The exact relationship between the measured number
bility of regulatory limitations prior to use.
of counts and the corresponding coating weight must be
2. Summary of Practice established for each individual combination of substrate and
titanium-containingtreatment.Usuallydeterminedbythetreat-
2.1 Excitation—The measurement of titanium treatment
ment supplier, this relationship is established by using primary
coating weights by XRF methods is based on the combined
standardshavingknownamountsofthesametreatmentapplied
interaction of the titanium coating and the substrate with an
to the same substrate composition as the specimens to be
intense beam of primary radiation. Since each element fluo-
measured.
resces at an energy characteristic of the particular element, this
2.3.5 Some X-ray apparatuses have a data handling system
interaction results in the generation of X-rays of defined
whereby a coating weight versus X-ray counts curve may be
energy. The primary radiation may be generated by an X-ray
established within the system for the direct readout of coating
tube or derived from a radioisotope.
weight. If such apparatus does not permit the entry of a
2.2 Detection—The secondary beam (fluorescent X-rays of
conversion factor as described in 2.3.3, it is calibrated using a
the elements and scattered radiation) is read by a detector that
bare, untreated specimen and a minimum of three specimens
can discriminate between the energy levels of fluorescing
with known coating weights of the treatment and substrate
radiations in the secondary beam. The detection system in-
combination of interest. The coating weight to be measured
cludes the radiation detector with electronics for pulse ampli-
mustbewithintherangeoftheseknowncoatingweights.More
fication and pulse counting.
than three known specimens must be used if the relationship of
2.3 Basic Principle:
X-ray counts to coating weight is not linear over the range to
2.3.1 A relationship exists between the treatment coating
be measured. The treatment supplier should be consulted for
weight and secondary radiation intensity. This relationship is
recommendations for establishing the curve in the instrument
usually linear within the desired coating weights of the
for the particular treatment and substrate combination of
titanium treatments on metal substrates. The measurements are
interest.
based on primary standards of known coating weights and
instrument calibration that correlates the secondary radiation
3. Significance and Use
intensity with the coating weight quantitatively.
3.1 The procedure described in this test method is designed
to provide a method by which the coating weight of titanium
This test method is under the jurisdiction of ASTM Committee D01 on Paint
treatments on metal substrates may be determined.
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.53 on Coil Coated Metal.
Current edition approved May 10, 2003. Published June 2003. DOI: 10.1520/
D6906-03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6906–03
3.2 This test method is applicable for determination of the 6.2 Set the instrument settings as follows:
total coating weight and the titanium coating weight of a
Dial and arm titanium position
Seconds indicator pretreatment supplier
titanium-containing treatment.
Multiplier switch pretreatment supplier
Response switch pretreatment supplier
4. Apparatus and Materials
Range pretreatment supplier
Milliamps adjust for calibration of output
4.1 MeasuringInstrument, whichiscapableofdetermining
pretreatment supplier
the coating weights of chromium-containing treatments on
6.3 All specimens must be seated firmly and securely over
metal substrates by X-ray fluorescence is required. The treat-
ment supplier should be consulted for the suitability of the the measuring opening. The distance between the measuring
apparatus and specimen must be maintained the same as that
instrumentation to be used
4.2 Calibration Standard, necessary to calibrate the instru- during the calibration. The blank and treated specimens must
be placed in the ho
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