ASTM D4584-05(2022)

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: D4584 − 05 (Reapproved 2022)
Standard Test Method for
Measuring Apparent pH of Electrocoat Baths
This standard is issued under the fixed designation D4584; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This test method covers the measurement of the free 4.1 The pH is the measure of the free hydrogen ion
hydrogen ion concentration of electrocoat baths and their concentration of a sample, and it indicates whether an electro-
ultrafiltrates. coatbathisacidic,neutral,orbasic.SincepHmeasurementsof
good precision are made in aqueous solutions, it is suggested
1.2 The values stated in SI units are to be regarded as
that the pH measurements of electrocoat baths are only
standard. No other units of measurement are included in this
semi-quantitative, and therefore such measurements should be
standard.
referred to as apparent pH measurements.
1.3 This standard does not purport to address all of the
4.2 The pH of electrocoat paints is used for research,
safety concerns, if any, associated with its use. It is the
production, and quality control or electrocoat bath process
responsibility of the user of this standard to establish appro-
control.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4.3 Other related methods for determining the pH of water
1.4 This international standard was developed in accor-
or aqueous systems are described in Test Methods D1293 and
dance with internationally recognized principles on standard-
E70.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5. Apparatus
mendations issued by the World Trade Organization Technical
5.1 pH Meter.
Barriers to Trade (TBT) Committee.
5.2 Glass and Reference Electrodes.
2. Referenced Documents
NOTE 1—Due to the polarity of electrocoat materials it is desirable to
2.1 ASTM Standards:
useaseparatesetofelectrodesforeachbathpolarity,cathodicandanodic,
D1193Specification for Reagent Water because a bath of opposite polarity poisons the electrodes. A desired
practice is to rinse the electrodes after each measurement with an
D1293Test Methods for pH of Water
appropriate solvent for the electrocoat material.
E70Test Method for pH of Aqueous Solutions With the
Glass Electrode 5.3 Thermometer, capable of 0.5°C accuracy with a −2 to
32°C range.
E180Practice for Determining the Precision of ASTM
Methods for Analysis and Testing of Industrial and Spe-
cialty Chemicals (Withdrawn 2009)
6. Reagents
6.1 Reference Standard Solutions, commercial standards of
3. Summary of Test Method
pH 4.0, 7.0, and 10.0.
3.1 Aspecimen of a well-agitated electrocoat bath is placed
6.2 Purity of Water—References to water shall be under-
in a stirrer-equipped container and the pH measured with a pH
stood to mean water conforming to Type II of Specification
meter and associated glass and reference electrodes.
D1193.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
7. Sampling and Sample Preparation
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
7.1 The sample should be obtained while the electrocoat
CurrenteditionapprovedJune1,2022.PublishedJuly2022.Originallyapproved
in 1986. Last previous edition approved in 2015 as D4584–05 (2015). DOI:
bath is under proper circulation so that a uniform material is
10.1520/D4584-05R22.
obtained. In case of an ultrafiltrate, the material should be
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
thoroughly mixed or stirred prior to sampling to assure
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on uniformity.
the ASTM website.
3 7.2 After sampling and prior to removing a test specimen it
The last approved version of this historical standard is referenced on
www.astm.org. is mandatory that the sample be shaken or stirred until it is
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