ASTM D1978-91(2008)

Standard Guide for Analysis of Electrocoat Bath Samples

SIGNIFICANCE AND USE
This guide indicates test procedures recommended for the maintenance of acceptable performance of the paint in an electrocoating bath. Several critical parameters must be determined throughout the operation of the bath. These parameters must be adjusted when deviations from the norm occur.
The test methods for electrocoat baths are unique, as the aqueous samples have a nonvolatile content between 8 and 25 %. Constant agitation must be present when the samples are taken and during the measurement of some of the parameters.
SCOPE
1.1 This guide covers the selection of test methods for determination of the important parameters that affect the performance of electrocoating paints.
1.2 The test methods involved are D 4370, D 4399, D 4584, and D 5145.

General Information

• Status: Historical
• Publication Date: 31-Jan-2008
• ICS: 25.220.20 - Surface treatment
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.21 - Chemical Analysis of Paints and Paint Materials

Relations

• Replaces: ASTM D1978-91(2002) - Standard Guide for Analysis of Electrocoat Bath Samples
• Effective Date: 01-Feb-2008
• Replaced By: ASTM D1978-91(2014) - Standard Guide for Analysis of Electrocoat Bath Samples
• Effective Date: 01-Jul-2014

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D1978 −91(Reapproved2008)
StandardGuide for
Analysis of Electrocoat Bath Samples
This standard is issued under the fixed designation D1978; 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 electrocoating bath. Several critical parameters must be deter-
mined throughout the operation of the bath. These parameters
1.1 This guide covers the selection of test methods for
must be adjusted when deviations from the norm occur.
determination of the important parameters that affect the
performance of electrocoating paints. 3.2 The test methods for electrocoat baths are unique, as the
aqueous samples have a nonvolatile content between 8 and
1.2 The test methods involved are D4370, D4399, D4584,
25 %. Constant agitation must be present when the samples are
and D5145.
taken and during the measurement of some of the parameters.
2. Referenced Documents
4. Test Methods
2.1 ASTM Standards:
4.1 Acid and Base Content—Test Methods D4370 covers
D4370 Test Methods for Acid and Base Milliequivalent
the determination of acid and base milliequivalent content of
Content of Electrocoat Bath
electrocoat baths.
D4399 Test Method for Measuring Electrical Conductivity
4.2 Electrical Conductivity—Test Method D4399 describes
of Electrocoat Baths
the determination of the electrical conductivity of electrocoat
D4584 Test Method for Measuring Apparent pH of Electro-
baths.
coat Baths
D5145 Test Methods for Nonvolatile and Pigment Content
4.3 pH Determination—Test Method D4584 describes the
of Electrocoat Baths
measurement of the apparent pH of paints and ultrafiltrates of
electrocoat baths.
3. Significance and Use
4.4 Nonvolatile and Pigment Content—Test Method D5145
3.1 This guide indicates test procedures recommended for
covers the determination of nonvolatile and inorganic pigment
the maintenance of acceptable performance of the paint in an
content of electrocoat baths.
1 5. Precision
This guide is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coa
...