ASTM D4370-01
(Test Method)Standard Test Methods for Acid and Base Milliequivalent Content of Electrocoat Bath
Standard Test Methods for Acid and Base Milliequivalent Content of Electrocoat Bath
SCOPE
1.1 These test methods cover the determination of acid and base milliequivalent contents of anodic and cathodic electrocoat baths and their ultrafiltrates.
1.2 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D4370–01
Standard Test Methods for
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Acid and Base Milliequivalent Content of Electrocoat Bath
This standard is issued under the fixed designation D 4370; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope all reagents shall conform to the specifications of the Commit-
tee onAnalytical Reagents of theAmerican Chemical Society,
1.1 These test methods cover the determination of acid and
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where such specifications are available.
base milliequivalent contents of anodic and cathodic electro-
Other grades may be used, provided it is ascertained that the
coat baths and their ultrafiltrates.
reagent is of sufficiently high purity to permit its use without
1.2 This standard does not purport to address all of the
lessening the accuracy of the determination.
safety concerns, if any, associated with its use. It is the
6.2 Purity of Water—References to water shall be under-
responsibility of the user of this standard to establish appro-
stood to mean water conforming to Type II of Specification
priate safety and health practices and determine the applica-
D 1193.
bility of regulatory limitations prior to use.
6.3 Potassium Hydroxide Solution in Methanol, 0.1
2. Referenced Documents
N—Preparebydissolving5.6gofpotassiumhydroxide(KOH)
pellets in 1 L of methanol. Standardize against NIST standard
2.1 ASTM Standards:
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reference material of acid potassium phthalate No. 84 using an
D 1193 Specification For Reagent Water
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automatic potentiometric titrator to a given end point or,
3. Summary of Test Methods
alternatively, to a phenolphthalein end point.
6.4 Hydrochloric Acid Solution, 0.1 N—Prepare by mixing
3.1 Specimens are titrated with standard acid and alkali
about 8.50 mL of concentrated hydrochloric acid (HCl) (1.19
solutions respectively. Alternative procedures are given for
sp gr) into a mixture of 600 mL water and 400 mL methanol.
determining acid and base concentrations potentiometrically or
Standardize against 0.1 N potassium hydroxide solution (see
using a pH meter.
6.3).
4. Significance and Use
6.5 1,3-Propanediol (Propylene Glycol) (PG).
6.6 Tetrahydrofuran (THF).
4.1 The acid and base concentrations are a measurement of
6.7 Reference pH Standard Solutions— Commercial stan-
the titratable acidic and alkaline components in the electrocoat
dards of pH 4.0, 7.0, and 10.0.
baths.Thesemeasurementsareusedforresearch,productionor
electrocoat bath process control.
7. Sampling and Sample Preparation
5. Apparatus
7.1 The sample should be obtained while the electrocoat
bath is under proper circulation such that a uniform material is
5.1 Automatic Potentiometric Titrator with Stirrer and Re-
obtained. In case of an ultrafiltrate, the material should be
corder, any model.
thoroughly mixed or stirred prior to sampling to assure
5.2 Analytical Balance, with sensitivity of 0.1 mg.
uniformity.
5.3 pH Meter, any model.
7.2 After sampling and prior to removing a test specimen, it
5.4 Glass and Saturated Calomel Electrodes.
ismandatorythatthesamplesbeshakenorstirreduntiltheyare
5.5 Syringes, 5-mL disposable.
homogeneous and free of any settled material. This is particu-
6. Reagents
larly important if there is a delay between sampling the bath
and performing the test. The absence of settled material can be
6.1 Purity of Reagents—Reagent grade chemicals shall be
ascertained visually (in a transparent container) or by inserting
used in all tests. Unless otherwise indicated, it is intended that
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These test methods are under the jurisdiction of ASTM Committee D01 on Reagent Chemicals, American Chemical Society Specifications, American
Paint and Related Coatings, Materials, and Applications and are the direct Chemical Society, Washington, DC. For suggestions on the testing of reagents not
responsibility of Subcommittee D01.21 on Chemical Analysis of Paint and Paint listed by the American Chemical Society, see Analar Standards for Laboratory
Materials. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Current edition approved Jan. 10, 2001. Published March 2001. Originally and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
published as D 4370–84. Last previous edition D 4370–84 (1994). MD.
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Annual Book of ASTM Standards, Vol 11.01. Svehla, G., Automatic Potentiometric Titration, Pergamon Press, 1978, p. 187.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D4370
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