1、Designation:D197891(Reapproved 2018)Standard Guide forAnalysis of Electrocoat Bath Samples1This standard is issued under the fixed designation D1978;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number i
2、n parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide covers the selection of test methods fordetermination of the important parameters that affect theperformance of electrocoating paints.1.
3、2 The test methods involved are D4370,D4399,D4584,and D5145.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations
4、issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D4370 Test Methods for Acid and Base MilliequivalentContent of Electrocoat BathD4399 Test Method for Measuring Electrical Conductivityof Electrocoat BathsD4584 Test Method for Me
5、asuring Apparent pH of Electro-coat BathsD5145 Test Methods for Nonvolatile and Pigment Contentof Electrocoat Baths3.Significance and Use3.1 This guide indicates test procedures recommended forthe maintenance of acceptable performance of the paint in anelectrocoating bath.Several critical parameters
6、 must be deter-mined throughout the operation of the bath.These parametersmust be adjusted when deviations from the norm occur.3.2 The test methods for electrocoat baths are unique,as theaqueous samples have a nonvolatile content between 8 and25%.Constant agitation must be present when the samples a
7、retaken and during the measurement of some of the parameters.4.Test Methods4.1 Acid and Base ContentTest Methods D4370 coversthe determination of acid and base milliequivalent content ofelectrocoat baths.4.2 Electrical ConductivityTest Method D4399 describesthe determination of the electrical conduc
8、tivity of electrocoatbaths.4.3 pH DeterminationTest Method D4584 describes themeasurement of the apparent pH of paints and ultrafiltrates ofelectrocoat baths.4.4 Nonvolatile and Pigment ContentTest Method D5145covers the determination of nonvolatile and inorganic pigmentcontent of electrocoat baths.
9、5.Precision5.1 The referenced test methods have precision limits listed.Reference to the individual standards for precision statementsis recommended.6.Keywords6.1 electrical conductivity;electrocoat baths;nonvolatilecontent;pH;pigment content1This guide is under the jurisdiction of ASTM Committee D0
10、1 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edition approved June 1,2018.Published June 2018.Originallyapproved in 1991.Last previous edition approved in 2012 as D1978 91(2
11、012).DOI:10.1520/D1978-91R18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr
12、 Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendati
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