1、Designation: D1978 91 (Reapproved 2014)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 n
2、umber in 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 electrocoatin
3、g paints.1.2 The test methods involved are D4370, D4399, D4584,and D5145.2. 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 Measurin
4、g 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 mus
5、t 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
6、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 condu
7、ctivity 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
8、.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 contentASTM International takes no position respecting the
9、 validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is
10、 subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Hea
11、dquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This st
12、andard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or
13、serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ guide is under the jurisdiction of ASTM Committee D01 on Paint a
14、ndRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edition approved July 1, 2014. Published July 2014. Originally approvedin 1991. Last previous edition approved in 2008 as D1978 91 (2008).
15、 DOI:10.1520/D1978-91R14.2For 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 Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1
