1、Designation:D47802(Reapproved 2019)Standard Specification forZinc Yellow(Zinc Chromate)Pigments1This standard is issued under the fixed designation D478;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A numb
2、er in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers the pigments commerciallyknown a
3、s zinc yellow(zinc chromate).1.2 Two types are included:1.2.1 Type IHigh-purity,low sulfate and chloride content.1.2.2 Type IIRegular grade.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.4 This international standard was deve
4、loped 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 issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documen
5、ts2.1 ASTM Standards:2D185 Test Methods for Coarse Particles in PigmentsD387 Test Method for Color and Strength of ChromaticPigments with a Mechanical MullerD444 Test Methods for Chemical Analysis of Zinc YellowPigment(Zinc Chromate Yellow)3.Significance and Use3.1 Zinc yellow is used in rust-inhibi
6、ting protective coatingsand metal primers for ferrous and non-ferrous metals.4.Composition and Properties4.1 Dry PigmentThe pigment shall be a reaction precipi-tate of soluble chromates and a suitable zinc compound andshall be free of extenders,carbonates,and organic color in anyform.The pigment sha
7、ll conform to the requirements forcomposition prescribed in Table 1.4.2 The mass color and character of the tint and the tintingstrength formed by a mixture with a white pigment shall bewithin mutually agreed upon limits of a standard acceptable toboth the purchaser and the seller.5.Sampling5.1 Two
8、samples shall be taken at random from differentpackages from each lot,batch,days pack,or other unit ofproduction in a shipment.When no markings distinguishingbetween units of production appear,samples shall be takenfrom different packages in the ratio of two samples for each4545 kg(10 000 lb),except
9、 that for shipments of less than10 000 lb two samples shall be taken.At the option of thepurchaser,the samples may be tested separately or afterblending in equal quantities the samples from the sameproduction unit to form a composite sample.6.Test Methods6.1 Tests shall be conducted in accordance wi
10、th the follow-ing ASTM test methods:6.2 Chemical AnalysisTest Methods D444.6.3 Coarse ParticlesTest Methods D185.6.4 Mass Color and Tinting StrengthTest Method D387.7.Keywords7.1 chromatic;inhibitor metal primer;pigment;zinc chro-mate;zinc yellow1This specification is under the jurisdiction of ASTM
11、Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.31 on Pigment Specifications.Current edition approved June 1,2019.Published June 2019.Originallyapproved in 1938.Last previous edition approved in 2012 as D478 02(2012).DOI:10.15
12、20/D0478-02R19.2For 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,
13、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 Recommendations issued by
14、the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 ASTM International takes no position respecting the 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
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