ASTM D7893-2013 8284 Standard Guide for Corrosion Test Panel Preparation Testing and Rating of Coil-Coated Building Products《线圈涂层建筑产品腐蚀试验板制备 试验和评级的标准指南》.pdf
《ASTM D7893-2013 8284 Standard Guide for Corrosion Test Panel Preparation Testing and Rating of Coil-Coated Building Products《线圈涂层建筑产品腐蚀试验板制备 试验和评级的标准指南》.pdf》由会员分享,可在线阅读,更多相关《ASTM D7893-2013 8284 Standard Guide for Corrosion Test Panel Preparation Testing and Rating of Coil-Coated Building Products《线圈涂层建筑产品腐蚀试验板制备 试验和评级的标准指南》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D7893 13Standard Guide forCorrosion Test Panel Preparation, Testing, and Rating ofCoil-Coated Building Products1This standard is issued under the fixed designation D7893; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、 the year of last revision. A number 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 has been written specifically for coil-coatedmetal building products.1.2 This guide applies to
3、 preparation, testing, and rating ofline-coated and laboratory-coated test panels for the purpose ofcomparing and ranking the panels for corrosion resistance andother related properties.1.3 Testing may include accelerated laboratory corrosiontests and outdoor exposure tests.1.4 The values stated in
4、SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and healt
5、h practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray (Fog) ApparatusD610 Practice for Evaluating Degree of Rusting on PaintedSteel SurfacesD714 Test Method for Evaluating Degree of Bliste
6、ring ofPaintsD870 Practice for Testing Water Resistance of CoatingsUsing Water ImmersionD1654 Test Method for Evaluation of Painted or CoatedSpecimens Subjected to Corrosive EnvironmentsD1735 Practice for Testing Water Resistance of CoatingsUsing Water Fog ApparatusD2247 Practice for Testing Water R
7、esistance of Coatings in100 % Relative HumidityD2803 Guide for Testing Filiform Corrosion Resistance ofOrganic Coatings on MetalD3359 Test Methods for Measuring Adhesion by Tape TestD4138 Practices for Measurement of Dry Film Thickness ofProtective Coating Systems by Destructive, Cross-Sectioning Me
8、ansD4585 Practice for Testing Water Resistance of CoatingsUsing Controlled CondensationD5796 Test Method for Measurement of Dry Film Thicknessof Thin-Film Coil-Coated Systems by Destructive MeansUsing a Boring DeviceD5894 Practice for Cyclic Salt Fog/UV Exposure of PaintedMetal, (Alternating Exposur
9、es in a Fog/Dry Cabinet and aUV/Condensation Cabinet)D7091 Practice for Nondestructive Measurement of DryFilm Thickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic, Nonconductive Coat-ings Applied to Non-Ferrous MetalsG7 Practice for Atmospheric Environmental Exposure Test-ing o
10、f Nonmetallic MaterialsG85 Practice for Modified Salt Spray (Fog) TestingG87 Practice for Conducting Moist SO2TestsG169 Guide for Application of Basic Statistical Methods toWeathering Tests2.2 SAE Standards:3J2334 Laboratory Cyclic Corrosion Test3. Terminology3.1 Definitions:3.1.1 test panel, na rep
11、resentative specimen of metalsubstrate, coated with a coating system for evaluation, andprepared in a way that allows measurement of environmentaldegradation, especially corrosion, for system performancecomparisons and ranking.4. Summary of Guide4.1 Test panels may be collected from coil line clips
12、andformed building panels, or may be laboratory-prepared.1This guide is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.53 on Coil Coated Metal.Current edition approved Nov. 1, 2013. Published
13、November 2013. DOI:10.1520/D7893-13.2For 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.3Available from SAE Inter
14、national (SAE), 400 Commonwealth Dr., Warrendale,PA 15096-0001, http:/www.sae.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.2 Test panels are prepared for testing in a specific con-figuration that simulates conditions on build
15、ings.4.3 Test panels are exposed to specific conditions in accor-dance with standard practices and methods.4.4 After testing, corrosion is measured in a way that relatesto building performance and allows performance rankingamong samples, for example, by the corrosion creep distancefrom test panel ed
16、ges.5. Significance and Use5.1 Coil-coated metals are subjected to a wide range ofenvironmental stresses. Corrosion at cut edges, damage points,and fabricated areas can occur and lead to premature failure.Proper preparation and rating of test panels produces meaning-ful test results that allows comp
17、arisons between metal sub-strates and their pretreatments as well as between coatingsystems.5.2 Laboratory-prepared test panels give a relative compari-son of the substrates and coating systems under test, but maynot duplicate all of the stresses imposed on manufacturedcomponents. Validation of resu
18、lts on a manufactured product isrecommended.5.3 Laboratory accelerated corrosion testing is useful inevaluating relative performance of new and existing metalcoatings, pretreatments, and paints. It is up to the participatingparties to agree on the significance of these tests to actual use.6. Test Pa
19、nel Preparation6.1 An experiment is planned to evaluate the effects ofspecific variables in the coated metal system on corrosionperformance. These variables typically include metal substrate,cleaning, pretreatment, primer, topcoat, forming, and otherappropriate stresses.6.2 The number of replicates
20、in a test is determined byavailability of substrate, time, resource constraints, and statis-tical methods for data analysis. Statistical methods require anumber of replicates which is dependent upon the variability ofthe system under test and the measurement system itself.Although not specific to co
21、rrosion testing, Guide G169 canserve as a reference for using statistical methods. Because oftest variations, a thorough experimental plan includes controlsto rank results. Positive (known good performance) and nega-tive (known poor performance) controls may be included formore effective data interp
22、retation.6.3 The test panel size, configuration, and features (shape,bends, scribe lines, etc.) are factors in any corrosion test andshould be determined during planning in order to ensureenough coated metal is available. A typical flat exposure testpanel might be 10 by 20 cm, but could vary to acco
23、mmodateother configurations. The anticipated corrosion creep distancewould also influence test panel size.6.4 The test panel configuration and features are chosen tosimulate real building panels. These might include cut edges,lap edges, scribe lines (to simulate damage), holes with orwithout fastene
24、rs, tension bends, impact dimples, and otherforming operations (see Fig. A1.1).6.5 In addition to test panel configuration, the laboratoryaccelerated corrosion tests, exposure sites, and panel orienta-tions should be considered. Exposure sites represent uniqueenvironments that cyclically expose the
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