1、Designation:D589410Standard Practice forCyclic Salt Fog/UV Exposure of Painted Metal,(AlternatingExposures in a Fog/Dry Cabinet and a UV/CondensationCabinet)1This standard is issued under the fixed designation D5894;the number immediately following the designation indicates the year oforiginal adopt
2、ion or,in the case of revision,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.Scope*1.1 This practice covers basic principles and operatingpractice for cyclic corrosio
3、n/UV exposure of paints on metal,using alternating periods of exposure in two different cabinets:a cycling salt fog/dry cabinet,and a fluorescent UV/condensation cabinet.1.2 This practice is limited to the methods of obtaining,measuring,and controlling exposure conditions,and proce-dures.It does not
4、 specify specimen preparation nor evaluationof results.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibi
5、lity of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D610 Practice for Evaluating Degree of Rusting on PaintedSteel SurfacesD714 Test Method for Evalua
6、ting Degree of Blistering ofPaintsD1654 Test Method for Evaluation of Painted or CoatedSpecimens Subjected to Corrosive EnvironmentsD4587 Practice for Fluorescent UV-Condensation Expo-sures of Paint and Related CoatingsG85 Practice for Modified Salt Spray(Fog)TestingG113 Terminology Relating to Natu
7、ral and Artificial Weath-ering Tests of Nonmetallic MaterialsG147 Practice for Conditioning and Handling of Nonmetal-lic Materials for Natural and Artificial Weathering TestsG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG152 Practice fo
8、r Operating Open Flame Carbon Arc LightApparatus for Exposure of Nonmetallic MaterialsG154 Practice for Operating Fluorescent LightApparatus forUV Exposure of Nonmetallic MaterialsG155 Practice for Operating Xenon Arc Light Apparatus forExposure of Non-Metallic Materials3.Terminology3.1 DefinitionsT
9、he definitions given in Terminology G113are applicable to this practice.4.Summary of Practice4.1 The test specimens are exposed to alternating periods ofone week in a fluorescent UV/condensation chamber and oneweek in a cyclic salt fog/dry chamber.The fluorescent UV/condensation cycle is 4-h UV at 0
10、.89 W/(m2 nm)at 340 nmat 60C and 4-h condensation at 50C,using UVA-340 lamps.The fog/dry chamber runs a cycle of 1-h fog at ambienttemperature and 1-h dry-off at 35C.The fog electrolyte is arelatively dilute solution,with 0.05%sodium chloride and0.35%ammonium sulfate.NOTE1The irradiance target setpo
11、int of 0.89 is based upon actualirradiance levels that have been historically widely used for coatings.5.Significance and Use5.1 The outdoor corrosion of painted metals is influenced bymany factors,including:corrosive atmospheres,rain,con-densed dew,UV light,wet/dry cycling,and temperaturecycling.Th
12、ese factors frequently have a synergistic effect onone another.This practice is intended to provide a morerealistic simulation of the interaction of these factors than isfound in traditional tests with continuous exposure to a staticset of corrosive conditions.5.2 Results obtained from this practice
13、 can be used tocompare the relative durability of materials subjected to thespecific test cycle used.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.27 on Accelerated Testing.Cu
14、rrent edition approved Dec.1,2010.Published January 2011.Originallyapproved in 1996.Last previous edition approved in 2005 as D5894 05.DOI:10.1520/D5894-10.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMSta
15、ndards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3 No single exposure test can be
16、specified as a completesimulation of actual use conditions in outdoor environments.Results obtained from exposures conducted according to thispractice can be considered as representative of actual outdoorexposures only when the degree of rank correlation has beenestablished for the specific materials being tested.The relativedurability of materials in actual outdoor service can be verydifferent in different locations because of differences in UVradiation,time of wetness,temperature,pollutants,an