1、Designation:D666509(Reapproved 2014)Standard Practice forEvaluation of Aging Resistance of Pre-stressed PrepaintedMetal in a Boiling Water Test1This standard is issued under the fixed designation D6665;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、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.Scope1.1 This practice can be used to evaluate the resistance of apre-stressed prepainted metal panel t
3、o cracking and loss ofadhesion,or both,after accelerated aging by boiling water.Most coil coated products are formed and bent into specificshapes to produce a final product.These operations introducestresses,which may be relieved by cracking of the coating afteraging.1.2 This standard does not purpo
4、rt 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 health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D2794 Te
5、st Method for Resistance of Organic Coatings tothe Effects of Rapid Deformation(Impact)D4145 Test Method for Coating Flexibility of PrepaintedSheetE643 Test Method for Ball Punch Deformation of MetallicSheet Material3.Apparatus3.1 Boiling water bath big enough to hold formed testspecimens.3.2 10 mag
6、nifier(optional).3.3 Scotch#610 adhesive tape or equivalent.4.Reagents4.1 Deionized or other water,as agreed upon by customerand vendor.5.Test Specimen5.1 Bumped,bent,drawn or otherwise deformed samples,tobe agreed upon between customer and vendor.These should beprepared according to Test Methods D2
7、794,D4145,E643,and/or prepared in a manner agreed upon by customer andvendor.6.Procedure6.1 Examine the test specimens for cracking,flowering andtape pick-off(adhesion loss),and record the results.6.2 Place the formed test specimens in the boiling waterbath for one(1)min.Different times may be used
8、if agreedupon by customer and vendor.6.3 Remove the test specimens and allow them to air dryand cool to room temperature.6.4 Inspect the test specimens for cracking,flowering andadhesion loss,then repeat the tape adhesion test.7.Report7.1 Report the observations regarding cracking,floweringand adhes
9、ion loss.7.2 The degree of cracking,flowering and tape pick-offallowed should be agreed upon by customer and vendor.Report cracking,flowering and tape pick-off noted beforeboiling water aging,and cracking and tape pick-off noted afterboilingwateraging.Whenknown,reportsubstrate,pretreatment,coating s
10、ystem,production or preparation dateand any other information request agreed upon between vendorand customer.8.Keywords8.1 aging;bend;boiling water;coil;cracking;deformation;drawn metal;fabrication;flexibility;flowering;impact;pick-off;prepaint;stresses;tape-off1This practice is under the jurisdicti
11、on 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 July 1,2014 Published July 2014.Originally approvedin 2001.Last previous edition approved in 2009 as D6665 09.DOI:10.1
12、520/D6665-09R14.2For 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
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