ASTM_D_3260_-_01_2011.pdf

Designation:D326001(Reapproved 2011)Standard Test Method forAcid and Mortar Resistance of Factory-Applied ClearCoatings on Extruded Aluminum Products1This standard is issued under the fixed designation D3260;the number immediately following the designation indicates the year oforiginal adoption 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.Scope1.1 This test method covers the evaluation of the mortar andacid resistance of clear protective coating factory applied toextruded aluminum substrates.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 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 health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C207 Specification for Hydrated Lime for Masonry Pur-posesD823 Practices for Producing Films of Uniform Thicknessof Paint,Varnish,and Related Products on Test Panels3.Summary of Test Method3.1 Panels that have been buffed,cleaned,neutralized,andcoated with the material being evaluated are exposed to freshlyprepared mortar and to a hydrochloric acid solution.4.Significance and Use4.1 This test method will provide differentiation betweentypes of coatings for acid and motor resistance providing thecoating is applied in a uniform continuous film with a specifiedfilm thickness.5.Reagents5.1 AcidTen volume percent solution of commercial gradehydrochloric acid(31.4 to 31.8%HCl,20B)in distilledwater.5.2 Cleaning SolutionAn alkaline cleaner3in the concen-tration recommended by the manufacturer,usually 45 to 60 g/L(6 to 8 oz/gal)of water.The pH of the solution should bebetween 11.4 and 12.2.5.3 LimeBuilding lime complying with SpecificationC207.5.4 Neutralizing SolutionPrepare from a stable free-flowing,granular material having a chromate base4as recom-mended by the supplier,usually at a concentration of 90 to 120g/L(12 to 16 oz/gal)of water.5.5 SandDry sand capable of passing through a 10-meshwire screen.6.Test Panels6.1 Panels of extruded aluminum alloy No.6063-T5 withdimensions 150 by 75 by 6.3 mm(6 by 3 by14in.)shall beused for the test.7.Procedure7.1 Preparation of Test Panels:7.1.1 Buff the aluminum panels and remove the buffingcompound with an organic solvent.7.1.2 Immerse the panels in cleaning solution(5.2)for 1 h ata temperature of 93C(200F).7.1.3 Rinse the panels in tap water having a pH of 6.5 to 7.5until the surface is free of water break.Use reagent water forrinsing if the pH of the tap water is outside the specified limits.The panels shall be free from evidence of corrosion or surfaceattack.7.1.4 Immerse the panels in neutralizing solution(5.4)at 246 1C(75 6 2F)for 30 s to neutralize any retained alkalinityand to promote adhesion of the applied coatings.7.1.5 Rinse the panels in reagent water and allow them todry a minimum of 1 h before coating.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.55 on Factory Applied Coatings on Preformed Products.Current edition approved June 1,2011.Published June 2011.Originallyapproved in 1982.Last previous edition approved in 2005 as D3260 01(2005).DOI:10.1520/D3260-01R11.2For 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.3Diversey No.808 has been found satisfactory for this purpose.4Diversey No.814 has been found satisfactory for this purpose.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.2 Coating of Test Panels:7.2.1 Apply the coatings being evaluated to the test panelsin a uniform continuous film by automatic spray equipment inaccordance with Method A of Practices D823.7.2.2 For the mortar test,spray two panels on one side withtwo or more full wet coats to produce a minimum dry filmthickness of 15 m(0.6 mil)and two panels with one or morefull wet coats to produce a minimum dry film thickness of 7.5m(0.3 mi).7.2.3 For the acid test,spray two panels with two or morefull wet coats,on both sides,to produce a minimum dry filmthickness of 0.6 mil(15 m)and two panels with one or morefull wet coats on both sides to a minimum dry film thickness of7.5 m(0.3 mil).7.2.4 Allow the panels to dry for 7 days at 23 6 2C(73 63.5F)and 50 6 5%relative humidity.7.3 Mortar Test:7.3.1 Prepare freshly mixed mortar by dry mixing 75 g ofbuilding lime(5.3)and 225 g of sand(5.5)and addingsufficient reagent water while stirring to make a sof