1、Designation: D3260 01 (Reapproved 2017)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
2、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 cl
3、ear 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.
4、 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.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-izat
5、ion 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 Documents2.1 ASTM Standards:2C207 Specification for Hydrated Lime for Masonry Pur-p
6、osesD823 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 ac
7、id 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 gradehy
8、drochloric 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 Specifi
9、cationC207.5.4 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 P
10、anels of extruded aluminum alloy No. 6063-T5 withdimensions 150 by 75 by 6.3 mm (6 by 3 by14 in.) 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 (
11、5.2)for1hata 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 for1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the di
12、rect responsibility ofSubcommittee D01.55 on Factory Applied Coatings on Preformed Products.Current edition approved June 1, 2017. Published June 2017. Originallyapproved in 1982. Last previous edition approved in 2011 as D3260 01 (2011).DOI: 10.1520/D3260-01R17.2For referenced ASTM standards, visit
13、 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 sa
14、tisfactory for this purpose.Copyright ASTM International, 100 Barr Harbor Drive, 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
15、 for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1rinsing 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
16、 Immerse the panels in neutralizing solution (5.4)at246 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.7.2 Coating of Test Panels:7.2.1 Apply the c
17、oatings 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 pa
18、nels 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 t
19、o 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 whil
20、e stirring to make a soft paste thatcan be formed into a firm mortar patty approximately 40 mm(112 in.) in diameter and 6 mm (14 in.) thick.7.3.2 Apply the mortar to the top and bottom areas of thetest panels and, without drying, immediately expose them for 7days at 95 to 98 % relative humidity at a
21、 temperature of 21 62C (70 6 3.5F) in an automatically controlled cabinet.7.3.3 At the end of 7 days take the panels from the testcabinet and immediately dislodge the mortar patties from thepanels using a damp cloth to remove any residue.7.3.4 View the surface of the panels perpendicular to thesurfa
22、ce under a diffused light source providing a minimumlight intensity at the surface of 2150 1x (200 fc). Examine forblistering, peeling, lifting, crazing, flaking, or discoloration ofthe coating, and for corrosion of the coated part of thealuminum panel. Three observers shall evaluate each panel andt
23、he majority assessment shall govern.7.4 Acid Test:7.4.1 Apply a mixture of 50 parts beeswax and 50 partsparaffin to protect the raw edges to a distance of 10 mm (38 in.).7.4.2 Immerse the panels in the acid bath (5.1)at216 2C(70 6 3.5F ) for 6 h. Remove the panels, rinse in water, andallow to dry.7.
24、4.3 Examine and evaluate as in 7.3.4.8. Precision and Bias8.1 No information is presented about either the precision orbias of this test method, since the test results are nonquantitave.9. Keywords9.1 acid resistance; differentiation of coatings; extrudedaluminum parts; mortar resistance; uniform co
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