ASTM D522-1993a(2008) Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings《用锥形心轴仪测定涂覆有机涂层延伸率的标准试验方法》.pdf
《ASTM D522-1993a(2008) Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings《用锥形心轴仪测定涂覆有机涂层延伸率的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D522-1993a(2008) Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings《用锥形心轴仪测定涂覆有机涂层延伸率的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 522 93a (Reapproved 2008)Standard Test Methods forMandrel Bend Test of Attached Organic Coatings1This standard is issued under the fixed designation D 522; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 These test methods cover the determi
3、nation of theresistance to cracking (flexibility) of attached organic coatingson substrates of sheet metal or rubber-type materials.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 addre
4、ss 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:2D 823 Practices
5、 for Producing Films of Uniform Thicknessof Paint, Varnish, and Related Products on Test PanelsD 1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD 1186 Test Methods for Nondestructive Measurement ofDry Film Thickness of Nonmagnetic Coatings Applied toa Fe
6、rrous Base3D 1400 Test Method for Nondestructive Measurement ofDry Film Thickness of Nonconductive CoatingsApplied toa Nonferrous Metal Base33. Summary of Test Method3.1 The coating materials under test are applied at uniformthickness to panels of sheet metal or rubber-type materials.After drying or
7、 curing the coated panels are bent over amandrel and the resistance to cracking of the coating isdetermined. In Test Method A the coated panels are bent overa conical mandrel. In Test Method B the coated panels are bentover cylindrical mandrels of various diameters.4. Significance and Use4.1 Coating
8、s attached to substrates are elongated when thesubstrates are bent during the manufacture of articles or whenthe articles are abused in service. These test methods have beenuseful in rating attached coatings for their ability to resistcracking when elongated. They have been useful in evaluatingthe f
9、lexibility of coatings on flexible substrates.5. Test Specimen5.1 Substrates:5.1.1 If the purpose of the test is to determine the percent ofelongation of the coating material, the substrate shall becold-rolled steel strip 0.8 mm (132 in.) (22 gage) thick.5.1.2 If the purpose of the test is to rate t
10、he coated materialfor resistance to cracking, the substrate may be any type ofsheet metal or rubber-type material (for example, steel, alumi-num, tinplate, or synthetic rubber). The thickness of the sheetmetal may be less than 0.8 mm (132 in.) and the thickness of therubber-type materials may be as
11、great as 13 mm (12 in.).5.1.3 The recommended panel size is 100 mm (4 in.) inwidth and 150 mm (6 in.) in length. The maximum size that theconical mandrel can accommodate is 115 mm (412 in.) wideand 190 mm (712 in.) long.5.1.4 The surface preparation of the substrate shall beagreed upon between the p
12、urchaser and the seller. Prior to theapplication of the coating, round slightly the edges of metalpanels to remove burrs in order to eliminate anomalous edgeeffects.NOTE 1If elongations are to be determined for coatings applied tosubstrates other than 0.8 mm (132 in.) thick cold-rolled steel, they m
13、ust bemeasured with a special mandrel jig as described in Appendix X1.2.5.2 Coated Panels:5.2.1 Apply uniform coatings of the materials under test tothe substrates in accordance with Practices D 823 and air dry orbake under conditions mutually agreeable to the purchaser andthe seller. If percent elo
14、ngation is to be measured, a minimumthickness of 1.0 mil is required on 0.8 mm (132 in.) thick1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings, Materials, and Applications and are the directresponsibility of Subcommittee D01.23 on Physical Properties
15、of Applied PaintFilms.Current edition approved Feb. 15, 2008. Published February 2008. Originallyapproved in 1939. Last previous edition approved in 2001 as D 522 93a (2001).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For
16、Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Copyright by ASTM Intl (all rights reserved); Thu Mar 13 22:3
17、2:46 EST 2008Downloaded/printed byGuo Dehua (CNIS) pursuant to License Agreement. No further reproductions authorized.cold-rolled steel. Perform a minimum of three determinationsof coating thickness on each of the specimens in accordancewith Test Methods D 1005, D 1186,orD 1400.5.2.2 From precoated
18、sheets cut at least three specimens ofthe size given in 5.1.3. Use only plane (flat) sheets and roundthe edges of the panels slightly as in 5.1.4. The coating surfaceshall be free of oil and other foreign matter that might increasethe flexibility of the coating or interfere with the observationfor c
19、racking. Measure the film thickness as in 5.2.1.6. Conditioning and Number of Tests6.1 Condition the test specimens for at least 24 h at 236 2C ( 73.5 6 3.5F) and 50 6 5 % relative humidity, and testin the same environment or immediately on removal therefromunless otherwise specified by the purchase
20、r and seller.6.2 Test at least three replicate specimens in Test Method Aand at least two replicate specimens in Test Method B at eachmandrel diameter of interest.TEST METHOD ACONICAL MANDREL TEST7. Apparatus7.1 Conical Mandrel Tester , consisting of a metal cone, arotating panel-bending arm, and pa
21、nel clamps, all mounted ona metal base as illustrated in Fig. 1.7.1.1 Cone, smooth steel, 8 in. (200 mm) in length, with adiameter of 3 mm (18 in.) at one end and a diameter of 38 mm(112 in.) at the other end.8. Procedure8.1 With the operating lever of the apparatus in a horizontalposition, slip the
22、 test specimen between the mandrel and thedrawbar with the finish side towards the drawbar. Rigidlyclamp the specimen in a vertical position adjacent to themandrel by placing the long edge behind the clamping bar insuch a manner that the panel is always set up to the narrow endof the mandrel. Slip t
23、wo sheets of No. 1 brown kraft wrappingpaper, substrate 30, thoroughly lubricated on each side withtalc, between the specimen and the drawbar and hold inposition only by the pressure of the drawbar against the paper.8.2 Move the lever through about 180 at uniform velocityto bend the specimen approxi
24、mately 135. If the purpose of thetest is to measure elongation, the bend should be 15 s. Todetermine crack resistance under more simulated use condi-tions, the bend time should be about 1 s unless an alternativetime is agreed upon between the producer and the user.8.3 Examine the bent surface of the
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