ASTM D6037-2013 1875 Standard Test Methods for Dry Abrasion Mar Resistance of High Gloss Coatings《高光泽度覆层耐干磨损坏的标准试验方法》.pdf

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1、Designation: D6037 13Standard Test Methods forDry Abrasion Mar Resistance of High Gloss Coatings1This standard is issued under the fixed designation D6037; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.

2、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 test method covers procedures for evaluating therelative mar resistance of high gloss coatings. Two testmethods are included. T

3、est Method A uses a device thatcontains a rotating specimen holder and two abrasive wheels.Test Method B uses a device that contains a reciprocatingspecimen holder and a single wheel that has been fitted withabrasive paper. Either method can be used to evaluate the dryabrasion mar resistance of coat

4、ings applied to planar, rigidsurfaces. Each test method provides good discrimination be-tween highly mar resistant coatings.NOTE 1The mar resistance values obtained by these test methods haveno absolute significance. They should only be used to derive relativeperformance rankings for test panels tha

5、t have been prepared from theseries of coatings that are currently being evaluated. If mar resistancevalues are quoted between laboratories, it is essential that a commonstandard be measured and that the values be compared to that standard.Even then, the values should be used with caution.1.2 The va

6、lues stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.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 s

7、afety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D523 Test Method for Specular GlossD609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint, Varnish, Conversion Coatings, andRelated Coatin

8、g ProductsD823 Practices for Producing Films of Uniform Thicknessof Paint, Varnish, and Related Products on Test PanelsD1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD3924 Specification for Environment for Conditioning andTesting Paint, Varnish, Lacquer

9、, and Related MaterialsD4060 Test Method for Abrasion Resistance of OrganicCoatings by the Taber AbraserD4449 Test Method for Visual Evaluation of Gloss Differ-ences Between Surfaces of Similar AppearanceD7091 Practice for Nondestructive Measurement of DryFilm Thickness of Nonmagnetic Coatings Appli

10、ed toFerrous Metals and Nonmagnetic, Nonconductive Coat-ings Applied to Non-Ferrous MetalsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 Definitions of Terms Sp

11、ecific to This Standard:3.1.1 mar resistance, nthe ability of a coating to resistpermanent deformation or fracture, resulting from the applica-tion of a dynamic mechanical force. These test methodsmeasure resistance to visible damage caused by mild abrasion.4. Summary of Test Method4.1 The coatings

12、that are being evaluated are applied atuniform dry film thickness to planar panels of uniform surfacetexture. After drying or curing, or both, the panels are marred.Mar resistance is assessed by measuring the coatings glosswithin the abraded and unabraded areas of test panels. Marresistance is direc

13、tly related to the coatings ability to retaingloss in abraded areas.5. Significance and Use5.1 Coatings, particularly the high gloss coatings used onautomobiles, boats, toys, etc., are subject to a wide variety ofconditions (for example, wiping, cleaning, and exposure) thatcan mar their surface. The

14、 ability of these coatings to maintaintheir appearance is an important product attribute. These testmethods provide a way to estimate the ability of high glosscoatings to resist mar damage.1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings, Materials, a

15、nd Applications and are the directresponsibility of Subcommittee D01.23 on Physical Properties of Applied PaintFilms.Current edition approved June 1, 2013. Published August 2013. Originallyapproved in 1996. Last previous edition approved in 2008 as D6037 96 (2008).DOI: 10.1520/D6037-13.2For referenc

16、ed 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.*A Summary of Changes section appears at the end of this standardCopyright

17、 ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.2 These test methods do not provide fundamental values.However they are suitable for estimating the ability of highgloss coatings to resist mar.5.3 Since the susceptibility of coatings to marri

18、ng varieswidely, the number of cycles that are needed to cause “rel-evant” mar damage also varies. Usually, 2 to 50 cycles aresufficient.TEST METHOD A6. Apparatus6.1 Application Equipment, as described in Practices D609and D823.6.2 Film Thickness Measuring Apparatus, as described inTest Methods D100

19、5 or D7091.6.3 Abrader (Fig. 1)3An abrasion tester as described inTest Method D4060 shall be used. In this method only the500-g load per wheel is used unless otherwise specified.6.4 Refacing Discan S-11 refacing disc3for resurfacingthe abrasive wheels. The load selected is the same as the testload.6

20、.5 Abrasive Wheels“Calibrase” wheels CS-10,3unlessotherwise specified or agreed. Wheels that have worn to thediameter of the wheel label should not be used. Prior to testing,ensure the expiration date has not passed.NOTE 2The abrasive quality of a Calibrase wheel may change withhardness. Hardness ca

21、n change with time and storage conditions.However, abrasive quality cant be inferred from hardness measurementsalone. Many other factors can also affect abrasive quality.6.6 Glossmeter, with 20 geometry complying with TestMethod D523 but with an opening no larger than 25 by 75 mmto accommodate 100 b

22、y 100-mm test panels. In addition,geometry that places the panel with the test surface facingupwards tends to minimize the chance of stray light affectingthe measurement when complete coverage of the opening is notattained.NOTE 3For coatings that are semi- to high-gloss, a glossmeter with a60 geomet

23、ry may be better suited.NOTE 4Subjective evaluations may be made visually by comparingabraded panels with a measured abraded standard using one of theprocedures in Test Method D4449.7. Preparation of Specimens7.1 Prepare a minimum of two 100 by 100-mm panels foreach coating that is being tested. Pre

24、pare and coat panels inaccordance with Practices D609 and D823.7.1.1 Panels,4that is, metal panels with a 6.5-mm holedrilled in the center to accommodate the mounting spindle, areavailable.7.1.2 If it is not convenient to apply test coatings to panels,4other planar, distortion-free substrates can be

25、 used by substi-tuting a “Drive Pin Type” specimen holder for the standardpanel holder.NOTE 5It is important that the panels be planar for reproducibleresults. Cutting and drilling of painted panels has not been satisfactory.NOTE 6Measurements are color dependent. Dark colors give lowervalues of glo

26、ss retention. To standardize, it is recommended that testing bedone using a black coating. Clearcoats are applied over a black basecoat.For other colors a black panel should be included as a control.3The sole source of supply of the apparatus known to the committee at this timeis Taber Industries, 4

27、55 Bryant Street, North Tonawanda, NY 14120. If you areaware of alternative suppliers, please provide this information to ASTM Interna-tional Headquarters. Your comments will receive careful consideration at a meetingof the responsible technical committee,1which you may attend.4The sole source of su

28、pply of primed Taber panels known to the committee atthis time is ACT Test Panels, LLC, 273 Industrial Drive, Hillsdale, MI. If you areaware of alternative suppliers, please provide this information to ASTM Interna-tional Headquarters. Your comments will receive careful consideration at a meetingof

29、the responsible technical committee,1which you may attend.FIG. 1 Abrader for Method AD6037 1328. Conditioning8.1 Cure the coated panels under conditions of temperatureand humidity as agreed upon between the purchaser and theseller.8.2 Unless otherwise agreed upon between the purchaserand the seller,

30、 condition the coated panels for at least 24 h at23 6 2C and 50 6 5 % relative humidity in accordance withSpecification D3924. Conduct the test in the same environmentor immediately after removal therefrom.9. Procedure9.1 Using a glossmeter that is calibrated and verified foraccuracy, measure the 20

31、 gloss at four positions within the testarea that will be abraded, approximately 38 mm from thecenter of the specimen and 90 apart. Record the mean of thesefour readings as “Unabraded Gloss.”NOTE 7It is recommended that the panel be marked, or a template becreated, to ensure that measurements are ta

32、ken in the area that will beabraded.9.2 Mount the pair of Calibrase wheels to be used on theirrespective flange holders, taking care not to handle them bytheir abrasive surfaces. Select the same load to be used in thetest and affix it to the abraser. Mount an S-11 refacing disc onthe turntable. Refa

33、ce the wheels for 25 cycles before abradingeach specimen. In each case lightly brush the residue from theresurfacing operation off each wheel. Discard the S-11 refacingdisc after each use.9.3 Mount the test panel on the turntable and subject it toabrasion for a selected number of cycles. An abrasion

34、 of 10cycles and 500 g-load are typically used, unless otherwiseagreed upon. Use a soft camels hair brush or compressed airto remove residue from the specimen after abrasion.9.4 Repeating 9.1, measure the gloss at four positions withinthe abraded area immediately following the abrasion test unlessot

35、herwise agreed upon by the interested parties. Record themean of these four readings as “Abraded Gloss.”9.4.1 If the panel was marked for measurement of un-abraded gloss, it can be easily placed in the correct position formeasuring abraded gloss. However, to compensate for anyabrasion unevenness, it

36、 is desirable to make minor adjustmentsto panel position to get the four lowest gloss readings withinthe abraded area (see Note 4).9.5 Calculate the percent gloss retention for each panel fromthe following equation:percent gloss retention 5 100 3 abraded gloss/unabraded gloss! (1)9.6 Calculate the g

37、rand mean from the means obtained foreach of the panels used to test a particular coating and report asthe percent gloss retention for that coating.10. Report10.1 Report the following information:10.1.1 The percent gloss retention values that were obtainedfor each coating in the series.10.1.2 The nu

38、mber of panels that were tested for each of thecoatings evaluated.10.1.3 The abrasive wheel, load, and number of cycles used.10.1.4 A plot of percent gloss retention versus number ofabrasion cycles, if more than one number of abrasion cycleswas used.10.1.5 Any deviation from the test procedure.11. P

39、recision and Bias511.1 PrecisionThe precision of this test method is basedon an interlaboratory study of ASTM D6037, Test Methods forDry Abrasion Mar Resistance of High Gloss Coatings MethodA, conducted in 2012. Each of eight laboratories testedthree or four different materials. Every “test result”

40、representsan individual determination, and all participants were asked toreport five test results. Unabraded and abraded gloss weremeasured and reported with both 20 and 60 geometry for allsamples. Practice E691 was followed for the design andanalysis of the data; the details are given in ASTM Resea

41、rchReport RR:D01-1170.11.1.1 Repeatability (r)The difference between repetitiveresults obtained by the same operator in a given laboratoryapplying the same test method with the same apparatus underconstant operating conditions on identical test material withinshort intervals of time would in the lon

42、g run, in the normal andcorrect operation of the test method, exceed the followingvalues only in one case in 20.11.1.1.1 Repeatability can be interpreted as maximum dif-ference between two results, obtained under repeatabilityconditions that are accepted as plausible due to random causesunder normal

43、 and correct operation of the test method.11.1.1.2 Repeatability limits are listed in Tables 1 and 2.11.1.2 Reproducibility (R)The difference between twosingle and independent results obtained by different operatorsapplying the same test method in different laboratories usingdifferent apparatus on i

44、dentical test material would, in the longrun, in the normal and correct operation of the test method,exceed the following values only in one case in 20.11.1.2.1 Reproducibility can be interpreted as maximumdifference between two results, obtained under reproducibilityconditions that are accepted as

45、plausible due to random causesunder normal and correct operation of the test method.11.1.2.2 Reproducibility limits are listed in Tables 1 and 2.11.1.3 The above terms (repeatability limit and reproduc-ibility limit) are used as specified in Practice E177.11.1.4 Any judgment in accordance with state

46、ments 11.1.1and 11.1.2 would have an approximate 95 % probability ofbeing correct.11.2 BiasAt the time of the study, there was no acceptedreference material suitable for determining the bias for this testmethod, therefore no statement on bias is being made.11.3 The precision statement was determined

47、 through sta-tistical examination of 971 results, from eight laboratories, onseven different materials described as:A: Fluorinated aromatic aerospace polyurethane topcoat onsteel substrate (black)5Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Res

48、earch Report RR:D01-1170. ContactASTM CustomerService at serviceastm.org.D6037 133B: Acrylic industrial polyurethane topcoat on steel sub-strate (black)C: Aromatic aerospace polyurethane topcoat on steel sub-strate (dark blue)D: Aromatic aerospace polyurethane topcoat on steelsubstrate (black)E: Mel

49、amine formaldehyde resin laminate panel (white)F: Melamine formaldehyde resin laminate panel (yellow)G: Urethane finish on oak hardwood flooring (clear coat)11.4 To judge the equivalency of two test results, it isrecommended to choose the material closest in characteristicsto the test material.TEST METHOD B12. Apparatus12.1 Application Equipment, see 6.1.12.2 Film Thickness Measuring Apparatus, see 6.2.TABLE 1 Mar Resistance (measured with 20 degree geometry)MaterialNumber of AbrasionCyclesAverageAxRepeatabilityStandard DeviationsrReproducibilityStan