1、Designation: B533 85 (Reapproved 2013) Endorsed by AmericanElectroplaters SocietyEndorsed by NationalAssociation of Metal FinishersStandard Test Method forPeel Strength of Metal Electroplated Plastics1This standard is issued under the fixed designation B533; the number immediately following the desi
2、gnation 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 gives two pro
3、cedures for measuring theforce required to peel a metallic coating from a plasticsubstrate.2One procedure (Procedure A) utilizes a universaltesting machine and yields reproducible measurements that canbe used in research and development, in quality control andproduct acceptance, in the description o
4、f material and processcharacteristics, and in communications. The other procedure(Procedure B) utilizes an indicating force instrument that is lessaccurate and that is sensitive to operator technique. It issuitable for process control use.1.2 The tests are performed on standard molded plaques.This m
5、ethod does not cover the testing of production electro-plated parts.1.3 The tests do not necessarily measure the adhesion of ametallic coating to a plastic substrate because in properlyprepared test specimens, separation usually occurs in theplastic just beneath the coating-substrate interface rathe
6、r thanat the interface. It does, however, reflect the degree that theprocess is controlled.1.4 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 practi
7、ces and determine the applica-bility of regulatory limitations prior to use.2. Referenced Document2.1 ASTM Standards:3E4 Practices for Force Verification of Testing Machines3. Summary of Test Method3.1 A properly prepared standard test specimen, called aplaque, is copper electroplated, with no addit
8、ional metalcoating. The coated plaque is either tested as is, or it isconditioned by a low-temperature bake and then tested. Thecoating is cut through to the plastic substrate in a way thatforms two strips of coating (see Fig. 1). Each strip is peeledfrom the substrate at a right angle using an inst
9、rument thatindicates the force required to separate it from its substrate.4. Significance and Use4.1 The force required to separate a metallic coating from itsplastic substrate is determined by the interaction of severalfactors: the generic type and quality of the plastic moldingcompound, the moldin
10、g process, the process used to preparethe substrate for electroplating, and the thickness and mechani-cal properties of the metallic coating. By holding all othersconstant, the effect on the peel strength by a change in any oneof the above listed factors may be noted. Routine use of the testin a pro
11、duction operation can detect changes in any of theabove listed factors.4.2 The peel test values do not directly correlate to theadhesion of metallic coatings on the actual product.4.3 When the peel test is used to monitor the coatingprocess, a large number of plaques should be molded at onetime from
12、 a same batch of molding compound used in theproduction moldings to minimize the effects on the measure-ments of variations in the plastic and the molding process.5. Apparatus5.1 Procedure AA tension testing machine that has self-aligning grips and that has a loading range that includes theforces to
13、 be measured, 5 to 200 N, shall be used to separate thecoating from the substrate, and measure the force required. Themachine shall meet the verification requirements of PracticesE4.4,5The speed of separation of the crossarms of the machine1This test method is under the jurisdiction ofASTM Committee
14、 B08 on Metallicand Inorganic Coatingsand is the direct responsibility of Subcommittee B08.05 onDecorative Coatings.Current edition approved Dec. 1, 2013. Published December 2013. Originallyapproved in 1970. Last previous edition approved in 2009 as B533 85(2009). DOI:10.1520/B0533-85R13.2This test
15、is also known as the Jacquet Test. A detailed treatment of the test hasbeen published by Saubestre et al in Plating, Vol 52, 1965, p. 982.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume
16、information, refer to the standards Document Summary page onthe ASTM website.4The sole source of supply of the Instron universal testing machine known to thecommittee at this time is Instron Corp., Canton, MA.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 194
17、28-2959. United States1shall be adjusted to give a separation rate of 25 6 3 mm/min.The machine shall automatically and continuously record on achart the load on one coordinate and the amount of peel on theother coordinate. The amount of peel may be obtained fromcalculation, using a known chart spee
18、d.5.2 Procedure BA spring-loaded, force-indicating instru-ment with a measurement range that includes the force to bemeasured, 5 to 200 N, shall be used to measure the forcerequired to separate the coating. The indicated force shall beaccurate to 610 %.6. Sampling6.1 A sampling procedure is not appl
19、icable to this testmethod.7. Test Specimen7.1 Perform the test using a flat, molded plastic plaque suchas shown in Fig. 1. Plaque dimensions may vary up to 610 %provided that the edges of slit peel strips are not closer than 11mm from any plaque edge.8. Conditioning8.1 Condition the electroplated pl
20、aques requiring condition-ing by baking for1hinanair-circulating oven operated at70 6 3C. Place the plaques in the oven in a way that permitsfree circulation of air around all surfaces of the plaques. Allowthe conditioned plaques to cool to room temperature and thentest them within 1 h. Test the pla
21、ques that do not requireconditioning within 30 to 60 min following the coatingprocess.NOTE 1The separation strength of an unconditioned plaque willchange with time. The separation strength of a conditioned plaque maychange with time after conditioning.9. Procedure9.1 Mold the required number of plaq
22、ues using the specifiedmolding compound and molding procedure.NOTE 2When the test is used as a control of the coating process,commercially prepared plaques can be used.9.2 Clean, activate, and electroplate the plaques as speci-fied. The thickness of the metallic coating in the test area (seeFig. 1)
23、shall be 40 6 4 m.NOTE 3It is necessary to have a ductile copper coating to perform thistest. The thickness and uniformity of thickness of the metallic coatingdirectly influence the peel strength; therefore, in order to standardize thistest, the coating thickness is specified. If a different coating
24、 thickness isused, the results will not be comparable to other test results. It may benecessary to use shielding during plating to obtain the required coatingthickness uniformity.69.3 Cut through the coating along the dashed lines shown inFig. 1, and also along the centerline so as to produce twopar
25、allel strips of coating that are 25.00 6 0.25 mm wide andapproximately 75 mm long.NOTE 4Following are methods that can be used to cut the coating:(a) Slit the coating with a milling machine equipped with a slittingsaw.5,7Operate the saw at a peripheral speed of 300 mm/s and a feed of5 mm/s.5If you a
26、re aware of alternative suppliers, please provide this information toASTM International Headquarters. Your comments will receive careful consider-ation at a meeting of the responsible technical committee1, which you may attend.6Shielding methods are described in the Technical Proceedings of the Amer
27、icanElectroplaters Society, Vol 47, 1960, p. 94, and in the Monthly Review of theAmerican Electroplaters Society, Vol 34, 1947, p. 1361.7The sole source of supply of the Union HSG #14-0.064 slitting saw known tothe committee at this time is Union Twist Drill Co., Athol, MA If you are awareof alterna
28、tive suppliers, please provide this information to ASTM InternationalHeadquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee,1which you may attend.FIG. 1 PlaqueB533 85 (2013)2(b) Slit with a device such as shown in Fig. 2.(c) Cut the coating
29、with a sharp blade guided by a straightedge.5,89.4 Using a sharp chisel or knife, peel back an approxi-mately 15-mm tab of one of the strips at the end adjacent to themold gate. Fiberglas-reinforced adhesive-backed tape may beapplied to the two surfaces of the tab to improve the grip on thetab betwe
30、en the jaws of the testing machine.9.5 Procedure A:9.5.1 Install a holding fixture on the fixed arm of the testingmachine. The fixture shall support the plaque at a right angle tothe pull direction of the machine. A suitable fixture is illus-trated in Fig. 3.9.5.2 Place the plaque in the holding fix
31、ture with the tab endfacing out. Locate the plaque so that the strip to be tested iscentered over the centerline of the fixture.9.5.3 Clamp the tab in the jaws of the movable crossarm ofthe testing machine.9.5.4 Separate the strip from the plaque at a speed of 25 6 3mm/min, and continuously record t
32、he force.9.5.5 Repeat the test using the other strip on the plaque.9.5.6 If a strip tears during separation, discontinue the test.The readings obtained up to the point of tearing may be usedif at least 25 mm of the strip were separated before the tear.9.6 Procedure B:9.6.1 Restrain the plaque in a w
33、ay that permits separatingthe strip.9.6.2 Attach the tab to the spring-loaded tester.9.6.3 Separate the strip from the plaque at an angle of90 6 5 to the plaque and at a rate of 25 6 3 mm/min.9.6.4 During the separation the force on the indicator willrise to peak values and fall back. Record the pea
34、k values.9.6.5 Repeat the test using the other strip on the plaque.9.6.6 If a strip tears during separation, discontinue the test.The readings obtained up to the point of tearing may be usedif at least 25 mm of the strip were peeled before the tear.9.7 Repeat the peel test with a second plaque.9.8 E
35、xamine the underside of the peeled strip and the baredarea of the plaque and determine whether the separationoccurred in the surface layers of the plaque (cohesive failure)or at the interface (adhesive failure). Plastic adhering to theunderside of the strip is not always apparent to the naked eye,an
36、d therefore should be verified microscopically.9.9 Remove any plastic from the strip by means of a suitablesolvent. Acetone, for example, will remove ABS. Measure thethickness of the strip in several locations using a ball microm-eter that can be read to the nearest 1 m. (A micrometer thatreads in i
37、nches may be used if it can be read to the nearest0.0001 in., 0.0001 in. = 2.5 m.)8The sole source of supply of the Specimen Scriber known to the committee atthis time is Plateq Corp., New Haven, CT. If you are aware of alternative suppliers,please provide this information to ASTM International Head
38、quarters. Your com-ments will receive careful consideration at a meeting of the responsible technicalcommittee,1which you may attend.FIG. 2 Table Slitting DeviceFIG. 3 Parallelogram Device for Use with the Universal TestingMachineB533 85 (2013)310. Calculation10.1 Peel, Procedure ACalculate the arit
39、hmetic mean ofthe highest and the lowest forces that were recorded for eachstrip. Calculate the arithmetic mean of the four pull tests (twostrips on two plaques). If the testing machine indicates theforce in units other than newtons, convert the values tonewtons.10.2 Peel, Procedure BCalculate the a
40、rithmetic mean ofthe recorded peak values. If the tester indicates the force inunits other than newtons, convert the values to newtons.10.3 ThicknessCalculate the arithmetic mean thickness ofeach strip. Calculate the arithmetic mean thickness of the fourstrips (two strips on two plaques).11. Report1
41、1.1 Report the following information:11.1.1 Identification of the plastic in the plaque by generictype, manufacturer, and by manufacturers grade and lotdesignations.11.1.2 The molding conditions used.11.1.3 The cleaning, activating, and plating processes used.11.1.4 The procedure (A or B) used.11.1.
42、5 The mean peel strength of the four tests and thehighest and lowest peel values obtained. Report the values innewtons per 25-mm width. Report separately, identifying each,the results obtained with the unconditioned and the conditionedplaques.11.1.6 The arithmetic mean coating thickness and the maxi
43、-mum and minimum thicknesses. Report the values in microme-tres. Report separately, identifying each, the thicknesses for theunconditioned and the conditioned plaques.11.1.7 Whether the failure was cohesive or adhesive ormixed. Report separately, identifying each, the findings for theunconditioned a
44、nd the conditioned plaques.12. Precision and Bias12.1 The precision and bias of this test method have not yetbeen determined, but the test is useful in controlling the qualityof electroplated plastics.13. Keywords13.1 electroplated plastic; peel strength testASTM International takes no position resp
45、ecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This s
46、tandard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM Interna
47、tional Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown bel
48、ow.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).B533 85 (2013)4
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