1、Designation: F3019/F3019M 14Standard Specification forChromium Free Zinc-Flake Composite, with or withoutIntegral Lubricant, Corrosion Protective Coatings forFasteners1This standard is issued under the fixed designation F3019/F3019M; the number immediately following the designation indicates the yea
2、rof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the basic requirements fornon
3、-electrolytically applied zinc-flake composite corrosionprotective coating systems for fasteners (See Note 1).NOTE 1The coating systems do not contain hexavalent chromium,lead, cadmium, or mercury.1.2 This specification is intended for corrosion protection ofinch and metric series threaded fasteners
4、 with minimumnominal diameters of 0.250 in. for inch series and 6.00 mmfor metric as well as for non-threaded fasteners such as washersand pins.1.3 This coating system may be specified to consist of azinc-flake basecoat, or a zinc-flake basecoat and topcoat (SeeNote 2).NOTE 2For threaded fasteners,
5、the coating system will typicallyconsist of a zinc-flake basecoat and topcoat.1.3.1 The basecoat is a zinc-rich material containing alumi-num flakes dispersed in a compatible liquid medium. Thezinc-flake basecoat may be specified to contain integral lubri-cant.1.3.2 Topcoats may be organic or inorga
6、nic in compositiondepending upon the specified requirements.1.3.2.1 Organic topcoats consist of polymer resins,aluminum, dispersed pigments, and are colored in their appliedstate.1.3.2.2 Inorganic topcoats consist of water-dispersed silicatecompounds and are transparent in their applied state.1.3.2.
7、3 Topcoats contain integral lubricants and are appliedin conjunction with zinc-flake basecoats to form a coatingsystem with enhanced performance attributes such as increasedcorrosion resistance, total coefficient of friction properties,chemical resistance, and color.1.4 These zinc-flake basecoats an
8、d topcoats are applied byconventional dip-spin, dip-drain, or spray methods to fastenerswhich can be handled through a cleaning, coating, and curingoperation. The maximum curing temperature is 482F 250C.1.5 The friction properties of the coating system may bedetermined by a standard test to verify p
9、rocess control or by apart specific test which requires the purchaser to establish andcommunicate technical criteria.1.6 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsys
10、tem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.7 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 establis
11、h appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray (Fog) ApparatusB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Ex
12、amination ofCross SectionB499 Test Method for Measurement of Coating Thicknessesby the Magnetic Method: Nonmagnetic Coatings onMagnetic Basis MetalsB568 Test Method for Measurement of Coating Thicknessby X-Ray SpectrometryD610 Practice for Evaluating Degree of Rusting on PaintedSteel SurfacesD3359 T
13、est Methods for Measuring Adhesion by Tape TestE376 Practice for Measuring Coating Thickness byMagnetic-Field or Eddy-Current (Electromagnetic) Test-ing Methods1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.03 on C
14、oatings onFasteners.Current edition approved Oct. 1, 2014. Published November 2014. DOI:10.1520/F3019_F3019M14.2For 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 s
15、tandards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1F606 Test Methods for Determining the Mechanical Proper-ties of Externally and Internally Threaded Fasteners,Washers, Direct Tension Ind
16、icators, and RivetsF606M Test Methods for Determining the Mechanical Prop-erties of Externally and Internally Threaded Fasteners,Washers, and Rivets (Metric)F788 Specification for Surface Discontinuities of Bolts,Screws, and Studs, Inch and Metric SeriesF1470 Practice for Fastener Sampling for Speci
17、fied Me-chanical Properties and Performance InspectionF1624 Test Method for Measurement of Hydrogen Em-brittlement Threshold in Steel by the Incremental StepLoading TechniqueF1789 Terminology for F16 Mechanical FastenersF1940 Test Method for Process Control Verification toPrevent Hydrogen Embrittlem
18、ent in Plated or CoatedFasteners2.2 International Organization for Standardization (ISO)3ISO 16047 Fasteners Torque/clamp force testing3. Classification3.1 The coating systems are classified into four (4) gradesaccording to the requirements provided in Table 1. The processapplication parameters and
19、cure temperatures shall be inaccordance to the recommendations of the coating systemmanufacturer.3.1.1 Grade 1requires application of the zinc-flakebasecoat only. No topcoat is applied in Grade 1.Appearance ofthe coating in the applied state is silver/grey.3.1.2 Grade 2requires application of the zi
20、nc-flakebasecoat containing integral lubricant for friction modification.No topcoat is applied in Grade 2. Appearance of the coating inthe applied state is silver/grey.3.1.3 Grade 3requires application of the zinc-flakebasecoat and organic topcoat. The organic topcoat containsintegral lubricant for
21、friction modification. Options for coatingcolor and average total coefficient of friction (tot) are providedin Table 1.3.1.4 Grade 4requires application of the zinc-flakebasecoat and inorganic topcoat. The inorganic topcoat containsintegral lubricant for friction modification. Appearance of thecoati
22、ng in the applied state is silver/grey. Options for averagetotal coefficient of friction (tot) are provided in Table 1.3.2 Regardless of the process or materials used, the zinc-flake basecoat and organic/inorganic topcoats shall conform toall of the applicable requirements of this specification.4. O
23、rdering Information4.1 Orders for materials in accordance with this specifica-tion shall include the following information:4.1.1 Quantity of parts,4.1.2 Grade of coating (See Table 1),4.1.3 For Grade 3, color code of the coating,4.1.4 For Grades 3 and 4, friction code of the coating whenapplicable,4
24、.1.5 Corrosion resistance requirement expressed in testduration hours,4.1.6 Maximum coating thickness, if applicable,4.1.7 Acid free processing certification, if applicable,4.1.8 Part sampling plan,4.1.9 Certification and test report requirements, and4.1.10 Any additions to the specification as agre
25、ed upon bythe purchaser and the supplier.5. Requirements5.1 AppearanceWhen viewed without magnification, thecoating shall have a uniform appearance and be free fromuncoated areas and discontinuities which affect part functionsuch as excess coating.5.2 AdhesionThe coating shall show only trace peelin
26、g orremoval along incisions or at their intersection, acceptancecriteria 4A per Test Method D3359, following the X-Cut tapeadhesion test (See Note 3).3Available from International Organization for Standardization (ISO), 1, ch. dela Voie-Creuse, CP 56, CH-1211 Geneva 20, Switzerland, http:/www.iso.or
27、g.TABLE 1 Coating System ClassificationGrade Coating System Color Code FinishedAppearanceFriction Code Average TotalCoefficient ofFriction (tot)ABasecoat Topcoat1 Zinc-Flake None . Silver / Grey . .2Zinc-Flakew/Integral LubricantNone . Silver / Grey . 0.140.033 Zinc-Flake OrganicB Black L2 0.140.03L
28、3 0.170.03D Dark Blue . 0.170.03G Green . 0.170.03K Light Blue . 0.170.03R Red . 0.170.03S Silver L2 0.140.03L3 0.170.03Y Yellow . 0.170.034 Zinc-Flake Inorganic . Silver / GreyL1 0.110.02L2 0.140.03L3 0.170.03AThe average result of the Total Coefficient of Friction (tot) as determined in accordance
29、 to ISO 16047 shall lie within these limits when tested per 6.5.1 Program A. Frictionvalues are applicable to a minimum sample set of ten tested fasteners.F3019/F3019M 142NOTE 3Due to the nature of the coating, some removal upon testingis expected, but removal of the coating to expose the substrate
30、is anindicator of poor coating adhesion.5.3 Corrosion ResistanceCorrosion resistance is related tothe applied coating thickness of these coating systems.5.3.1 The coating system shall withstand neutral salt spraytesting for the minimum time specified in Table 2 (See Note 4).Unless otherwise defined,
31、 acceptable corrosion resistance shallbe considered to be met where there is no red corrosion of thebase metal on significant surfaces (See Terminology F1789 fordefinition).NOTE 4Bulk handling, transportation, and automatic sorting pro-cesses may lead to a reduction in the corrosion protection of th
32、e coatingsystem. Depending upon the fastener, it may be necessary to reduce thecorrosion test duration or increase the minimum applied coating thickness.5.4 BlistersThere shall be no visible presence of blistersafter testing in accordance with 6.2.5.5 Thread FitThe coating shall not have an adverse
33、effecton normal installation and removal practices, as determined bythe appropriate basic size “GO” thread gage or fit and functioninspection method. For external threaded fasteners aftercoating, the torque applied to the “GO” screw ring gauge shallnot exceed 145d3inch-pounds for inch series or 0.00
34、1d3Nmfor metric series, where d is the nominal thread diameter.5.5.1 The maximum thickness of the coating which may beapplied to threads on threaded fasteners is limited by the basicthread size: for external threaded fasteners, 3A tolerance forinch or tolerance h (6h or 4h) for metric series, and fo
35、r internalthreaded fasteners, 2B tolerance for inch or tolerance H (6H,5H, or 4H) for metric series. Prior to the application of thecoating system, external threads may be produced undersizedand internal threads may be produced oversized to accommo-date the coating thickness, provided the finished f
36、astener aftercoating meets all specified mechanical requirements.5.5.2 For external threaded fasteners which are not permit-ted to be produced undersized due to specified requirements,the maximum thickness of the coating which may be applied islimited by the basic thread size: 3A tolerance for inch
37、and 6htolerance for metric series. In these cases, the maximumcoating thickness which may be applied shall be establishedprior to coating in consultation with the applicator.5.5.3 For internal threaded fasteners which are not permit-ted to be produced oversized due to specified requirements, themaxi
38、mum thickness of the coating which may be applied islimited by the basic thread size: 2B tolerance for inch and 6Htolerance for metric series. In these cases, the maximumcoating thickness which may be applied shall be establishedprior to coating in consultation with the applicator.5.6 Hydrogen Embri
39、ttlementWhen specified in the pur-chase order, the applicator shall certify that the process doesnot expose the parts to acid (See Note 5).NOTE 5Non-electrolytically applied zinc-flake coating systems do notgenerate hydrogen during the coating process. Pre-treatment processeswhich incorporate the us
40、e of acid cleaners (that is, acid pickling) maycause hydrogen adsorption.5.7 Total Coeffcient of FrictionCoating systems contain-ing integral lubricant shall be demonstrated to meet theapplicable average total coefficient of friction requirementspecified in the purchase order.6. Test Methods6.1 Adhe
41、sionAdhesion of the coating shall be tested inaccordance with Test Method D3359 X-Cut Tape Test andvisually rated to classify the adhesion result.6.2 CorrosionCorrosion resistance shall be tested in ac-cordance with Practice B117 followed by Test Method D610 torate the percentage of corrosion.6.3 Co
42、ating ThicknessCoating thickness shall be tested inaccordance with Test Method B499, magnetic induction (SeeNote 6); Practice E376, eddy current; or Test Method B568,X-ray spectrometry. For referee purposes, microscopic exami-nation in accordance with Test Method B487 shall be used.NOTE 6Coating thi
43、ckness test results determined by magnetic induc-tion may be influenced if the parts have undergone magnetic particleinspections.6.4 Hydrogen EmbrittlementWhen specified in the pur-chase order, testing shall be conducted in accordance with TestMethods F606, F606M,orF1940. In the event that hardnessr
44、eductions occur in test specimens due to coating curing timesand temperature, testing shall be conducted alternatively inaccordance with F1624.6.5 Total Coeffcient of FrictionThe test shall be per-formed in accordance to ISO 16047 as specified in the purchaseorder (See Note 7). The results of testin
45、g shall be kept on fileand submitted to the purchaser when required.NOTE 7If unspecified in the purchase order, the default test materialsare zinc electroplated washers and zinc electroplated nuts or bolts inaccordance to ISO 16047 Sections 7.3 or 7.4.6.5.1 Test Program AWhen permissible, testing sh
46、all beperformed using M10 1.5 surrogate test bolts processed withthe production parts. With this test program, it is recommendedthat friction testing be performed at a frequency which dem-onstrates statistical control of the applicators coating process.6.5.2 Test Program BThe use of surrogate bolts
47、is notpermitted in this test program. Samples for friction testing areselected from the production lots which have been coated (SeeNote 8).NOTE 8Test hardware and fixturing specific to the part and capableinstrumentation will be required to conduct testing per Program B. Theserequired materials may
48、not be readily available at all test facilities orcoating applicators. When necessary, a facility with the capability toperform the test may be designated.TABLE 2 Neutral Salt Spray Test RequirementsTest Duration to FirstAppearance of RedCorrosionMinimum Average Coating Thickness of the AppliedCoati
49、ng SystemAHours Inch Metric240 0.157 mils 4 m480 0.197 mils 5 m600 0.236 mils 6 m720 0.315 mils 8 m960 0.394 mils 10 mAThe coating thickness is applicable to the complete coating system, basecoatand topcoat.F3019/F3019M 1437. Application7.1 A conventional pre-treatment procedure using alkalineor solvent cleaner may be used, followed by shot blasting.Micro-crystalline zinc-phosphating with coating weight in therange of26g/m2may be applied as an alternate pre-treatment.7.2 The coatings shall be non-electrolyti
