1、Designation: F 1136M 04METRICStandard Specification forZinc/Aluminum Corrosion Protective Coatings for FastenersMetric1This standard is issued under the fixed designation F 1136M; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、 year of 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.1. Scope1.1 This specification covers the basic requirements forwater-based zinc/aluminum dispersion inorganic basecoats
3、 andoptional sealers and topcoats for fasteners. The basecoat cancontain chrome (C) or be non-chrome (NC).1.2 These coatings are applied by conventional dip-spin,dip-drain, or spray methods to ferrous parts which can behandled through a cleaning, coating, and baking operation, andwhich are not adver
4、sely affected by baking temperatures up to330C.1.3 The coating process does not induce the possibility ofinternal hydrogen embrittlement providing that the fastenershave not been cleaned or pre-treated with an acid or phosphate.Alkaline cleaning or vapor degreasing is required along withshot blastin
5、g to remove rust or scale.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 practices and determine the applica-bility of regulatory limitations pr
6、ior to use.2. Referenced Documents2.1 ASTM Standards:2B 117 Practice for Operating Salt Spray (Fog) ApparatusD 610 Test Method for Evaluating Degree of Rusting onPainted Steel SurfacesD 3359 Test Methods for Measuring Adhesion by Tape TestF 606M Test Methods for Determining the MechanicalProperties
7、of Externally and Internally Threaded Fasteners,Washers, and Rivets MetricF 1470 Guide for Fastener Sampling for Specified Mechani-cal Properties and Performance InspectionF 1789 Terminology for F16 Mechanical FastenersF 1940 Test Method for Process Control Verification toPrevent Hydrogen Embrittlem
8、ent in Plated or CoatedFasteners3. Classification3.1 These coatings are classified into six grades according tothe requirements in Table 1.3.1.1 Grade 1 requires a minimum basecoat thickness of 4m (16 g/m2). This is usually applied in two coats to bulk parts,or one coat to racked parts. No topcoat i
9、s applied in Grade 1.3.1.2 Grade 2 requires a minimum basecoat thickness of 5m (20 g/m2). This is usually applied in two coats to bulk parts,or one coat to racked parts. No topcoat is applied in Grade 2.3.1.3 Grade 3 requires a minimum basecoat thickness of 5m (20 g/m2) and a single coat of the clea
10、r sealer. The sealerprovides additional corrosion protection and greater lubricitythan Grade 2.3.1.4 Grade 4 requires a minimum basecoat thickness of 8m (28 g/m2). This is usually applied in three coats to bulkparts, or one to two coats to racked parts. No topcoat is appliedin Grade 4.3.1.5 Grade 5
11、requires a minimum basecoat thickness of 5m (20 g/m2) and a single coat of the lubricated sealer. Thesealer provides additional corrosion protection than Grade 2and greater lubricity than Grade 3.3.1.6 Grade 6 requires a minimum basecoat thickness of 5m (20 g/m2) with various pigmented topcoats appl
12、ied. Thetopcoats can be black or various other colors.4. Ordering Information4.1 Orders for parts under this specification shall include thefollowing information:4.1.1 Quantity of parts,4.1.2 Grade of coating as given in Table 1,4.1.3 Specify chrome (C) or non-chrome (NC). Unlessotherwise specified,
13、 coating to this specification will be sup-plied with chrome,1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.03 on Coatings onFasteners.Current edition approved July 1, 2004. Published July 2004.2For referenced ASTM
14、 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohoc
15、ken, PA 19428-2959, United States.4.1.4 4 For Grade 6, specify the type of topcoat (that is,Grade 6; Black, Type X), and4.1.5 Any additions to the specification as agreed uponbetween the purchaser and the supplier.5. Requirements5.1 AppearanceThe coating shall have a uniform appear-ance free from te
16、ars and other discontinuities which may affectthe appearance or performance of the coating, or both.5.2 AdhesionThe coating shall show less than 5 % re-moval following the tape adhesion test. Due to the nature of thecoating, some removal is expected, but removal of the coatingto expose the substrate
17、 indicates poor adhesion and is cause forrejection.5.3 Corrosion ResistanceThe coating shall be capable ofwithstanding exposure to salt spray test (SST) for the minimumhours (h) specified in Table 1. Unless otherwise defined,acceptable corrosion resistance shall be Rust Grade 6 or higher(see Test Me
18、thod D 610 for definition) on significant surfaces(see Terminology F 1789 for definition).5.4 BlistersThere shall be no signs of blisters after testingin accordance with 6.1.5.5 Thread FitThe coating shall not have an adverseeffect on normal installation and removal practices as deter-mined by the p
19、roper GO thread gage.5.5.1 The thickness of the coating is limited by the basicthread size (6h GO gage for external threads, 6H GO gage forinternal threads). Where greater thickness is necessary, theinternal threads may be produced oversized (before coating)providing the finished product (after coat
20、ing) meets all thespecified mechanical properties. Where mechanical propertiesare not specified, oversizing is subject to the approval of thepurchaser.5.6 Hydrogen EmbrittlementWhen specified in the pur-chase order, the applicator shall certify that the process did notexpose the parts to acid or pho
21、sphating to guarantee theabsence of internal hydrogen embrittlement.6. Test Methods6.1 CorrosionCorrosion resistance shall be tested in ac-cordance with Practice B 117 followed by Test Method D 610to rate the amount of corrosion.6.2 Coating ThicknessThe coating thickness shall bedetermined by magnet
22、ic induction, X-ray fluorescence spec-troscopy, microscopic examination of a cross-section takenperpendicular to the significant surfaces, or weigh-strip-weighmethod. When using magnetic induction, or X-ray fluores-cence, an average of ten measurements on the flat surface ofone part shall be used.NO
23、TE 1The weigh-strip-weigh method involves weighing the testspecimen before and after the coating is stripped. The method requires areagent that does not attack the base metal (for example, 20 % NaOH).6.3 AdhesionAdhesion of the coating shall be tested inaccordance with Test Methods D 3359 Scribe-Gri
24、d Test, wherepractical. Determination if base material is exposed may bedone by visually inspecting the part, or exposing the part to saltspray test (see Practice B 117) for 96 h and observing if red rustoccurs.6.4 Hydrogen EmbrittlementWhen specified in the pur-chase order, testing shall be conduct
25、ed in accordance with TestMethods F 606M or F 1940.7. Inspection7.1 When requested by the purchaser, samples shall beacquired in accordance with Guide F 1470.8. Rejection and Rehearing8.1 Materials that fail to conform to the requirements of thisspecification shall be rejected.9. Keywords9.1 aluminu
26、m; chrome; coating; corrosion; dip spin; fasten-ers; protection; resistance; rust; sealer; zincASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determina
27、tion of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard 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 with
28、drawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that you
29、r comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (sing
30、le 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).TABLE 1 Coating ClassificationGradeNo.Topcoat TypeCoatingThicknessAverage(m)CoatingWeightAverage(g/m2)MinimumSSTHours (h)(C) (NC)1 None 4 to 5 16 to 20 240 -2 None 5 to 8 20 to 28 500 2403 Clear Sealer 6 to 12 22 to 34 1000 7204 None 8 to 15 28 to 50 1000 5005 Lubricated Sealer 6 to 12 22 to 34 1000 7206 Pigmented Topcoat 8 to 15 23 to 40 500 500F1136M042
