1、Designation: F1136/F1136M 11Standard Specification forZinc/Aluminum Corrosion Protective Coatings forFasteners1This standard is issued under the fixed designation F1136/F1136M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the ye
2、ar 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. Scope*1.1 This specification covers the basic requirements forwater-based zinc/aluminum dispersion inorganic basecoats an
3、doptional 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 adversel
4、y affected by baking temperatures up to330C 626F.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 blast
5、ing to remove rust or scale.1.4 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, eachsystem shall be used independently of the other. Combiningvalues from the two systems may re
6、sult in non-conformancewith the standard.1.5 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
7、 limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray (Fog) ApparatusD610 Practice for Evaluating Degree of Rusting on PaintedSteel SurfacesD3359 Test Methods for Measuring Adhesion by Tape TestF606 Test Methods for Determining the Mechanical Pro
8、p-erties of Externally and Internally Threaded Fasteners,Washers, Direct Tension Indicators, and RivetsF606M Test Methods for Determining the MechanicalProperties of Externally and Internally Threaded Fasteners,Washers, and Rivets (Metric)F1624 Test Method for Measurement of Hydrogen Em-brittlement
9、Threshold in Steel by the Incremental StepLoading TechniqueF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1624 Test Method for Measurement of Hydrogen Em-brittlement Threshold in Steel by the Incremental StepLoading TechniqueF1789 Terminology for
10、 F16 Mechanical FastenersF1940 Test Method for Process Control Verification toPrevent Hydrogen Embrittlement 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 of4m
11、 16g/m2 or 0.16 mil (0.052 oz/ft2). This is usuallyapplied in two coats to bulk parts, or one coat to racked parts.No topcoat is applied in Grade 1.3.1.2 Grade 2 requires a minimum basecoat thickness of5m 20 g/m2 or 0.20 mil (0.066 oz/ft2). This is usuallyapplied in two coats to bulk parts, or one c
12、oat to racked parts.No topcoat is applied in Grade 2.3.1.3 Grade 3 requires a minimum basecoat thickness of5m 20 g/m2 or 0.20 mil (0.066 oz/ft2) and a single coat ofthe clear sealer. The sealer provides additional corrosionprotection and greater lubricity than Grade 2.3.1.4 Grade 4 requires a minimu
13、m basecoat thickness of8m 28 g/m2 or 0.31 mil (0.092 oz/ft2). This is usuallyapplied in three coats to bulk parts, or one to two coats toracked parts. No topcoat is applied in Grade 4.3.1.5 Grade 5 requires a minimum basecoat thickness of5m 20 g/m2 or 0.20 mil (0.066 oz/ft2) and a single coat ofthe
14、lubricated sealer. The sealer provides additional corrosionprotection than Grade 2 and greater lubricity than Grade 3.1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.03 on Coatings onFasteners.Current edition approv
15、ed Nov. 1, 2011. Published December 2011. Originallyapproved in 1988. Last previous edition approved in 2010 as F113610. DOI:10.1520/F1136_F1136M-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStanda
16、rds volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.6 Grade 6 requires a minimu
17、m basecoat thickness of5m 20 g/m2 or 0.20 mil (0.066 oz/ft2) with variouspigmented topcoats applied. The topcoats can be black orvarious 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 coa
18、ting as given in Table 1,4.1.3 Specify chrome (C) or non-chrome (NC). Unlessotherwise specified, coating to this specification will be sup-plied with chrome,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 uponbe
19、tween the purchaser and the supplier.5. Requirements5.1 AppearanceThe coating shall have a uniform appear-ance free from tears 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
20、adhesion test. Due to the nature of thecoating, some removal is expected, but removal of the coatingto expose the substrate 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)
21、 specified in Table 1. Unless otherwise defined,acceptable corrosion resistance shall be Rust Grade 6 or higher(see Test Method D610 for definition) on significant surfaces(see Terminology F1789 for definition).5.4 BlistersThere shall be no signs of blisters after testingin accordance with 6.1.5.5 T
22、hread FitThe coating shall not have an adverseeffect on normal installation and removal practices as deter-mined by the proper GO thread gage.5.5.1 The thickness of the coating is limited by the basicthread size (3A GO gage for external threads, 2B GO gage forinternal threads). Where greater thickne
23、ss is necessary, theinternal threads may be produced oversized (before coating)providing the finished product (after coating) meets all thespecified mechanical properties. Where mechanical propertiesare not specified, oversizing is subject to the approval of thepurchaser.5.6 Hydrogen EmbrittlementWh
24、en specified in the pur-chase order, the applicator shall certify that the process did notexpose the parts to acid or phosphating to guarantee theabsence of internal hydrogen embrittlement.6. Test Methods6.1 CorrosionCorrosion resistance shall be tested in ac-cordance with Practice B117 followed by
25、Test Method D610 torate the amount of corrosion.6.2 Coating ThicknessThe coating thickness shall bedetermined by magnetic induction, X-ray fluorescence spec-troscopy, microscopic examination of a cross-section takenperpendicular to the significant surfaces, or weigh-strip-weighmethod. When using mag
26、netic induction, or X-ray fluores-cence, an average of ten measurements on the flat surface ofone part shall be used.NOTE 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 e
27、xample, 20 % NaOH).6.3 AdhesionAdhesion of the coating shall be tested inaccordance with Test Methods D3359 Scribe-Grid Test, wherepractical. Determination if base material is exposed may bedone by visually inspecting the part, or exposing the part to saltspray test (see Practice B117) for 96 h and
28、observing if red rustoccurs.6.4 Hydrogen EmbrittlementWhen specified in the pur-chase order, testing shall be conducted in accordance with TestMethods F606, F606M or F1940. In the event that hardnessreductions occur in test specimens due to coating curing timesand temperatures, testing shall be cond
29、ucted alternatively inaccordance with Test Method F1624.7. Inspection7.1 When requested by the purchaser, samples shall beacquired in accordance with Guide F1470.8. Rejection and Rehearing8.1 Materials that fail to conform to the requirements of thisspecification shall be rejected.9. Keywords9.1 alu
30、minum; chrome; coating; corrosion; dip spin; fasten-ers; protection; resistance; rust; sealer; zincTABLE 1 Coating ClassificationGradeNo.Topcoat TypeCoating Thickness Coating WeightMinimumSSTHours (h)MetricAverage(mil)InchAverage(mil)MetricAverage(g/m2)InchAverage(oz/ft2)(C) (NC)1 None 4 to 5 0.16 t
31、o 0.20 16 to 20 0.052 to 0.066 240 -2 None 5 to 8 0.20 to 0.31 20 to 28 0.066 to 0.092 500 2403 Clear Sealer 6 to 12 0.24 to 0.47 22 to 34 0.072 to 0.111 1000 7204 None 8 to 15 0.31 to 0.59 28 to 50 0.092 to 0.164 1000 5005 Lubricated Sealer 6 to 12 0.24 to 0.47 22 to 34 0.072 to 0.111 1000 7206 Pig
32、mented Topcoat 8 to 15 0.31 to 0.59 23 to 40 0.075 to 0.131 500 500F1136/F1136M 112SUMMARY OF CHANGESCommittee F16 has identified the location of selected changes to this standard since the last issue (F113610)that may impact the use of this standard. (Approved November 1, 2011.)(1) Combined standar
33、ds F1136 and F1136M. (2) Revised 6.4.Committee F16 has identified the location of selected changes to this standard since the last issue (F113604)that may impact the use of this standard. (Approved December 1, 2010.)(1) 6.4.1 was added.ASTM International takes no position respecting the validity of
34、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 standard is subject to r
35、evision 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 International Headquarters. Yo
36、ur 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 below.This standard is cop
37、yrighted 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/).F1136/F1136M 113
