1、Designation: F1136 10Standard Specification forZinc/Aluminum Corrosion Protective Coatings forFasteners1This standard is issued under the fixed designation F1136; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last rev
2、ision. 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 specification covers the basic requirements forwater-based zinc/aluminum dispersion inorganic basecoats andoptional seal
3、ers 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 adversely affected by
4、baking temperatures up to626F.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 blasting to remove rust
5、or scale.1.4 The values stated in inch-pound units are to be regardedas standard. No other units of measurement are included in thisstandard.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
6、to establish 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) ApparatusD610 Practice for Evaluating Degree of Rusting on PaintedSteel SurfacesD3359
7、Test Methods for Measuring Adhesion by Tape TestF606 Test Methods for Determining the Mechanical Prop-erties of Externally and Internally Threaded Fasteners,Washers, Direct Tension Indicators, and RivetsF1624 Test Method for Measurement of Hydrogen Em-brittlement Threshold in Steel by the Incrementa
8、l StepLoading TechniqueF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1789 Terminology for F16 Mechanical FastenersF1940 Test Method for Process Control Verification toPrevent Hydrogen Embrittlement in Plated or CoatedFasteners3. Classification3.
9、1 These coatings are classified into six grades according tothe requirements in Table 1.3.1.1 Grade 1 requires a minimum basecoat thickness of0.16 mil (0.052 oz/ft2). This is usually applied in two coats tobulk parts, or one coat to racked parts. No topcoat is applied inGrade 1.3.1.2 Grade 2 require
10、s a minimum basecoat thickness of0.20 mil (0.066 oz/ft2). This is usually applied in two coats tobulk parts, or one coat to racked parts. No topcoat is applied inGrade 2.3.1.3 Grade 3 requires a minimum basecoat thickness of0.20 mil (0.066 oz/ft2) and a single coat of the clear sealer. Thesealer pro
11、vides additional corrosion protection and greaterlubricity than Grade 2.3.1.4 Grade 4 requires a minimum basecoat thickness of0.31 mil (0.092 oz/ft2). This is usually applied in three coats tobulk parts, or one to two coats to racked parts. No topcoat isapplied in Grade 4.3.1.5 Grade 5 requires a mi
12、nimum basecoat thickness of0.20 mil (0.066 oz/ft2) and a single coat of the lubricated sealer.The sealer provides additional corrosion protection than Grade2 and greater lubricity than Grade 3.3.1.6 Grade 6 requires a minimum basecoat thickness of0.20 mil (0.066 oz/ft2) with various pigmented topcoa
13、ts ap-plied. The topcoats 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,1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct respons
14、ibility of Subcommittee F16.03 on Coatings onFasteners.Current edition approved Dec. 1, 2010. Published January 2011. Originallyapproved in 1988. Last previous edition approved in 2004 as F113604. DOI:10.1520/F1136-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact AS
15、TM Customer Service at serviceastm.org. For Annual Book of ASTMStandards 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 Consh
16、ohocken, PA 19428-2959, United States.4.1.2 Grade of coating 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
17、.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 tears and other discontinuities which may affectthe appearance or performance of the coating, or both.5.2 AdhesionThe coati
18、ng 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 indicates poor adhesion and is cause forrejection.5.3 Corrosion ResistanceThe coating shall be capable ofwithstanding ex
19、posure 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 Method D610 for definition) on significant surfaces(see Terminology F1789 for definition).5.4 BlistersThere shall be no sig
20、ns 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 proper GO thread gage.5.5.1 The thickness of the coating is limited by the basicthread size (3A GO gage for external threads
21、, 2B GO gage forinternal threads). Where greater thickness 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 t
22、he 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 phosphating to guarantee theabsence of internal hydrogen embrittlement.6. Test Methods6.1 CorrosionCorrosion resistance shall
23、be tested in ac-cordance with Practice B117 followed by 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 signific
24、ant 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.NOTE 1The weigh-strip-weigh method involves weighing the testspecimen before and after the coating is stripped. The method requ
25、ires 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 D3359 Scribe-Grid Test, wherepractical. Determination if base material is exposed may bedone by visually inspecting the part, or exposing the
26、part to saltspray test (see Practice B117) for 96 h and observing if red rustoccurs.6.4 Hydrogen EmbrittlementWhen specified in the pur-chase order, testing shall be conducted in accordance with TestMethods F606 or F1940.6.4.1 In the event that hardness reductions occur in testspecimens due to coati
27、ng curing times and temperatures,testing shall be conducted alternatively in accordance with TestMethod 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
28、thisspecification shall be rejected.9. Keywords9.1 aluminum; chrome; coating; corrosion; dip spin; fasten-ers; protection; resistance; rust; sealer; zincTABLE 1 Coating ClassificationGradeNo.Topcoat TypeCoatingThicknessAverage(mil)CoatingWeightAverage(oz/ft2)MinimumSSTHours (h)(C) (NC)1 None 0.16 to
29、 0.20 0.052 to 0.066 240 -2 None 0.20 to 0.31 0.066 to 0.092 500 2403 Clear Sealer 0.24 to 0.47 0.072 to 0.111 1000 7204 None 0.31 to 0.59 0.092 to 0.164 1000 5005 Lubricated Sealer 0.24 to 0.47 0.072 to 0.111 1000 7206 Pigmented Topcoat 0.31 to 0.59 0.075 to 0.131 500 500F1136 102SUMMARY OF CHANGES
30、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.(1) 6.4.1 was added.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin
31、 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 revision at any time by the responsible technical committee and mus
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33、responsible 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 copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700
34、, 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 103
