1、Designation: F1137 11Standard Specification forPhosphate/Oil Corrosion Protective Coatings for Fasteners1This standard is issued under the fixed designation F1137; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. 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 for fourgrades of corrosion protection for fasteners. Grade A consistsof a
3、zinc phosphate coating with no additional sealer (dry),Grade B consists of a zinc phosphate coating with a dry organicsealer, Grade C, and Grade D.1.2 This specification is intendedprimarily for fasteners such as nuts, clips, washers, and otherferrous threaded and non-threaded fasteners that require
4、 cor-rosion protection.1.2 This specification is intended primarily for fastenerssuch as nuts, clips, washers, and other ferrous threaded andnon-threaded fasteners that require corrosion protection.1.3 These coatings may or may not have a decorative finish.2. Referenced Documents2.1 ASTM Standards:2
5、B117 Practice for Operating Salt Spray (Fog) ApparatusF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance Inspection3. Classification3.1 The zinc phosphate treatment and subsequent protectivecoatings are classified into four grades according to therequirements s
6、hown in Table 1.4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of parts,4.1.2 Grade required (see Table 1), and4.1.3 Any additions agreed upon between the purchaser andthe supplier.5. Requirements5.1 AppearanceUnless othe
7、rwise agreed upon betweenthe purchaser and the producer, the color of the protectivecoating shall be as-coated gray for Grades A, B, C, and D.5.2 Corrosion ResistanceThese coatings shall be capableof withstanding neutral salt spray for the minimum h specifiedin Table 1 with no base metal corrosion o
8、n significant surfaces.Significant surfaces on threaded fasteners are defined as theexposed surfaces when the fasteners are installed in a normalmanner (bolt head, nut head, face, etc.). On other surfaceswhere control of the coating cannot be obtained under normalprocessing such as holes, recesses,
9、threads, etc., the aboverequirements do not apply.5.3 Thread FitThe maximum thickness of coating whichmay be applied to threads on threaded products is limited bythe basic thread size (see 8.2). Threads may be producedundersize/oversize (before coating) to accommodate the coat-ing thickness, providi
10、ng the finished product (after coating)meets all specified mechanical properties. All undersize/oversize must be within permissible limits as agreed uponbetween the supplier and the purchaser.5.4 Dry-to-TouchGrade C shall be evenly coated anddry-to-touch such that when held with filter paper or equi
11、valentand applying hand pressure for 5 to 10 s, there shall be novisible staining of the filter paper when viewed without use of1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.03 on Coatings onFasteners.Current edit
12、ion approved May 1, 2011. Published May 2011. Originallyapproved in 1988. Last previous edition approved in 2006 as F1137 00(2006).DOI: 10.1520/F1137-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMSt
13、andards volume information, refer to the standards Document Summary page onthe ASTM website.TABLE 1 Classification and Performance Requirements ofProtective CoatingsGrade No. ZincPhosphate,g/m2SupplementalCoatingCoatingThickness, mSalt Spray,hGrade A 11, min none see 5.3 72AGrade B 11, min sealer se
14、e 5.3 72Grade C 11, min protective oil-typecompoundsee 5.3 24Grade D 11, min protective oil-typecompoundsee 5.3 72AWhen testing Grade A finished parts, a protective oil coating shall be addedbefore salt spray testing.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM I
15、nternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.supplementary magnification. For referee purposes, this testshall be performed using a force of 10 N as measured with aload-indicating gage.6. Sampling6.1 The purchaser may request samples in accordance
16、 withPractice F1470.7. Test Methods7.1 The corrosion resistance shall be determined in accor-dance with Practice B117.7.2 The coating thickness may be determined by micro-scopic examination of the cross-section taken perpendicular tothe significant surface or by determining the coating mass(g/m2) by
17、 a weigh-strip-weigh method and then converting toa coating thickness (see Note 1). Coating thickness, for refereepurposes, shall be measured by microscopic examination.NOTE 1The weigh-strip-weigh method involves weighing the testspecimen before and after stripping the deposit with a reagent which d
18、oesnot attack the base metal.The formula used for measuring the thickness of a deposit bythe weigh-strip-weigh method is:T 5WA 3 D3 103where:T = thickness, m,W = mass of deposit, g,A = area of deposit, m2, andD = density of coating, kg/m3.8. Inspection8.1 Samples shall be taken in accordance with Pr
19、acticeF1470.8.2 Referee InspectionThe following referee thread in-spection procedure may be utilized if the specified “go” gagebinds on the screw.8.2.1 Bolt or ScrewAssemble a phosphate-plated test nutwith a 2B or 6H class thread down the full length of the thread.8.2.2 NutAssemble a phosphate-plate
20、d test bolt or screwwith a 2A or 6g class thread for a minimum of one diameterthrough the nut.8.2.3 The test nut or screw/bolt must run freely for the totallength without binding.9. Rejection and Rehearing9.1 Unless otherwise specified, any rejection based on testsspecified herein and made by the pu
21、rchaser shall be reported tothe manufacturer as soon as practical after receipt of theproduct by the purchaser.10. Keywords10.1 coating; corrosion; fasteners; protection; phosphate;resistance; rustSUMMARY OF CHANGESCommittee F16 has identified the location of selected changes to this standard since
22、the last issue(F113700(2006) that may impact the use of this standard.(1) References to Grades I, II and III are removed.(2) The designations to 0A, 0B, 0C, 0D are revised to A, B Cand D.(3) The note” 9Fasteners manufactured from phosphated rawmaterial shall be dephosphated before heat treatment.9 W
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26、TM 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 (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/).F1137 112
