ASTM F1136-2004 Standard Specification for Zinc Aluminum Corrosion Protective Coatings for Fasteners《紧固件用锌 铝防蚀镀层的标准规范》.pdf

1、Designation: F 1136 04Standard Specification forZinc/Aluminum Corrosion Protective Coatings forFasteners1This standard is issued under the fixed designation F 1136; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last r

2、evision. 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 andoptional se

3、alers 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 b

4、y 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 rus

5、t 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 prior to use.2. R

6、eferenced 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 606 Test Methods for Determining the Mechanical Prop-erties of Externally

7、and Internally Threaded Fasteners,Washers, and RivetsF 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 Embrittlement in Plated or Coat

8、edFasteners3. 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 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 i

9、nGrade 1.3.1.2 Grade 2 requires 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 t

10、he clear sealer. Thesealer provides 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

11、 4.3.1.5 Grade 5 requires a minimum 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)

12、 with various pigmented topcoats 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,4.1.2 Grade of coating as given in Table 1,4.1.3 Specify chrome (C) or non-

13、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), and1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility o

14、f Subcommittee F16.03 on Coatings onFasteners.Current edition approved July 1, 2004. Published July 2004. Originally approvedin 1988. Last previous edition approved in 1998 as F 1136 88 (1998)e1.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at

15、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 Conshohocken, PA 19428-2959, United States.4.1.5 Any additions to the specification as agreed

16、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 coating shall show less than 5 % re-moval following the

17、 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 exposure to salt spray test (SST) for the minimumhou

18、rs (h) specified in Table 1. Unless otherwise defined,acceptable corrosion resistance shall be Rust Grade 6 or higher(see Test Method 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

19、.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, 2B GO gage forinternal threads). Where greater

20、 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 the approval of thepurchaser.5.6 Hydrogen Embritt

21、lementWhen 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 B 117 fol

22、lowed by Test Method D 610to rate 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

23、 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 requires areagent that does not attack the base me

24、tal (for example, 20 % NaOH).6.3 AdhesionAdhesion of the coating shall be tested inaccordance with Test Methods D 3359 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 B 117) f

25、or 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 F 606 or F 1940.7. Inspection7.1 When requested by the purchaser, samples shall beacquired in accordance with Guide F 1470.8. Rejection a

26、nd Rehearing8.1 Materials that fail to conform to the requirements of thisspecification shall be rejected.9. Keywords9.1 aluminum; chrome; coating; corrosion; dip spin; fasten-ers; protection; resistance; rust; sealer; zincASTM International takes no position respecting the validity of any patent ri

27、ghts 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 revision at an

28、y 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. Your comments w

29、ill 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 copyrighted by A

30、STM 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);

31、or through the ASTM website(www.astm.org).TABLE 1 Coating ClassificationGradeNo.Topcoat TypeCoatingThicknessAverage(mil)CoatingWeightAverage(oz/ft2)MinimumSSTHours (h)(C) (NC)1 None 0.16 to 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 500F1136042