1、Designation: F519 12 F519 12aStandard Test Method forMechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments1This standard is issued under the fixed designation F519; the number immediately following the designation indicates the year of originaladoption or
2、, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.
3、1 This test method describes mechanical test methods and defines acceptance criteria for coating and plating processes thatcan cause hydrogen embrittlement in steels. Subsequent exposure to chemicals encountered in service environments, such as fluids,cleaning treatments or maintenance chemicals tha
4、t come in contact with the plated/coated or bare surface of the steel, can also beevaluated.1.2 This test method is not intended to measure the relative susceptibility of different steels. The relative susceptibility ofdifferent materials to hydrogen embrittlement may be determined in accordance wit
5、h Test Method F1459 and Test Method F1624.1.3 This test method specifies the use of air melted AISI E4340 steel per SAE AMS-S-5000 (formerly MIL-S-5000) heat treatedto 260 to 280 ksi (pounds per square inch x 1000) 1000) as the baseline. This combination of alloy and heat treat level has beenused fo
6、r many years and a large database has been accumulated in the aerospace industry on its specific response to exposure toa wide variety of maintenance chemicals, or electroplated coatings, or both. Components with ultimate strengths higher than 260to 280 ksi may not be represented by the baseline. In
7、 such cases, the cognizant engineering authority shall determine the needfor manufacturing specimens from the specific material and heat treat condition of the component. Deviations from the baselineshall be reported as required by section 12.1.2. The sensitivity to hydrogen embrittlement shall be d
8、emonstrated for each lot ofspecimens as specified in section 9.5.1.4 Test procedures and acceptance requirements are specified for seven specimens of different sizes, geometries, and loadingconfigurations.1.5 Pass/Fail RequirementsFor plating/coating processes, specimens must meet or exceed 200 h us
9、ing a sustained load test(SLT) at the levels shown in Table 3.1.5.1 The loading conditions and pass/fail requirements for service environments are specified in Annex A5.1.5.2 If approved by the cognizant engineering authority, a quantitative, accelerated ( 24 h) incremental step-load (ISL) testas de
10、fined in Annex A3 may be used as an alternative to SLT.1.6 This test method is divided into two parts. The first part gives general information concerning requirements for hydrogenembrittlement testing. The second is composed of annexes that give specific requirements for the various loading and spe
11、cimenconfigurations covered by this test method (see section 9.1 for a list of types) and the details for testing service environments.1.7 The values stated in the foot-pound-second (fps) system in inch-pound units are to be regarded as standard. The values givenin parentheses are mathematical conve
12、rsions to SI units that are provided for information only and are not considered standard.1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practic
13、es and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B374 Terminology Relating to Electroplating1 This test method is under the jurisdiction of ASTM Committee F07 on Aerospace and Aircraft and is the direct responsibility of Subcommittee
14、 F07.04 on HydrogenEmbrittlement.Current edition approved June 1, 2012Nov. 15, 2012. Published September 2012December 2012. Originally approved in 1977. Last previous edition approved in 20102012as F519 10.F519 12. DOI: 10.1520/F0519-12.10.1520/F0519-12A.2 For referenced ASTM standards, visit the AS
15、TM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an i
16、ndication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to b
17、e considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1B851 Specification for Automated Controlled Shot Peening of Metallic Articles Prior to Nickel, Autocatalytic Nickel, orChromium Plating, or as Final Fi
18、nishD1193 Specification for Reagent WaterE4 Practices for Force Verification of Testing MachinesE8E8/E8M Test Methods for Tension Testing of Metallic MaterialsE18 Test Methods for Rockwell Hardness of Metallic MaterialsE29 Practice for Using Significant Digits in Test Data to Determine Conformance w
19、ith SpecificationsE292 Test Methods for Conducting Time-for-Rupture Notch Tension Tests of MaterialsE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test MethodE709 Guide for Magnetic Particle TestingE1417 Practice for Liquid Penetrant TestingE1444 Practice for M
20、agnetic Particle TestingE1823 Terminology Relating to Fatigue and Fracture TestingF1459 Test Method for Determination of the Susceptibility of Metallic Materials to Hydrogen Gas Embrittlement (HGE)F1624 Test Method for Measurement of Hydrogen Embrittlement Threshold in Steel by the Incremental Step
21、Loading TechniqueF2078 Terminology Relating to Hydrogen Embrittlement TestingG5 Reference Test Method for Making Potentiostatic and Potentiodynamic Anodic Polarization MeasurementsG38 Practice for Making and Using C-Ring Stress-Corrosion Test Specimens2.2 SAE AMS Standard:3AMS 2430 (R) Shot Peening,
22、 AutomaticAMS 2759/2 Heat Treatment of Low-Alloy Steel Parts Minimum Tensile Strength 220 ksi (1517 MPa) and Higher3 Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http:/www.sae.org.TABLE 1 Lot Acceptance Criteria for Notched SpecimensType Item
23、 Sampling ofEach Lot Requirement/Method1 Tensile Strength 4 eachTest Method E8. Tensilestrength of each specimenmust be within 10 ksi of theaverage.1 HardnessA 5 % 51 to 53 HRC per TestMethods E18.Round the average ofthree readings perspecimen per PracticeE29.1 Dimensions 100 % Meet tolerances ofcor
24、respondingdrawings. Notchdimension verified withshadow graphicprojection at 50 to100 or equivalent.1 Notched FractureStrength (NFS)10 ea Test Methods E8. NFS of eachspecimenmust be within 10 ksiof the average.1 Notched FractureStrength (NFS)10 ea Test Methods E8/E8M. NFS ofeach specimenmust be withi
25、n 10 ksiof the average.1c Self-loadingnotched roundspecimen bendfixture, Fig. A2.710 ea Alternate: The number ofturns of the loadingbolt, which is requiredto produce fracture ineach specimen, must bewithin 5 % of theaverage.1d Self-loadingnotched C-Ringbend fixture,Fig. A2.810 ea Alternate: The chan
26、ge indiameter at fractureload for each specimenmust be within 0.008inches of the average.A If the hardness requirements of any of the sampled specimens are not satisfied,only those specimens of the lot that are individually inspected for conformance tothese requirements shall be used for testing.F51
27、9 12a2AMS 2759/11 Stress Relief of Steel PartsAMS 6360 Steel Tubing, Seamless 0.95Cr 0.20Mo (0.28 0.33C) (SAE 4130) Normalized or Stress RelievedAMS-QQ-P-416 Plating, Cadmium (Electrodeposited)AMS-S-5000 Steel, Chrome-Nickel-Molybdenum (E4340) Bars and Reforging Stock2.3 Military and Federal Standar
28、ds and Commercial Item Descriptions:4MIL-PRF-16173 Corrosion Preventive Compound, Solvent Cutback, Cold-ApplicationCommercial Item Description (CID) A-A-55827 Chromium Trioxide, Technical3. Terminology3.1 DefinitionsDefinitions of terms used in this test method may be found in Terminology B374, Term
29、inology E1823 andTerminology F2078.3.2 Acronyms and Abbreviations:AISI = American Iron and Steel Institutea/W = notch depth-to-width ratiod/D = ratio of minor to major diameters at the notchESH = Environmental, Safety and Healthfps = foot pound secondHRC = Rockwell Hardness Scale CID = inside diamet
30、erISL = incremental step loadkip = pounds load multiplied by 10004 Copies of these documents are available at http:/assist.daps.dla.mil/quicksearch/ or http:/assist.daps.dla.mil or from the Standardization Document Order Desk, 700Robins Ave., Building 4D, Philadelphia, PA 19111-5094.TABLE 2 Electrop
31、lating Bath Compositions and Operating Conditions for Sensitivity TestItem Treatment A Treatment BBath composition: Range OptimumCadmium (as CdO) 2.9 to 5.5 oz/gal (22 to41 g/L)4.5 oz/gal (33.7 g/L) same as Treatment ATotal Sodium cyanide(NaCN)12.0 to 16.0 oz/gal (89.9to 120 g/L)14 oz/gal (104 g/L)
32、same as Treatment ARatio NaCN to CdO 2.8/1 to 6.0/1 3.0/1 same as Treatment ApH 12.0 or greater 12.0 same as Treatment ATemperature 7090F (2132C) 75F (24C) same as Treatment ASodium hydroxide(NaOH)A1.0 to 3.2 oz/gal (7.5 to24.0 g/L)2.5 oz/gal (18.7 g/L) same as Treatment ABrightener such asColcad 10
33、0B orequivalentManufacturers suggested range NoneElectroplating current 10 A/ft2 (108 A/m2) 60 A/ft2 (645 A/m2)Electroplating time 30 minutes 6 minutesBakingBaking temperature 375 25F (190 14C) same as Treatment ABaking time: Type 1SpecimenDo Not Bake 23 hBaking time: Type 2aSpecimen8 h 23 hChromate
34、 TreatmentC Yes same as Treatment AA Addition of sodium hydroxide may not be required on solution makeup, since the addition of 1 oz/gal of cadmium oxide is equivalent to 0.6 oz/gal of free hydroxide.BThe sole source of manufacture of Colcad 100 known to the committee at this time is Columbia Chemic
35、al in Brunswick, Ohio, . If you areaware of alternative manufacturers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meetingof the responsible technical committee, which you may attend.C After baking, the specimens shall be
36、dipped into any appropriate chromate conversion coating solution for minimum time that will produce an adherent and continuouscoating as described in AMS-QQ-P-416 Type II.TABLE 3 Pass/Fail Loading Requirements of Test SpecimensType 1a, 1b, 1c, 1d, 1e 75 % of the tensile or bend NFS (Table 1).Type 2a
37、 92 % of the Test Methods E8, E4 ultimate strength, ob-tained by deflecting a 2.300-inch diameter O-Ringspecimen with a 2.525-inch stressing bar.Type 2a 92 % of the Test Methods E8/E8M, E4 ultimatestrength, obtained by deflecting a 2.300-inch diameterO-Ring specimen with a 2.525-inch stressing bar.F
38、519 12a3ksi = pounds-force per square inch multiplied by 1000Kt = stress concentration factorLS = longitudinal short transverseNFS = notched fracture strengthOD = outside diameterpsi = pounds-force per square inchRMS = root mean squareSAE AMS = Society of Automotive Engineers Aerospace Material Spec
39、ificationSCE = saturated calomel electrodeSLT = sustained load testT.I.R. = total indicated runout4. Summary of Test Methods4.1 Plating/coating ProcessesUnstressed test specimens are cleaned, plated/coated, and baked (if applicable) in accordancewith the specification to which the process is to be q
40、ualified. Specimens are then maintained under a sustained load in air tomeasure the time to rupture/completion of the test period.4.2 Service EnvironmentsSpecimens are tested in the service environment. The sequence of exposure to the environment andloading shall be as defined in Annex A5. If plated
41、/coated test specimens are to be utilized for evaluating a service environment,then the plating/coating process must first be determined to be acceptable in accordance with section 4.1.5. Significance and Use5.1 Plating/coating ProcessesThis test method provides a means by which to detect possible h
42、ydrogen embrittlement of steelparts during manufacture by verifying strict controls during production operations such as surface preparation, pretreatments, andplating/coating. It is also intended to be used as a qualification test for new plating/coating processes and as a periodic inspectionaudit
43、for the control of a plating/coating process.5.2 Service EnvironmentThis test method provides a means by which to detect possible hydrogen embrittlement of steel parts(plated/coated or bare) due to contact with chemicals during manufacturing, overhaul and service life. The details of testing in aser
44、vice environment are found in Annex A5.6. Apparatus6.1 Testing MachineTesting machines shall be within the guidelines of calibration, force range, resolution, bending strain, andverification of Practices E4. and Test Methods E292 as applicable.6.2 Gripping DevicesVarious types of gripping devices ma
45、y be used in either tension or bending to transmit the load appliedby the testing machine or self-loading frame to the test specimen.6.3 Series LoadingSamples may be loaded on a test frame either individually or by multiples in series. All specimens loadedonto an individual test frame shall have the
46、 same certified NFS 6 1 %. In the event that one or more of the specimens fractureduring the designated test period, the fractured specimen(s) shall be removed, replaced with a dummy specimen and the load chainplaced back under load. The total time under load (that is, test duration) for the remaini
47、ng specimens shall be extended by anytime-off-load as detailed in 6.3.1. The procuring specification or cognizant engineering authority may elect to restrict loading toone specimen per test frame.6.3.1 Extended Time Under Load (ETUL)If the total time-off-load (wall clock) exceeds 10 % of the total t
48、est duration (forexample. 20-h for a 200-h test); then the time under load shall be extended by the amount of time-off-load in excess of 10 % (thatis, in excess of 20 h). The procuring specification or cognizant engineering authority may elect to waive this extended time underload (ETUL) protocol.EX
49、AMPLE 1 for SLTFour cadmium-plated specimens representing a single plating bath are loaded on an individual SLT test frame as part of a monthly plating bath verification. One ofthe four specimens fractures after 180 h (initial time under load = 180 h). It takes 8 h to discover the fractured specimen, replace it with a dummy link, and put theremaining three specimens back under load (time off-load = 8 h). No extension of time under load is required since the time off-load (8 h) was less than 10 % of thetotal test durati
