ASTM F519-12

    Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments


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    1. Scope

    1.1 This test method describes mechanical test methods and defines acceptance criteria for coating and plating processes that can cause hydrogen embrittlement in steels. Subsequent exposure to chemicals encountered in service environments, such as fluids, cleaning treatments or maintenance chemicals that come in contact with the plated/coated or bare surface of the steel, can also be evaluated.

    1.2 This test method is not intended to measure the relative susceptibility of different steels. The relative susceptibility of different materials to hydrogen embrittlement may be determined in accordance with 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 treated to 260 280 ksi (pounds per square inch x 1000) as the baseline. This combination of alloy and heat treat level has been used for many years and a large database has been accumulated in the aerospace industry on its specific response to exposure to a wide variety of maintenance chemicals, or electroplated coatings, or both. Components with ultimate strengths higher than 260 280 ksi may not be represented by the baseline. In such cases, the cognizant engineering authority shall determine the need for manufacturing specimens from the specific material and heat treat condition of the component. Deviations from the baseline shall be reported as required by section 12.1.2. The sensitivity to hydrogen embrittlement shall be demonstrated for each lot of specimens as specified in section 9.5.

    1.4 Test procedures and acceptance requirements are specified for seven specimens of different sizes, geometries, and loading configurations.

    1.5 Pass/Fail RequirementsFor plating/coating processes, specimens must meet or exceed 200 h using 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) test as defined 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 hydrogen embrittlement testing. The second is composed of annexes that give specific requirements for the various loading and specimen configurations 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 given in parentheses are mathematical conversions 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 responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    TABLE 1 Lot Acceptance Criteria for Notched Specimens

    TypeItemSampling of
    Each Lot
    Requirement/Method
    1Tensile Strength4 eachTest Method E8. Tensile strength of each specimen must be within 10 ksi of the average.
    1 HardnessA 5 %51 to 53 HRC per Test Methods E18.
    Round the average of
    three readings per
    specimen per Practice
    E29.
    1 Dimensions100 %Meet tolerances of
    corresponding
    drawings. Notch
    dimension verified with
    shadow graphic
    projection at 50 to
    100× or equivalent.
    1 Notched Fracture Strength (NFS)10 eaTest Methods E8. NFS of each specimen
    must be within 10 ksi
    of the average.
    1c Self-loading
    notched round
    specimen bend
    fixture, Fig. A2.7
    10 eaAlternate: The number of
    turns of the loading
    bolt, which is required
    to produce fracture in
    each specimen, must be
    within 5 % of the
    average.
    1d Self-loading
    notched C-Ring
    bend fixture,
    Fig. A2.8
    10 eaAlternate: The change in
    diameter at fracture
    load for each specimen
    must be within 0.008
    inches 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 to these requirements shall be used for testing.

    TABLE 2 Electroplating Bath Compositions and Operating Conditions for Sensitivity Test

    ItemTreatment ATreatment B
    Bath composition:RangeOptimum
    Cadmium (as CdO)2.9 to 5.5 oz/gal (22 to 41 g/L)4.5 oz/gal (33.7 g/L)same as Treatment A
    Total Sodium cyanide
    (NaCN)
    12.0 to 16.0 oz/gal (89.9 to 120 g/L)14 oz/gal (104 g/L)same as Treatment A
    Ratio NaCN to CdO2.8/1 to 6.0/13.0/1same as Treatment A
    pH12.0 or greater12.0same as Treatment A
    Temperature7090°F (2132°C)75°F (24°C)same as Treatment A
    Sodium hydroxide
    (NaOH)A
    1.0 to 3.2 oz/gal (7.5 to 24.0 g/L)2.5 oz/gal (18.7 g/L)same as Treatment A
    Brightener such as
    Colcad 100B or
    equivalent
    Manufacturer's suggested rangeNone
    Electroplating current10 A/ft2 (108 A/m2)60 A/ft2 (645 A/m 2)
    Electroplating time30 minutes6 minutes
    Baking
    Baking temperature375 ± 25°F (190 ± 14°C)same as Treatment A
    Baking time: Type 1
    Specimen
    Do Not Bake23 h
    Baking time: Type 2a
    Specimen
    8 h23 h
    Chromate TreatmentCYessame as Treatment A

    A 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.

    B The sole source of manufacture of Colcad 100 known to the committee at this time is Columbia Chemical in Brunswick, Ohio, www.columbiachemical.com. If you are aware of alternative manufacturers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

    C After baking, the specimens shall be dipped into any appropriate chromate conversion coating solution for minimum time that will produce an adherent and continuous coating as described in AMS-QQ-P-416 Type II.

    TABLE 3 Pass/Fail Loading Requirements of Test Specimens

    Type 1a, 1b, 1c, 1d, 1e75 % of the tensile or bend NFS (Table 1).
    Type 2a92 % of the Test Methods E8, E4 ultimate strength, obtained by deflecting a 2.300-inch diameter O-Ring specimen with a 2.525-inch stressing bar.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    SAE AMS Standard

    AMS 2430 (R) Shot Peening, Automatic

    AMS 2759/11 Stress Relief of Steel Parts

    AMS 6360

    AMS 6414 Steel, Bars, Forgings, and Tubing (SAE 4340) Vacuum Consumable Electrode Remelted

    AMS-QQ-P-416 Plating, Cadmium (Electrodeposited)

    ASTM Standards

    B374 Terminology Relating to Electroplating

    B851 Specification for Automated Controlled Shot Peening of Metallic Articles Prior to Nickel, Autocatalytic Nickel, or Chromium Plating, or as Final Finish

    D1193 Specification for Reagent Water

    E4 Practices for Force Verification of Testing Machines

    E8/E8M Test Methods for Tension Testing of Metallic Materials

    E18 Test Methods for Rockwell Hardness of Metallic Materials

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E292 Test Methods for Conducting Time-for-Rupture Notch Tension Tests of Materials

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    E709 Guide for Magnetic Particle Testing

    E1417 Practice for Liquid Penetrant Testing

    E1444 Practice for Magnetic Particle Testing

    E1823 Terminology Relating to Fatigue and Fracture Testing

    F1459 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 Loading Technique

    F2078 Terminology Relating to Hydrogen Embrittlement Testing

    G5 Reference Test Method for Making Potentiodynamic Anodic Polarization Measurements

    G38 Practice for Making and Using C-Ring Stress-Corrosion Test Specimens

    Military and Federal Standards and Commercial Item Descriptions

    Commercial Item Description (CID) A-A-55827

    MIL-PRF-16173


    ICS Code

    ICS Number Code 25.220.40 (Metallic coatings)

    UNSPSC Code

    UNSPSC Code 11101704(Steel)


    Referencing This Standard
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    DOI: 10.1520/F0519-12

    Citation Format

    ASTM F519-12, Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments , ASTM International, West Conshohocken, PA, 2012, www.astm.org

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