ASTM F326-23

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Designation: F326 − 17 F326 − 23
Standard Test Method for
Electronic Measurement for Hydrogen Embrittlement From
1
Cadmium-Electroplating Processes
This standard is issued under the fixed designation F326; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers an electronic hydrogen detection instrument procedure for measurement of plating permeability to
hydrogen. This method measures a variable related to hydrogen absorbed by steel during plating and to the hydrogen permeability
of the plate during post plate baking. A specific application of this method is controlling cadmium-plating processes in which the
plate porosity relative to hydrogen is critical, such as cadmium on high-strength steel.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use. For specific hazard statement, see Section 8.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D1193 Specification for Reagent Water
F519 Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 hydrogen pressure peak—the maximum hydrogen pressure value (see I ) obtained when the probe is heated following
H
calibration, plating, or fluid testing.
3.2 Symbols:
3.2.1 HP = calibration hydrogen pressure peak.
3.2.2 HP = plating hydrogen pressure peak.
p
1
This test method is under the jurisdiction of ASTM Committee F07 on Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.04 on Hydrogen
Embrittlement.
Current edition approved Dec. 1, 2017Jan. 1, 2023. Published January 2018February 2023. Originally approved in 1978. Last previous edition approved in 20122017 as
F326 – 96 (2012).F326 – 17. DOI: 10.1520/F0326-17.10.1520/F0326-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
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F326 − 23
3.2.3 I or I = probe cathode emission current.
E e
3.2.4 I = probe hydrogen pressure.
H
3.2.5 I = integral of I curve from probe on to HP.
γ H
3.2.6 lambda = time in seconds for hydrogen pressure peak to drop to half its value.
3.2.7 λ = lambda obtained from a calibration run.
3.2.8 λ = lambda obtained from a plating run.
p
3.2.9 λ = normalized test lambda, obtained as follows:
pc
λ 5 λ ~40/λ! (1)
pc p
¯
3.2.10 λ = arithmetic average of normalized lambdas for a set of tests.
pc
3.2.11 range = difference between maximum λ and minimum λ for a given set of tests.
pc pc
3.2.12 run = calibration or plating of a probe.
3.2.13 test = single evaluation of a plating solution for hydrogen embrittlement determination; run using a previously calibrated
probe.
3.2.14 set of tests—all consecutive tests on a plating solution for a given operator-instrument-day evaluation.
3.2.15 window—test surface of a probe described in Fig. 1(A).
4. Summary of Test Method
4.1 This method uses a metal-shelled vacuum probe as an ion gage to evaluate electrodeposited cadmium characteristics relative
to hydrogen permeation. After calibration, a section of the probe shell is electroplated at the lowest current density encountered
in the cadmium electroplating process. During the subsequent baking of the probe at a closely controlled temperature, the probe
ion current, proportional to hydrogen pressure, is recor
...