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  • BSI
    BS ISO 15724:2001 Metallic and other inorganic coatings. Electrochemical measurement of diffusible hydrogen in steels. Barnacle electrode method
    Edition: 2001
    $316.70
    / user per year

Description of BS ISO 15724:2001 2001

This International Standard describes a method that uses an electronic hydrogen detection instrument for measuring relative, diffusible hydrogen concentrations in bare steels or in plated steels after the coating has been removed. It is assumed that the hydrogen is uniformly distributed throughout a part.

The method does not measure actual hydrogen concentration. However, oxidation current densities measured against time provide a useful indication of relative hydrogen concentrations and, therefore, the measurements can be used for comparison purposes. The method may be used as a quality control procedure as it does provide a quick means of measuring the effectiveness of pre- and/or post-plating heat treatments or of monitoring hydrogen uptake during plating or due to corrosion.

It is important to note that the absence of failure in a particular test does not provide confirmation of complete elimination of hydrogen embrittlement because no one test method can provide all the data necessary to evaluate the degree of hydrogen degradation.

For unplated parts the method is non-destructive; however, for plated parts the coating has to be removed prior to measurement by a means proven not to damage the steel or to introduce hydrogen.

This test method is limited to:

  • carbon and alloy steels, excluding austenitic stainless steels (see note 1);

  • flat specimens to which the cell can be attached (see note 2);

  • measurements at room temperature (25 °C ± 1 °C).

NOTE 1 If this method is used for austenitic stainless steels and other face centred cubic (FCC) alloys, measurement times and interpretation of results will have to be determined because of the different kinetics involved.

NOTE 2 For slightly curved surfaces it is essential to define an area that is reproducible. The area calculation will be different from that described in this International Standard.

NOTE 3 The method can be applied to small parts, however, this necessitates some modification of the technique, procedure and interpretation of results.



Standard NumberBS ISO 15724:2001
TitleMetallic and other inorganic coatings. Electrochemical measurement of diffusible hydrogen in steels. Barnacle electrode method
StatusUnder Review
Publication Date2001-12-21
Identical National Standard OfISO 15724:2001
DescriptorsHydrogen, Coatings technology, Steels, Metal coatings, Electro-analytical methods, Diffusion, Chemical analysis and testing
ICS25.220.99 Other treatments and coatings, 25.220.40 Metallic coatings
CommitteeSTI/33
ISBN0 580 38800 X
PublisherBSI
Pages20

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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