<p>This International Standard describes a method that uses an electronic hydrogen detection instrument for measuring</p>
<p>relative, diffusible hydrogen concentrations in bare steels or in plated steels after the coating has been removed. It is</p>
<p>assumed that the hydrogen is uniformly distributed throughout a part.</p>
<p>The method does not measure actual hydrogen concentration. However, oxidation current densities measured</p>
<p>against time provide a useful indication of relative hydrogen concentrations and, therefore, the measurements can be</p>
<p>used for comparison purposes. The method may be used as a quality control procedure as it does provide a quick</p>
<p>means of measuring the effectiveness of pre- and/or post-plating heat treatments or of monitoring hydrogen uptake</p>
<p>during plating or due to corrosion.</p>
<p>It is important to note that the absence of failure in a particular test does not provide confirmation of complete</p>
<p>elimination of hydrogen embrittlement because no one test method can provide all the data necessary to evaluate</p>
<p>the degree of hydrogen degradation.</p>
<p>For unplated parts the method is non-destructive; however, for plated parts the coating has to be removed prior to</p>
<p>measurement by a means proven not to damage the steel or to introduce hydrogen.</p>
<p>This test method is limited to:</p>
<p>— carbon and alloy steels, excluding austenitic stainless steels (see note 1);</p>
<p>— flat specimens to which the cell can be attached (see note 2);</p>
<p>— measurements at room temperature ( ).</p>
<p>NOTE 1 If this method is used for austenitic stainless steels and other face centred cubic (FCC) alloys, measurement times and</p>
<p>interpretation of results will have to be determined because of the different kinetics involved.</p>
<p>NOTE 2 For slightly curved surfaces it is essential to define an area that is reproducible. The area calculation will be different</p>
<p>from that described in this International Standard.</p>
<p>NOTE 3 The method can be applied to small parts, however, this necessitates some modification of the technique, procedure</p>
<p>and interpretation of results.</p>
Registration number (WIID)
25688
Scope
<p>This International Standard describes a method that uses an electronic hydrogen detection instrument for measuring</p>
<p>relative, diffusible hydrogen concentrations in bare steels or in plated steels after the coating has been removed. It is</p>
<p>assumed that the hydrogen is uniformly distributed throughout a part.</p>
<p>The method does not measure actual hydrogen concentration. However, oxidation current densities measured</p>
<p>against time provide a useful indication of relative hydrogen concentrations and, therefore, the measurements can be</p>
<p>used for comparison purposes. The method may be used as a quality control procedure as it does provide a quick</p>
<p>means of measuring the effectiveness of pre- and/or post-plating heat treatments or of monitoring hydrogen uptake</p>
<p>during plating or due to corrosion.</p>
<p>It is important to note that the absence of failure in a particular test does not provide confirmation of complete</p>
<p>elimination of hydrogen embrittlement because no one test method can provide all the data necessary to evaluate</p>
<p>the degree of hydrogen degradation.</p>
<p>For unplated parts the method is non-destructive; however, for plated parts the coating has to be removed prior to</p>
<p>measurement by a means proven not to damage the steel or to introduce hydrogen.</p>
<p>This test method is limited to:</p>
<p>— carbon and alloy steels, excluding austenitic stainless steels (see note 1);</p>
<p>— flat specimens to which the cell can be attached (see note 2);</p>
<p>— measurements at room temperature ( ).</p>
<p>NOTE 1 If this method is used for austenitic stainless steels and other face centred cubic (FCC) alloys, measurement times and</p>
<p>interpretation of results will have to be determined because of the different kinetics involved.</p>
<p>NOTE 2 For slightly curved surfaces it is essential to define an area that is reproducible. The area calculation will be different</p>
<p>from that described in this International Standard.</p>
<p>NOTE 3 The method can be applied to small parts, however, this necessitates some modification of the technique, procedure</p>
<p>and interpretation of results.</p>
