EN ISO 17081:2008
(Main)Method of measurement of hydrogen permeation and determination of hydrogen uptake and transport in metals by an electrochemical technique (ISO 17081:2004)
Method of measurement of hydrogen permeation and determination of hydrogen uptake and transport in metals by an electrochemical technique (ISO 17081:2004)
ISO 17081:2004 specifies a laboratory method for the measurement of hydrogen permeation and for the determination of hydrogen atom uptake and transport in metals, using an electrochemical technique. The term "metal" as used in this International Standard includes alloys.
This International Standard describes a method for evaluating hydrogen uptake in metals, based on measurement of steady-state hydrogen flux. It also describes a method for determining effective diffusivity of hydrogen atoms in a metal and for distinguishing reversible and irreversible trapping.
ISO 17081:2004 gives requirements for the preparation of specimens, control and monitoring of the environmental variables, test procedures and analysis of results.
This International Standard may be applied, in principle, to all metals for which hydrogen permeation is measurable and the method can be used to rank the relative aggressivity of different environments in terms of the hydrogen uptake of the exposed metal.
Elektrochemisches Verfahren zur Messung der Wasserstoffpermeation und zur Bestimmung von Wasserstoffaufnahme und -transport in Metallen (ISO 17081:2004)
1.1 In dieser Internationalen Norm wird ein elektrochemisches Laboratoriumsverfahren zur Messung der Wasserstoffpermeation und zur Bestimmung der Aufnahme und des Transports von Wasserstoffatomen in Metallen festgelegt. In dieser Internationalen Norm werden mit der Benennung Metall auch Legierungen erfasst.
1.2 Diese Internationale Norm beschreibt ein Verfahren zur Bewertung der Wasserstoffaufnahme in Metallen, das auf der Messung der Wasserstoffströmung (des Wasserstoffflusses) im stationären Zustand beruht. Ferner werden Verfahren zur Bestimmung des effektiven Diffusionsvermögens von Wasserstoffatomen in einem Metall und zur Unterscheidung reversibler und irreversibler Fehlstellen beschrieben.
1.3 In dieser Internationalen Norm werden Anforderungen an die Vorbereitung der Proben, die Kontrolle und Überwachung der Umgebungsvariablen, die Prüfverfahren und die Auswertung der Ergebnisse festgelegt.
1.4 Diese Internationale Norm darf prinzipiell auf alle Metalle, bei denen Wasserstoffpermeation messbar ist, angewendet werden, und das Verfahren kann zur Klassifizierung der relativen Aggressivität unterschiedlicher Umgebungen in Bezug auf die Wasserstoffaufnahme des beanspruchten Metalls angewendet werden
Méthode de mesure de la perméation de l'hydrogène et détermination de l'absorption d'hydrogène et de son transport dans les métaux à l'aide d'une technique électrochimique (ISO 17081:2004)
L'ISO 17081:2004 spécifie une méthode de laboratoire pour le mesurage de la perméation de l'hydrogène et la détermination de l'absorption et du transport des atomes d'hydrogène dans les métaux à l'aide d'une technique électrochimique. Le terme «métal» utilisé dans la présente Norme internationale comprend les alliages.
L'ISO 17081:2004 décrit une méthode permettant d'évaluer l'absorption d'hydrogène dans les métaux sur la base du mesurage d'un flux stationnaire d'hydrogène. Elle décrit également une méthode permettant de déterminer le coefficient de diffusion effective des atomes d'hydrogène dans un métal et de faire une distinction entre le piégeage réversible et le piégeage irréversible.
L'ISO 17081:2004 fournit des exigences concernant la préparation des éprouvettes, le contrôle et le suivi des variables environnementales, les méthodes d'essai et l'analyse des résultats.
L'ISO 17081:2004 peut s'appliquer, en principe, à tous les métaux pour lesquels la perméation de l'hydrogène est mesurable et la méthode peut être utilisée pour classer l'agressivité relative de différents environnements en termes d'absorption d'hydrogène par le métal exposé.
Metoda merjenja prodiranja vodika ter določanje njegovega vpijanja in prenosa v kovinah z elektrokemijsko tehniko (ISO 17081:2004)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2008
0HWRGDPHUMHQMDSURGLUDQMDYRGLNDWHUGRORþDQMHQMHJRYHJDYSLMDQMDLQSUHQRVDY
NRYLQDK]HOHNWURNHPLMVNRWHKQLNR ,62
Method of measurement of hydrogen permeation and determination of hydrogen uptake
and transport in metals by an electrochemical technique (ISO 17081:2004)
Méthode de mesure de la perméation de l'hydrogene et détermination de l'absorption
d'hydrogene et de son transport dans les métaux a l'aide d'une technique
électrochimique (ISO 17081:2004)
Ta slovenski standard je istoveten z: EN ISO 17081:2008
ICS:
77.060 Korozija kovin Corrosion of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 17081
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2008
ICS 77.060
English Version
Method of measurement of hydrogen permeation and
determination of hydrogen uptake and transport in metals by an
electrochemical technique (ISO 17081:2004)
Méthode de mesure de la perméation de l'hydrogène et Elektrochemisches Verfahren zur Messung der
détermination de l'absorption d'hydrogène et de son Wasserstoffpermeation und zur Bestimmung von
transport dans les métaux à l'aide d'une technique Wasserstoffaufnahme und -transport in Metallen (ISO
électrochimique (ISO 17081:2004) 17081:2004)
This European Standard was approved by CEN on 21 March 2008.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17081:2008: E
worldwide for CEN national Members.
Contents Page
Foreword.3
Foreword
The text of ISO 17081:2004 has been prepared by Technical Committee ISO/TC 156 “Corrosion of metals and
alloys” of the International Organization for Standardization (ISO) and has been taken over as EN ISO
17081:2008 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” the secretariat of
which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by October 2008, and conflicting national standards shall be withdrawn at
the latest by October 2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 17081:2004 has been approved by CEN as a EN ISO 17081:2008 without any modification.
INTERNATIONAL ISO
STANDARD 17081
First edition
2004-11-01
Method of measurement of hydrogen
permeation and determination of
hydrogen uptake and transport in metals
by an electrochemical technique
Méthode de mesure de la perméation de l'hydrogène et détermination
de l'absorption d'hydrogène et de son transport dans les métaux à l'aide
d'une technique électrochimique
Reference number
ISO 17081:2004(E)
©
ISO 2004
ISO 17081:2004(E)
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©
ii ISO 2004 – All rights reserved
ISO 17081:2004(E)
Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 Principle . 3
6 Samples . 4
6.1 Dimensions . 4
6.2 Preparation . 5
7 Apparatus . 5
8 Test environment considerations . 7
9 Test procedure . 8
10 Control and monitoring of test environment . 9
11 Analysis of results . 10
11.1 General . 10
11.2 Analysis of steady-state current . 10
11.3 Analysis of permeation transient . 10
12 Test report . 13
Annex A (informative) Recommended test environments for specific alloys . 14
Bibliography . 16
©
ISO 2004 – All rights reserved iii
ISO 17081:2004(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 17081 was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.
©
iv ISO 2004 – All rights reserved
INTERNATIONAL STANDARD ISO 17081:2004(E)
Method of measurement of hydrogen permeation and
determination of hydrogen uptake and transport in metals by an
electrochemical technique
1Scope
1.1 This International Standard specifies a laboratory method for the measurement of hydrogen permeation
and for the determination of hydrogen atom uptake and transport in metals, using an electrochemical technique.
The term “metal” as used in this International Standard includes alloys.
1.2 This International Standard describes a method for evaluating hydrogen uptake in metals, based on
measurement of steady-state hydrogen flux. It also describes a method for determining effective diffusivity of
hydrogen atoms in a metal and for distinguishing reversible and irreversible trapping.
1.3 This International Standard gives requirements for the preparation of specimens, control and monitoring of
the environmental variables, test procedures and analysis of results.
1.4 This International Standard may be applied, in principle, to all metals for which hydrogen permeation is
measurable and the method can be used to rank the relative aggressivity of different environments in terms of
the hydrogen uptake of the exposed metal.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
1)
ISO 17475:— , Corrosion of metals and alloys — Electrochemical test methods — Guidelines for conducting
potentiostatic and potentiodynamic polarization measurements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
charging
method of introducing atomic hydrogen into the metal by exposure to an aqueous environment under
galvanostatic control (constant charging current), potentiostatic control (constant electrode potential), free
corrosion or by gaseous exposure
3.2
charging cell
compartment in which hydrogen atoms are generated on the sample surface, including both aqueous and
gaseous charging
1) To be published.
©
ISO 2004 – All rights reserved 1
ISO 17081:2004(E)
3.3
decay current
decay of the hydrogen atom oxidation current, after attainment of steady state, following a decrease in charging
current
3.4
Fick's second law
second-order differential equation describing, in this case, the concentration of atomic hydrogen in the sample
as a function of position and time
2 2
NOTE The equation is of the form ∂C(x,t)/t=D∂ C(x,t)/∂x for lattice diffusion in one dimension where diffusivity is
independent of concentration. See Table 1 for an explanation of the symbols.
3.5
hydrogen flux
amount of hydrogen passing through the metal sample per unit area per unit time
3.6
hydrogen uptake
atomic hydrogen absorbed into the metal as a result of charging
3.7
irreversible trap
microstructural site at which the residence time for a hydrogen atom is infinite or extremely long compared to
the time-scale for permeation testing at the relevant temperature
3.8
mobile hydrogen atoms
hydrogen atoms in interstitial sites in the lattice (lattice sites) and reversible trap sites
3.9
oxidation cell
compartment in which hydrogen atoms exiting from the metal sample are oxidized
3.10
permeation current
current measured in oxidation cell associated with oxidation of hydrogen atoms
3.11
permeation flux
hydrogen flux exiting the test sample in the oxidation cell
3.12
permeation transient
variation of the permeation current with time, from commencement of charging to the attainment of steady state,
or modification of charging conditions
3.13
recombination poison
chemical within the test environment in the charging cell which enhances hydrogen absorption by retarding the
recombination of hydrogen atoms on
...
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