BS ISO 17474:2012 BSl Standards Publication Corrosion of metals and alloys - Conventions applicable to electrochemical measurements in corrosion testing bsi. ..making excellence a habit. BRITISH STANDARD BS ISO 17474:2012 National foreword This British Standard is the UK implementation of ISo17474:2012 The UK participation in its preparation was entrusted to Technical Committee ISE/NFE/8, Corrosion of metals and alloys. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. @ The British Standards Institution 2012. Published by BSI Standards Limited 2012 ISBN9780580702464 ICS 77.060 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29February2012. Amendments issued since publication Date Textaffected BS ISO 17474:2012 INTERNATIONAL ISO STANDARD 17474 First edition 2012-02-01 Corrosion of metals and alloys Conventions applicable to electrochemical measurements in corrosion testing Corrosiondesmetaux etalliages-Conventionsapplicables aux mesuresélectrochimiqueslorsdesessaisdecorrosion Reference number ISO 17474:2012(E) @ ISO 2012 BS ISO 17474:2012 ISO17474:2012(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2012 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or IsO's member body in the country of the requester. ISO copyright office Case postale 56.CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2012-All rights reserved BSISO17474:2012 ISO 17474:2012(E) Contents Page Foreword .iv Introduction 1 Scope. 2 Normative references 3 Terms and definitions.. 4 Significance and use.. 5 Sign conventionforelectrodepotential... 6 Sign conventionforcurrentand currentdensity... 7 Conventions for displaying polarization data .. 7.1 Sign conventions. 7.2 Current density-potential plots. 7.3 Potential referencepoint 7.4 Units... 7.5 Samplepolarization curves. 8 Conventionsfordisplayingelectrochemical impedancedata 8.1 8.2 The Nyquist format (complex plane)... 8.3 The Bode format... .10 Annex A(informative)References electrodes and theirtemperaturedependence. .12 Bibliography 13 @ ISO 2012 All rights reserved ili BS ISO.17474:2012 ISO17474:2012(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 non-governmental, in liaison with IsO, also take part in the work. iso collaborates closely with the InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. 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. iv ISO 2012-All rights reserved BS ISO 17474:2012 ISO17474:2012(E) Introduction Electrochemical test methods are useful for studying corrosion, because it is one particular phenomena of electrochemical impedance, etc. This International Standard describes how these data are presented, being derived from basic methodology in ASTM G3-89[11]. ISO 2012All rights reserved V