ISO INTERNATIONAL STANDARD 23449 First edition 2020-10 Corrosion of metals and alloys Multielectrode arrays for corrosion measurement Corrosion des metaux etalliages -Assemblages multi-électrodes pour la mesure dela corrosion Reference number ISO 23449:2020(E) @ISO 2020 ISO 23449:2020(E) COPYRIGHTPROTECTED DOCUMENT OISO2020 All rights reserved.Unless otherwisespecified,or required inthe context ofits implementation,no part of this publication may be reproduced or utilized otherwise in any form or by any means,electronic or mechanical,including photocopying,or posting on the internet or an intranet,without prior written permission.Permission can be requested from either ISo at the address below or ISO's member body in the country of the requester. ISO copyright office CP 40i-Ch.de Blandonnet 8 CH-1214 Vermier,Geneva Phone:+41227490111 Email:copyright@iso.org Website:www.iso.org Published in Switzerland ii OISO 2020-All rights reserved 23449:2020(E) ISO Contents Page Foreword Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 4.1 Multielectrode arrays 4.2 Coupled multielectrodearray (CMA) 4.3 Multielectrode array with closely packed electrodes for studying spatiotemporal behaviouroflocalizedcorros.ion. 4.4 Coupled multielectrode array sensor (CMAS) . 4.4.1 CMASfor corrosion monitoring . 4.4.2 CMASused without polarization to measure corrosion rate at free corrosionpotential 4.4.3 CMASused toevaluate the effectiveness ofcathodic protection and the effect of stray current 4.5 Multielectrode arrays for high throughput measurements 4.6 Multielectrode arrays for other applications ... Instrumentation 5 5.1 Potential measurement 5.2 Couplingcurrentmeasurement 5.3 Effective coupling ofindividual electrodes 5.3.1 Coupling with multichannel ZVA. 5.3.2 Coupling with wires and measuring current with a single ZVA 0 6 Fabrication of multielectrode array 10 6.1 Electrode preparation 10 6.2 Number ofelectrodes 10 6.3 Mounting ofelectrodes .. 6.4 Surface coating on electrodes for preventing crevice corrosion 6.5 Electrode configuration ...... 6.6 Size ofelectrodes 6.3 6.9 Size and spacing of the electrodes for high throughput studies 7 Test procedure 8 Test report Annex A (informative) Typical results from multielectrode array with closely packed electrodes for studying spatiotemporal behaviour oflocalized corrosion Annex B(informative) Typical results from a CMASfor corrosion monitoring 15 AnnexC(informative)Examplereports Bibliography .. 18 @ ISO 2020-All rights reserved ili