ISO INTERNATIONAL STANDARD 18089 Firstedition 2015-11-01 Corrosion of metals and alloys Determination of the critical crevice temperature (CCT) for stainless steels under potentiostatic control CorrosiondesmetauxetalliagesDeterminationdelatemperature critique de corrosion caverneuse (TCCC)desaciers inoxydables sous controlepotentiostatique Referencenumber IS018089:2015(E) LSO Intermational Organization for Standardization @IS02015 ed without license from IHS IS0 18089:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS02015,Published inSwitzerland All rights reserved. Unless otherwise specified, 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 Ch. de Blandonnet 8. CP 401 CH-1214 Vernier,Geneva, Switzerland Tel. +41 22 749 01 11 Fax +4122 749 09 47 [email protected] www.iso.org Intemationaibr PrganizationforStandardization Uicensee-ZHEJIANG INST OF STANDARDIZAoISQ,5-All rights reserved etworking permitted without license from IHS Not for Resale, 2016/1/8 02:02:23 IS0 18089:2015(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions .1 4 Principle ..2 5 Equipment. .2 6 Procedure .3 6.1 Preparationofreferenceelectrodes .3 6.2 Preparation of specimen .3 6.3 Preparation of solution .4 6.4 Setting up the test. .4 6.5 Ending test .5 7 Assessment of results .5 8 Test report. .5 Annex A (informative) Examples of howthe connections of the electrode can be made AnnexB(normative)Schematicrepresentation ofdifferentcreviceformersused forccT-measurements .8 Annex C (normative)Calibration of specimen temperaturevs.solution temperature ifa specimen holder is used 11 AnnexD (informative)Potentialdifferenceofselectedreferenceelectrodesat25Cwith respecttothe standard hydrogen electrode (SHE) .12 Bibliography .13 iii Dut license from IHS