ISO INTERNATIONAL STANDARD 19280 First edition 2017-08 Corrosion of metals and alloys Measurement of critical crevice temperature for cylindrical crevice geometries in ferric chloride solution Corrosion des meétaux et alliages - Mesure de la température critique de corrosion caverneuse de crevasses de géométries cylindriques dans une solution de chlorure ferrique Reference number IS0 19280:2017(E) rso @ IS0 2017 IS0 19280:2017(E) COPYRIGHT PROTECTED DOCUMENT @ IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form writtenpermission.Permission canberequestedfromeitherIsOattheaddressbelow orIso'smemberbodyinthecountryof the requester. ISO copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ii @ IS0 2017 - All rights reserved IS0 19280:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions ..1 4 General principles. ..1 4.1 Objective. .1 4.2 Immersion test. .2 4.2.1 General. .2 4.2.2 CCT measurements in single test cell .2 4.2.3 CCT measurements in multiple test cells. 2 4.3 Criterion for CCT. 2 5 Apparatus .2 5.1 Crevice former assembly 2 5.2 Test cell. .6 5.2.1 General .6 5.2.2 Flask requirements. ..6 5.2.3 Condenser. .7 5.3 Test temperature. .7 5.4 Crevice assembly 5.4.1 Supporting deck blocks and crevice formers .7 5.4.2 Reuse of crevice assemblies 10 5.4.3 Bolt and washer. .10 5.5 Required apparatus 10 6 Test solutions ..10 7 Test specimen. ..10 7.1 Specimen size ..10 7.2 Surface finish 11 8 Experimental procedure ..11 9 Examination and evaluation ..12 9.1 Examination. ..12 9.2 Evaluation. ..12 9.3 Estimation of CCT .12 10 Test report ..12 Bibliography .14 IS0 2017 - All rights reserved iii