ISO INTERNATIONAL STANDARD 7539-1 Secondedition 2012-12-15 Corrosion of metals and alloys Stress corrosion testing - Part 1: General guidance on testing procedures Corrosion des métaux et alliages - Essais de corrosion sous contrainte Partie 1: Lignes directrices generales relatives aux methodes d'essai Reference number IS0 7539-1:2012(E) LSO @ IS0 2012 I without license from IHS Not for Resale IS0 7539-1:2012(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 addressbeloworIso'smemberbodyinthecountryoftherequester. ISO copyright office Case postale 56:CH-1211 Geneva 20 Tel.+41227490111 Fax +41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2012 - All rights reserved No reproduction networking permited without license from IHS Not for Resale IS0 7539-1:2012(E) Contents Page Foreword ..iv 1 Scope .1 2 Terms and definitions 3 Background. 4 Selection of test method 5 Stressing systems. ..4 5.1 General .4 5.2 Constant total strain tests ..4 5.3 Constant load tests ..5 5.4 Slow strain rate tests ..6 6 Environmental aspects. 6.1 General .7 6.2 Temperature .1 6.3 Water chemistry 7 6.4 Flow rate.. .9 6.5 Electrochemical aspects .9 Time dependent issues. .10 7.1 General .10 7.2 Pitting and intergranular corrosion .10 7.3 Hydrogen uptake. .10 8 Specimen design and manufacture. .11 8.1 General 11 8.2 Surface condition 11 8.3 Areaeffects .13 8.4 Pre-cracked test pieces .13 8.5 Welds. ..14 9 Stress corrosion test cells. .14 10 Initiation of stress corrosion tests ..15 11 Assessment and treatment of results ..15 Annex A (informative) Guide to selection of mechanical test method ..18 Bibliography .20 iii ded by IHS under lic ense with ISt ed without license from IHS Not for Resale