ISO INTERNATIONAL 20728 STANDARD First edition 2018-09 Corrosion of metal and alloys Determination of resistance of magnesium alloys to stress corrosion cracking Corrosion des métaux et alliages - Détermination de la résistance des alliages de magnesium a la fissuration par corrosion sous contrainte Reference number IS0 20728:2018(E) ISO @ IS0 2018 IS0 20728:2018(E) COPYRIGHTPROTECTEDDOCUMENT @IS02018 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 beloworIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Fax: +4122 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii IS02018-Allrights reserved IS0 20728:2018(E) Contents Page Foreword iv 1 Scope 1 2 Normative references .1 3 Terms and definitions .1 4 General principles. .2 5 Apparatus and materials .2 5.1 Loading apparatus. 5.2 Construction materials for the test set-up 5.3 2 Specimen holders. 5.4 Apparatus for alternate immersion in solutions Sampling. 6 3 7 Specimens. 5 7.1 Type and sizes 55 7.2 Surface preparation 7.3 Specimen identification 6 7.4 Precautions 6 8 Test environments 6 Loading. 9 7 10 Procedure. 7 11 Assessment of results .8 12 Expression of results 13 Test report. .9 Annex A (informative) Assessment of grain size and orientation. .11 Bibliography .12 IS0 2018-All rights reserved iii