ISO INTERNATIONAL STANDARD 4212 First edition 2023-02 Corrosion of metals and alloys Method of oxalic acid etching test for intergranular corrosion of austenitic stainless steel Corrosion des métaux et alliages Méthode d'essai de gravure a I'acide oxalique pour la corrosion intergranulaire de I'acier inoxydableaustenitique Reference number IS0 4212:2023(E) osi @ ISO 2023 IS0 4212:2023(E) COPYRIGHT PROTECTED DOCUMENT @IS02023 All rights reserved. Unless otherwise specified, or required in the context of its 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 or ISo's member body in the country of the requester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2023 - All rights reserved