ISO INTERNATIONAL STANDARD 4623-1 Second edition 2018-10 Paints and varnishes Determination ofresistanceto filiform corrosion: Part 1: Steel substrates Peintures et vernis-Determination de la résistance a la corrosion filiforme- Partie1:Subjectiles enacier Reference number ISO 4623-1:2018(E) ISO IS02018 IS0 4623-1:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2018 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 ontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherIsoattheaddress beloworIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 : Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @IS02018-Allrightsreserved IS0 4623-1:2018(E) Contents Page Foreword .iv Introduction. .. 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions 4 Principle .2 5 Limitations. .2 6 Sampling. .2 7 Apparatus. .2 8 Reagents. .2 9 Test panels .2 9.1 Material and dimensions .2 9.2 Preparation and coating. .2 9.3 Drying and conditioning .3 9.4 Thickness of coating .3 10 Procedure .3 10.1 Number of determinations .3 10.2 Scribingthetestpanels. 3 10.3 Testing. .4 10.3.1 General 4 10.3.2 Dippingtechnique .4 10.3.3 Salt fog technique .4 10.4 Inspection oftestpanels .5 11 Evaluation ofthedegree offiliform corrosion .5 12 Precision .5 13 Testreport .6 Annex A (informative) Guidance notes on maintaining exposure conditions using saturated ammonium sulfate solution 7 Bibliography .8 @IS0 2018 -All rights reserved ili