ISO INTERNATIONAL STANDARD 14676 First edition 1997-07-15 Adhesives Evaluation of the effectiveness of surface treatment techniques for aluminium - Wet-peel test by floating-roller method AdhesifsEvaluationde I'efficacitedestechniquesdetraitement de surface de I'aluminium - Essai de pelage humide par la methode des galetsmobiles ISO Referencenumber ISO 14676:1997(E) ISO 14676:1997(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 14676 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11, Products. It is similar, but not technically identical to, ENV 1967:1995. @ISO 1997 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 the publisher. InternationalOrganizationforStandardization Case postale 56 · CH-1211 Geneve 20 · Switzerland Internet [email protected] X.400 c=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii ?ISO ISO 14676:1997(E) Introduction This test has been developed to assess pretreatments for aluminium and is intended for laboratory evaluations. The object was to find and develop a rapid test possessing high sensitivity which could differentiate between pickling pretreatments: complete chromic acid anodisation (CAA)/phosphoric acid anodisation (PAA) processes and incomplete ones. The application of water containing a wetting agent changes the mode of failure from cohesive failure, usually found in dry joints, to quasi-adhesive failure. The latter is associated with a corresponding reduction in the complete CAA or PAA process. The failure mechanisms in the boundary layer zone initiated by this test are mainly explained by the diffusion of water. The wetting agent essentially improves the surface wetting. This test is considered to be unsuitable for long-term durability prediction. It is expected that if this severe test is applied to less stable joints it will cause mainly adhesive failure. As a consequence, the test loses its ability to differentiate effectively in such circumstances. However, the applicability to other materials and surface pretreatment methods has not been investigated in detail.