1、 IEC 60426 Edition 2.0 2007-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulating materials Determination of electrolytic corrosion caused by insulating materials Test methods Matriaux isolants lectriques Dtermination de la corrosion lectrolytique en prsence de matriaux isolants Mthod
2、es dessais IEC 60426:2007 colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC, Geneva, Switzerland 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 photocop
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16、uestions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60426 Edition 2.0 2007-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulating materials Determination of electrolytic corrosion caused by insulating materials
17、 Test methods Matriaux isolants lectriques Dtermination de la corrosion lectrolytique en prsence de matriaux isolants Mthodes dessais INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 17.220.99; 29.035.01 PRICE CODE CODE PRIX ISBN 2-8318-1076-5 Registered tra
18、demark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale colour inside 2 60426 IEC:2007 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references .7 3 Terms and definitions .7 4 General description of the test method .8 5 Test sp
19、ecimens 8 5.1 General .8 5.2 Cut surfaces of rigid materials (blocks, plates, sheets or semi-finished materials) 9 5.3 Cast, moulding, injection and pressed materials9 5.4 Cut surfaces of flexible films, foils and thin sheets.9 5.5 Adhesive tapes10 5.6 Flexible sleeving and tubing 10 5.7 Lacquers an
20、d insulating varnishes.10 5.8 Cleanliness of contact surfaces .10 5.9 Number of test specimens .11 6 Test strips 11 6.1 General .11 6.2 Preparation of the test strips .11 6.3 Cleanliness of test strips .12 7 Test device.12 8 Test conditions.14 9 Test procedure .14 10 Evaluation 14 10.1 General evalu
21、ation 14 10.2 Visual inspection of the test strips .15 10.3 Tensile strength of test strips 15 11 Evaluation of corrosion on copper strips .16 12 Test report17 Annex A (normative) Tables for the evaluation of corrosion on brass and aluminium strips 18 Annex B (informative) Notes on visual evaluation
22、 20 Annex C (informative) Copper wire tensile strength method .21 Figure 1 Test specimen of rigid material, for example textile laminate8 Figure 2 Test specimen of flexible material, for example flexible films, foils etc10 Figure 3 Test strip12 Figure 4 Test device for determining electrolytic corro
23、sion.13 Figure C.1 Apparatus for determining electrolytic corrosion of rigid insulating material 23 Figure C.2 Apparatus for determining electrolytic corrosion of flexible insulating material 23 60426 IEC:2007 3 Table 1 Degrees of corrosion of copper strips16 Table A.1 Degrees of corrosion of brass
24、strips.18 Table A.2 Degrees of corrosion of aluminium strips .19 4 60426 IEC:2007 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL INSULATING MATERIALS DETERMINATION OF ELECTROLYTIC CORROSION CAUSED BY INSULATING MATERIALS TEST METHODS FOREWORD 1) The International Electrotechnical Commission
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35、 be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60426 has been prepared by IEC technical committee 112: Evaluation and qualification of electrical insulating materials and systems. This second edition cance
36、ls and replaces the first edition, published in 1973, and constitutes a technical revision. The main changes with respect to the previous edition are listed below: experience has indicated the need for improved description of the experimental method. It describes a revised procedure for the visual a
37、nd tensile strength test method that overcomes the limitations of the first edition; one older method of the first edition has partly been maintained in the informative annex. 60426 IEC:2007 5 This bilingual version, published in 2010-01, corresponds to the English version. The text of this standard
38、 is based on the following documents: FDIS Report on voting 112/45/FDIS 112/55/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. The French version of this standard has not been voted upon. This publication has bee
39、n drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch” in the data related to the specific publication. At this da
40、te, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should there
41、fore print this document using a colour printer. 6 60426 IEC:2007 INTRODUCTION Electrical insulating materials at high atmospheric humidity and under influence of electric stress may cause corrosion of metal parts being in contact with them. Such electrolytic corrosion is dependent upon the composit
42、ion of the insulating material and the character of the metal; it is influenced by temperature, relative humidity, nature of the voltage and the time of exposure. Direct voltage produces much more rapid and extensive corrosion than alterna- ting voltage. Corrosion is more pronounced at the positive
43、electrode. Not only copper but also most other metals, except the noble metals such as platinum or gold, are subject to electrolytic corrosion. Electrolytic corrosion, however, is usually determined with insulating materials in contact with copper, brass or aluminium. Copper, however, is a basic met
44、al and most frequently used in electrotechnical, teletechnical and electronic equipment, especially for current conducting parts and therefore it was chosen as a basic test metal. Other metals may be used when needed for special purposes, but the results may differ from those described in this metho
45、d. Electrolytic corrosion may cause open-circuit failure in electrical conductors and devices. It may promote low resistance leakage path across or through electrical insulation and the products of corrosion may otherwise interfere with the operation of electrical devices, i.e. may prevent operation
46、 of contacts, etc. Electronic equipment operating under conditions of high humidity and elevated temperature may be particularly subjected to failure from electrolytic corrosion. Therefore, the selection of insulating materials, which do not produce electrolytic corrosion, is important for such appl
47、ications. The test method described in this second edition replaces two separate methods of the first edition visual and tensile strength method. The former tensile strength method of the first edition, using copper wires, has been maintained in an informative annex. It must be emphasized that the a
48、dvantage of this new method is that the same strip used for visual inspection is next used for the tensile strength test in opposite to the method described in the first edition. Therefore the correlation between tensile strength and visual examination is more obvious. 60426 IEC:2007 7 ELECTRICAL IN
49、SULATING MATERIALS DETERMINATION OF ELECTROLYTIC CORROSION CAUSED BY INSULATING MATERIALS TEST METHODS 1 Scope This standard determines the ability of insulating materials to produce electrolytic corrosion on metals being in contact with them under the influence of electric stress, high humidity and elevated temperature. The effect of electrolytic corrosion is assessed in one
