EN ISO 2376-2010 en Anodizing of aluminium and its alloys - Determination of electric breakdown potential《铝和铝合金的阳极氧化 绝缘击穿电压的测定》.pdf

《EN ISO 2376-2010 en Anodizing of aluminium and its alloys - Determination of electric breakdown potential《铝和铝合金的阳极氧化 绝缘击穿电压的测定》.pdf》由会员分享，可在线阅读，更多相关《EN ISO 2376-2010 en Anodizing of aluminium and its alloys - Determination of electric breakdown potential《铝和铝合金的阳极氧化 绝缘击穿电压的测定》.pdf（10页珍藏版）》请在麦多课文档分享上搜索。

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 2376:2010Anodizing of aluminium andits alloys Determination ofelectric breakdown potential(ISO 2376:2010)BS EN ISO 2376:2010 BRITISH STANDARDNational forewordThis Briti

2、sh Standard is the UK implementation of EN ISO 2376:2010.It supersedes BS EN 12373-17:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/32, Anodic oxidation coatings on aluminium.A list of organizations represented on this committee can beobtaine

3、d on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 66004 7ICS 25.220.20; 77.120.10Compliance with a British Standard cannot confer immunity fromlegal obligation

4、s.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 October 2010.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2376 August 2010 ICS 25.220.20 Supersedes EN 12373-17:2001English V

5、ersion Anodizing of aluminium and its alloys - Determination of electric breakdown potential (ISO 2376:2010) Anodisation de laluminium et de ses alliages - Dtermination de la tension lectrique de claquage (ISO 2376:2010) Anodisieren von Aluminium und Aluminiumlegierungen - Bestimmung der elektrische

6、n Durchschlagspannung (ISO 2376:2010) This European Standard was approved by CEN on 14 July 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to

7、-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation unde

8、r the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany,

9、 Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Man

10、agement Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2376:2010: EBS EN ISO 2376:2010ISO 2376:2010(E) ISO 2010 All rights reserved iiiForeword ISO (the International Organization

11、 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

12、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. Intern

13、ational Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publicati

14、on as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent right

15、s. ISO 2376 was prepared by Technical Committee ISO/TC 79, Light metals and their alloys, Subcommittee SC 2, Organic and anodic oxidation coatings on aluminium. This second edition cancels and replaces the first edition (ISO 2376:1972), which has been technically revised. BS EN ISO 2376:2010BS EN IS

16、O 2376:2010INTERNATIONAL STANDARD ISO 2376:2010(E) ISO 2010 All rights reserved 1Anodizing of aluminium and its alloys Determination of electric breakdown potential 1 Scope This International Standard specifies test methods for the determination of the electric breakdown potential of anodic oxidatio

17、n coatings on aluminium and its alloys, on flat or near-flat surfaces and on round wire. The methods are applicable to anodic oxidation coatings used primarily as electrical insulators. The methods are not applicable to coatings in the vicinity of cut edges, the edges of holes, or sharp changes of a

18、ngle on, for example, extruded shapes. NOTE 1 The methods described do not give satisfactory results for unsealed coatings. NOTE 2 Electric breakdown potential is affected by relative humidity. 2 Principle The electric voltage at which current first passes through an anodic oxidation coating is meas

19、ured; this breakdown potential is a function of the dielectric characteristics and the insulation properties of the oxidation coatings. The breakdown potential depends upon the thickness of the coating, as well as on many other factors, particularly the composition of the basis metal, its surface co

20、ndition, the effectiveness of sealing, the dryness of the sample and the degree of ageing. 3 Apparatus 3.1 Power supply, from a suitable 50 Hz or 60 Hz source. 3.2 Transformer (a.c.), having an output with a waveform as nearly sinusoidal as possible, capable of producing the potential required. 3.3

21、Voltage regulator, enabling the test potential to be increased gradually from any point without interruption, and providing an essentially undistorted waveform so that the peak potential is within the limit 2 5 % (i.e. 1,34 to 1,48) of the root-mean-square (r.m.s.) potential. 3.4 Current limiting re

22、sistor, 0,5 M, in series with secondary winding of the transformer and the test electrode probe (3.6). 3.5 Potential-measuring device, which gives r.m.s. values, expressed in volts. 3.6 Electrode probe, made from conducting material, suitably insulated for handling purposes, free to move as required

23、 and adequately supported. The contact surface shall be spherical with a diameter of 3 mm to 8 mm and shall be maintained in a smooth, untarnished condition. The design of the probe shall be such that, when the spherical surface is placed on the surface of the anodized test specimen, the total force

24、 exerted on the coating is 0,5 N to 1,0 N (a probe of mass 50 g to 100 g is suitable). BS EN ISO 2376:2010ISO 2376:2010(E) 2 ISO 2010 All rights reserved3.7 Contact plate, for testing flat test specimens, having a smooth, bright, metallic surface, or a contact probe or clip which is capable of break

25、ing through to the basis metal (see 4.2.1). 3.8 Twisting machine, for testing round wire, having two sets of jaws 400 mm apart, with one set of jaws fixed, while the other set is free to rotate. The jaws shall be mounted so as to prevent lateral movement of the jaws when the twisting operation is ca

26、rried out (see 4.2.2). 4 Procedure 4.1 Test specimen The test specimen shall normally consist of a production component (or a part thereof). It shall be sealed, dry and clean and, if required, shaped to correspond to its ultimate use in service. Unsealed items may be tested but only under conditions

27、 of known, recorded and controlled relative humidity. NOTE The use of specially prepared test specimens, processed at the same time and in the same manner as production articles, can lead to erroneous results. 4.2 Determination 4.2.1 Flat or near-flat surfaces Unless otherwise specified, carry out t

28、he determination at room temperature. Measure and record the relative humidity of the environment in which the test is taking place. Place the test specimen on the contact plate (3.7) in good electrical contact with it, for example by using an earthing clip. Alternatively, make contact to the basis

29、metal using the contact probe or clip. Connect the contact plate or contact probe or clip (3.7) and the electrode probe (3.6) to opposite poles of the secondary winding of the transformer (3.2), and place the probe on the test specimen so that the force exerted on the coating is 0,5 N to 1,0 N (see

30、3.6). Starting at zero, increase the potential uniformly at a rate not exceeding 25 V/s until the specified potential is reached or the potential drops suddenly (indicating electric breakdown of the coating). It is necessary to clean the contact surface of the probe after any breakdown has occurred,

31、 and it is essential to return the potential to zero after each determination and particularly before cleaning the probe. Carry out a minimum of five tests and record the lowest value and the mean value obtained. Alternatively, ascertain whether or not any value falls below a predetermined electric

32、breakdown potential. 4.2.2 Round wire Unless otherwise specified, carry out the determination at room temperature. Measure and record the relative humidity of the environment in which the test is taking place. Twist together two suitable lengths of wire using the twisting machine (3.8) so that the n

33、umber of twists per 50 mm specified in Table 1 is achieved. Ensure that the two lengths of wire are of equal length between the jaws, are under equal tension and are touching in the jaws. Remove the wires from the twisting machine, separate the wires for about 50 mm at each end, and remove the anodi

34、c coating from one pair of ends. Join the opposite poles of the secondary winding of the transformer to these exposed ends. BS EN ISO 2376:2010ISO 2376:2010(E) ISO 2010 All rights reserved 3Table 1 Number of twists for round wire test specimens Diameter of wire, d mm Number of twists per 50 mm 0,2 u

35、 d u 0,3 0,3 d u 0,5 0,5 d u 0,75 0,75 d u 1,25 1,25 d u 3,25 3,25 d u 6,5 5 4 3 2 1 0,5 Starting at zero, increase the potential uniformly at a rate not exceeding 25 V/s until the specified potential is reached or the potential drops suddenly (indicating electric breakdown of the coating). It is es

36、sential to return the potential to zero after each determination, and to maintain the contacts between the transformer and test specimen. Carry out a minimum of five tests and record the lowest value and the mean value obtained. Alternatively ascertain whether or not any value falls below a predeter

37、mined electric breakdown potential. 5 Expression of results Express the electric breakdown potential, in volts, as the lowest value recorded and the mean value. 6 Test report The test report shall include at least the following information: a) a reference to this International Standard; b) the type

38、and identification of the product tested; c) the anodizing specification, when applicable; d) the electric breakdown potential (see Clause 5) and, where appropriate, a statement as to whether the electric breakdown potential conformed to that specified for the product; NOTE The minimum acceptable br

39、eakdown potential will normally be specified in the relevant product specification. e) the relative humidity of the environment at the time of the test; f) any other relevant information on the tests or the results, including the test temperature, if it is different from room temperature; g) the dat

40、e of the test. This page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-related publications, information and services. It presents the UK view on standards in Europe and at the international level. It is incorporated by Roy

41、al Charter.British Standards Institution (BSI)raising standards worldwideBSI Group Headquarters389 Chiswick High Road London W4 4AL UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 Standards are updated by amendment or revision. Users of British Stan-dards should make sure that they possess the latest a

42、mendments or editions.It is the constant aim of BSI to improve the quality of our products and serv-ices. We would be grateful if anyone finding an inaccuracy or ambiguity whileusing this British Standard would inform the Secretary of the technical com-mittee responsible, the identity of which can b

43、e found on the inside frontcover.Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001BSI offers Members an individual updating service called PLUS which ensuresthat subscribers automatically receive the latest editions of standards.Tel: +44 (0)20 8996 7669 Fax: +44 (0)20 8996 7001Email: Buying standard

44、sYou may buy PDF and hard copy versions of standards directly using acredit card from the BSI Shop on the website addition all orders for BSI, international and foreign standards publicationscan be addressed to BSI Customer Services.Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001Email: In respons

45、e to orders for international standards, it is BSI policy tosupply the BSI implementation of those that have been publishedas British Standards, unless otherwise requested.Information on standardsBSI provides a wide range of information on national, Europeanand international standards through its Kn

46、owledge Centre.Tel: +44 (0)20 8996 7004 Fax: +44 (0)20 8996 7005Email: Various BSI electronic information services are also available whichgive details on all its products and services. Tel: +44 (0)20 8996 7111 Fax: +44 (0)20 8996 7048Email: BSI Subscribing Members are kept up to date with standards

47、developments and receive substantial discounts on the purchase priceof standards. For details of these and other benefits contact Membership Ad-ministration. Tel: +44 (0)20 8996 7002 Fax: +44 (0)20 8996 7001 Email: Information regarding online access to British Standards via BritishStandards Online

48、 can be found at information about BSI is available on the BSI website at www.bsi- subsists in all BSI publications. BSI also holds the copyright,in the UK, of the publications of the international standardization bodies. Ex-cept as permitted under the Copyright, Designs and Patents Act 1988 no ex-

49、tract may be reproduced, stored in a retrieval system or transmitted in anyform or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the freeuse, in the course of implementing the standard of necessary details such assymbols, and size, type o