1、December 2010 Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 25.220.20!$lb“1735963www.din.deDDIN EN ISO 2376Anodizing of aluminium and its alloys Determination of electric breakdown potential (ISO 2376:2010)English translation of DIN EN ISO 2376:2010-12Anodisieren von Aluminium und Aluminiumlegierungen Bestimmung der elektrischen Durchschlagspannung (ISO 23
3、76:2010)Englische bersetzung von DIN EN ISO 2376:2010-12Anodisation de laluminium et de ses alliages Dtermination de la tension lectrique de claquage (ISO 2376:2010)Traduction anglaise de DIN EN ISO 2376:2010-12SupersedesDIN EN 12373-17:2001-10www.beuth.deDocument comprises pagesIn case of doubt, th
4、e German-language original shall be considered authoritative.1012.10 DIN EN ISO 2376:2010-12 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee ISO/TC 79 “Light metals and their alloys”, Subcommittee SC 2/WG 16 “Revisions for systematic
5、reviewed TC 79/SC 2 ISO standards” (Secretariat: JISC, Japan) in collaboration with Technical Committee CEN/TC 132 “Aluminium and aluminium alloys”, Working Group WG 15 “Aluminium anodisation” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was the Normena
6、usschuss Nichteisenmetalle (Nonferrous Metals Standards Committee), Working Committee NA 066-01-09 AA Anodisch oxidiertes Aluminium. Amendments This standard differs from DIN EN 12373-17:2001-10 as follows: a) the standard has been taken over as DIN EN ISO 2376:2010-12 (the main title has been adapt
7、ed), see National Annex NA; b) in Subclause 3.1, a 60 Hz source as been included as an alternative for the power supply; c) the standard has been editorially revised. Previous editions DIN EN 12373-17: 2001-10 DIN EN ISO 2376:2010-12 3 National Annex NA (informative) Correspondence between the previ
8、ous standards series DIN EN 12373 “Aluminium and aluminium alloys Anodizing” and the corresponding new ISO and DIN EN ISO Standards Table NA.1 Correspondence previous now DIN EN 12373 DIN EN ISO Part 1 7599 General specifications for anodic oxidation coatings on aluminium The title has been slightly
9、 changed Part 2 2106 Determination of mass per unit area (surface density) of anodic oxidation coatings Gravimetric method Part 3 2 Determination of thickness of anodic oxidation coatings Non-destructive measurement by split-beam microscope Part 4 2143 Estimation of loss of absorptive power of anodi
10、c oxidation coatings after sealing Dye spot test with prior acid treatment Part 5 2931 Assessment of quality of sealed anodic oxidation coatings by measurement of admittance Part 6 Part 7 3210 Assessment of quality of sealed anodic oxidation coatings by measurement of the loss of mass after immersio
11、n in phosphoric acid/chromic acid solution The title has been changed: with/without prior acid treatment Part 8 Determination of the comparative fastness to ultra-violet light and heat of coloured anodic oxidation coatings Part 9 Part 10 8251 Measurement of abrasion resistance of anodic oxidation co
12、atings The title has been changed Part 11 7668 Measurement of specular reflectance and specular gloss of anodic oxidation coating at angles of 20 degrees, 45 degrees, 60 degrees or 85 degrees Part 12 6719 Measurement of reflectance characteristics of aluminium surfaces using integrating-sphere instr
13、uments Part 13 7759 Measurement of reflectance characteristics of aluminium surface using a goniophotometer or an abridged goniophotometer The German title has been slightly changed Part 14 10215 Visual determination of image clarity of anodic oxidation coatings Chart scale method Part 15 3211 Asses
14、sment of resistance of anodic oxidation coatings to cracking by deformation Part 16 2085 Check for continuity of thin anodic oxidation coatings Copper sulphate test Part 17 2376 Determination of electric breakdown potential Part 18 8993 Rating system for the evaluation of pitting corrosion Chart met
15、hod Part 19 8994 Rating system for the evaluation of pitting corrosion Grid method Anodizing of aluminium and its alloys 1286581DIN EN ISO 2376:2010-12 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2376 August 2010 ICS 25.220.20 Supersedes EN 12373-17:20
16、01English Version 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
17、elektrischen 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 altera
18、tion. Up-to-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 trans
19、lation under 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, Franc
20、e, Germany, 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
21、NORMUNG Management 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: EContents DIN EN ISO 2376:2010-12 EN ISO 2376:2010 (E) Page Foreword3 1 Scope 4 2 Principle4 3 Apparat
22、us .4 4 Procedure .5 4.1 Test specimen5 4.2 Determination.5 5 Expression of results 6 6 Test report 6 2 Foreword This document (EN ISO 2376:2010) has been prepared by Technical Committee ISO/TC 79 Light metals and their alloys” in collaboration with Technical Committee CEN/TC 132 “Aluminium and alum
23、inium alloys” the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2011, and conflicting national standards shall be withdrawn at the latest by Febru
24、ary 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12373-17:2001. According to the CEN/CENELEC Inte
25、rnal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem
26、bourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 2376:2010 has been approved by CEN as a EN ISO 2376:2010 without any modification. “ DIN EN ISO 2376:2010-12 EN ISO 2376:2010 (E) 3
27、1 Scope This International Standard specifies test methods for the determination of the electric breakdown potential of anodic oxidation 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 el
28、ectrical insulators. The methods are not applicable to coatings in the vicinity of cut edges, the edges of holes, or sharp changes of angle on, for example, extruded shapes. NOTE 1 The methods described do not give satisfactory results for unsealed coatings. NOTE 2 Electric breakdown potential is af
29、fected by relative humidity. 2 Principle The electric voltage at which current first passes through an anodic oxidation coating is measured; this breakdown potential is a function of the dielectric characteristics and the insulation properties of the oxidation coatings. The breakdown potential depen
30、ds upon the thickness of the coating, as well as on many other factors, particularly the composition of the basis metal, its surface condition, 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 T
31、ransformer (a.c.), having an output with a waveform as nearly sinusoidal as possible, capable of producing the potential required. 3.3 Voltage regulator, enabling the test potential to be increased gradually from any point without interruption, and providing an essentially undistorted waveform so th
32、at 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 resistor, 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, exp
33、ressed in volts. 3.6 Electrode probe, made from conducting material, suitably insulated for handling purposes, free to move as required 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 des
34、ign of the probe shall be such that, when the spherical surface is placed on the surface of the anodized test specimen, the total force exerted on the coating is 0,5 N to 1,0 N (a probe of mass 50 g to 100 g is suitable). DIN EN ISO 2376:2010-12 EN ISO 2376:2010 (E) 4 3.7 Contact plate, for testing
35、flat test specimens, having a smooth, bright, metallic surface, or a contact probe or clip which is capable of breaking 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
36、to rotate. The jaws shall be mounted so as to prevent lateral movement of the jaws when the twisting operation is carried 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 r
37、equired, shaped to correspond to its ultimate use in service. Unsealed items may be tested but only under conditions 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 l
38、ead to erroneous results. 4.2 Determination 4.2.1 Flat or near-flat surfaces 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. Place the test specimen on the contact plate (3.7)
39、in good electrical contact with it, for example by using an earthing clip. Alternatively, make contact to the basis 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 transfor
40、mer (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 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 br
41、eakdown of the coating). It is necessary to clean the contact surface of the probe after any breakdown has occurred, 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
42、and the mean value obtained. Alternatively, ascertain whether or not any value falls below a predetermined electric 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
43、the test is taking place. Twist together two suitable lengths of wire using the twisting machine (3.8) so that the number 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 ja
44、ws. Remove the wires from the twisting machine, separate the wires for about 50 mm at each end, and remove the anodic coating from one pair of ends. Join the opposite poles of the secondary winding of the transformer to these exposed ends. DIN EN ISO 2376:2010-12 EN ISO 2376:2010 (E) 5 Table 1 Numbe
45、r of twists for round wire test specimens Diameter of wire, d mm Number of twists per 50 mm 0,2 u 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
46、 reached or the potential drops suddenly (indicating electric breakdown of the coating). It is essential 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
47、 the mean value obtained. Alternatively ascertain whether or not any value falls below a predetermined 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 includ
48、e at least the following information: a) a reference to this International Standard; b) the type 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 electri
49、c breakdown potential conformed to that specified for the product; NOTE The minimum acceptable breakdown 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 date of the test. DIN EN ISO 2376:2010-12 EN ISO 2376:2010 (E) 6
