1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 6581:2010Anodizing of aluminium andits alloys Determinationof the comparative fastnessto ultraviolet light and heatof coloured anodic oxidationcoatings (ISO 6581:2010)B
2、S EN ISO 6581:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 6581:2010.It supersedes BS EN 12373-8:1999 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/32, Anodic oxidation coatings on aluminium.A list
3、 of organizations represented on this committee can beobtained 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 65998 0ICS 25.220.20; 77.120.10Compliance with a
4、 British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2010Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6581 Jul
5、y 2010 ICS 25.220.20 Supersedes EN 12373-8:1998English Version Anodizing of aluminium and its alloys - Determination of the comparative fastness to ultraviolet light and heat of coloured anodic oxidation coatings (ISO 6581:2010) Anodisation de laluminium et de ses alliages - Dtermination de la solid
6、it compare la lumire ultraviolette et la chaleur des couches anodiques colores (ISO 6581:2010) Anodisieren von Aluminium und Aluminiumlegierungen - Vergleichsbestimmung der Bestndigkeit von gefrbten, anodisch erzeugten Oxidschichten gegen ultraviolettes Licht und Wrme (ISO 6581:2010) This European S
7、tandard was approved by CEN on 23 June 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-date lists and bibliographical references concerning
8、 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 under the responsibility of a CEN member into its own lan
9、guage 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, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Li
10、thuania, 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 Management Centre: Avenue Marnix 17, B-1000 Brussels 201
11、0 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6581:2010: EBS EN ISO 6581:2010EN ISO 6581:2010 (E) 3 Foreword This document (EN ISO 6581:2010) has been prepared by Technical Committee ISO/TC 79 “Light metals and their alloys
12、“ in collaboration with Technical Committee CEN/TC 132 “Aluminium and aluminium 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 January 2011, and
13、 conflicting national standards shall be withdrawn at the latest by January 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
14、 document supersedes EN 12373-8:1998. According to the CEN/CENELEC Internal 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, Germ
15、any, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 6581:2010 has been approved by CEN as a EN ISO 6581:2010 with
16、out any modification. BS EN ISO 6581:2010ISO 6581:2010(E) ISO 2010 All rights reserved iiiForeword 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 ou
17、t 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 co
18、llaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International 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
19、Standards. 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. ISO 6581 was prepared by Technical Committee ISO/TC 79, Light
20、metals and their alloys, Subcommittee SC 2, Organic and anodic oxidation coatings on aluminium. This second edition cancels and replaces the first edition (ISO 6581:1980), which has been technically revised. BS EN ISO 6581:2010ISO 6581:2010(E) iv ISO 2010 All rights reservedIntroduction The test des
21、cribed in this International Standard represents severe exposure to ultraviolet light and, because of its severity, provides a very rapid determination of the comparative light-fastness of coloured anodic oxidation coatings. It has to be realized, however, that the light emitted by the mercury vapou
22、r source used in the test has a discontinuous spectrum and a high content of ultraviolet radiation. Care must therefore be taken in comparing the results of this test with the results of exposure to sunlight. Considerable heat is generated by the light source, and the test needs to be carried out in
23、 such a way that the temperature of the test pieces during the test does not exceed 100 C. BS EN ISO 6581:2010INTERNATIONAL STANDARD ISO 6581:2010(E) ISO 2010 All rights reserved 1Anodizing of aluminium and its alloys Determination of the comparative fastness to ultraviolet light and heat of coloure
24、d anodic oxidation coatings 1 Scope This International Standard specifies a comparative method for the determination of the fastness of coloured anodic oxidation coatings to ultraviolet (UV) light and heat. The method is not suitable for testing coloured anodic oxidation coatings that are heat sensi
25、tive. NOTE Dark-coloured test pieces will normally reach the highest temperatures. 2 Principle Test pieces are exposed to ultraviolet light and the colour changes taking place are observed and compared with standard or control specimens. 3 Apparatus 3.1 General The apparatus consists of a cabinet ma
26、de from suitable heat-resistant material with a source of ultraviolet light and an arrangement of specimen holders or supports placed at an equal distance from the light source. 3.2 Cabinet The cabinet shall be designed so that all exposed test pieces can be positioned at equal distances from the la
27、mp. NOTE A cylindrical cabinet with the lamp placed vertically in the centre, or a cabinet of rectangular cross-section with the lamp placed horizontally above a support on which the test pieces are placed, is suitable. Increasing the test temperature increases the rate of fading of the test pieces
28、and their surface temperature in the test cabinet shall not be allowed to exceed 100 C during any part of the test. In some cases, this will require the cabinet and test pieces to be cooled by means of a suitable fan. Care shall be taken to avoid over-cooling the lamp itself as this may affect the a
29、rc, and the lamp manufacturers advice on this aspect should be followed. WARNING The cabinet shall be totally enclosed or suitably baffled to eliminate any possibility of ultraviolet light escaping, since certain ultraviolet wavelengths can damage the eyes. A micro-switch shall be fitted to the open
30、ing part of the cabinet, such that the light source is automatically switched off when the cabinet is opened. Many ultraviolet light sources produce ozone under the conditions of testing (see 3.3) and this can also constitute a health hazard. If ozone is produced by the action of the lamp, it is des
31、irable to have BS EN ISO 6581:2010ISO 6581:2010(E) 2 ISO 2010 All rights reservedforced air circulation and it is essential that the air from the cabinet is ducted to a point outside the building. If in doubt, consult the manufacturer. 3.3 Ultraviolet light source The ultraviolet lamp shall be a med
32、ium-pressure mercury arc-lamp with a silica envelope, controlled by a suitable transformer and switch. The lamp shall not be glass shielded, as this would eliminate most of the ultraviolet light. The power of the lamp and its arc length shall be such that the approximate intensities shown in Table 1
33、 are recorded at a distance of 190 mm from its centre. Table 1 Approximate UV light intensities at 190 mm from the centre of the lamp Wavelength nm Intensity W/cm2254 500 to 150 265 800 to 400 297 600 to 400 303 1 000 to 800 313 1 350 to 1 200 365 1 500 to 1 700 405 800 to 1 000 436 1 300 to 1 600 N
34、OTE A convenient arrangement has been found to be a 500 W lamp with an effective arc length of 120 mm, placed at a distance of approximately 190 mm from the specimens. Most lamps have a recommended life of about 1 000 h and during use there will be a decrease in output, especially at wavelengths bel
35、ow 313 nm. It is therefore desirable to use an intensity regulator for the lamp, which will compensate, to some extent, for this decrease. Care should be taken to avoid handling the silica envelope of the lamp as this can cause it to devitrify. Although ozone has little effect on the test results, i
36、t is desirable that the lamp used does not produce ozone, as this avoids the necessity for ducting the air outside. 3.4 Specimen arrangement The apparatus shall be arranged so that specimens can be placed in suitable holders or on a suitable support and are equidistant from the light source. Care sh
37、all be taken to ensure that the specimens are not shielded from the light source, by the supporting column for the lamp or by glass. 4 Procedure 4.1 General Expose the specimens to ultraviolet light in the cabinet (see 3.2) until the colour change on either the test piece or the control specimen rea
38、ches a predetermined level, as agreed between the customer and the anodizer. BS EN ISO 6581:2010ISO 6581:2010(E) ISO 2010 All rights reserved 3NOTE The time of exposure required depends upon the apparatus used and the coloured anodized finish being assessed. This test is severe by comparison with ot
39、her light-fastness tests, and most coloured anodized finishes will show significant colour changes in exposure times of less than 100 h. In order to facilitate the detection of colour changes, partly mask the exposed surface of the specimens by a material opaque to ultraviolet light. 4.2 Control spe
40、cimens Because of the severity of the test and the fact that it is intended to be used for comparative purposes, it is preferable to use standard coloured anodized specimens of known ultraviolet light resistance for control purposes. Expose any control specimens with the test pieces and partly mask
41、these in a similar way. 4.3 Effect of ozone production The presence of ozone has very little effect on the colour change of coloured anodized specimens. However, if a light surface bloom forms on the surface of specimens tested in an ozone-containing atmosphere, remove this with a mild abrasive clea
42、ner before specimen evaluation. 5 Expression of results Record the exposure time required for the colour change of either the test piece or the control specimen to reach the predetermined level agreed between the customer and the anodizer. 6 Test report The test report shall contain at least the fol
43、lowing information: a) a reference to this International Standard; b) the type and identification of the product tested; c) the colour and, where known, the method of production of the test piece; d) the control specimen used; e) details of apparatus used and time(s) of exposure (see Clause 3); f) t
44、he colour change observed in the test piece compared to the masked area and/or control specimen; g) any deviation, by agreement or otherwise, from the procedure specified; h) the date of the test. This page deliberately left blankThis page deliberately left blankBSI is the independent national body
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