EN ISO 7668-2010 en Anodizing of aluminium and its alloys - Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles of 20 degrees 45 degrees 6.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 7668:2010Anodizing of aluminium andits alloys Measurementof specular reflectance andspecular gloss of anodicoxidation coatings at anglesof 20 degrees, 45 degrees, 60deg

2、rees or 85 degrees (ISO7668:2010)BS EN ISO 7668:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 7668:2010.It supersedes BS EN 12373-11:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/32, Anodic oxi

3、dation coatings on aluminium.A list 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 66001 6ICS 25

4、.220.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2010.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EURO

5、PISCHE NORM EN ISO 7668 November 2010 ICS 25.220.20 Supersedes EN 12373-11:2000English Version Anodizing of aluminium and its alloys - Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles of 20 degrees, 45 degrees, 60 degrees or 85 degrees (ISO 7668:2010) Ano

6、disation de laluminium et de ses alliages - Mesurage des caractristiques de rflectivit et de brillant spculaires des couches anodiques angle fixe de 20 degrs, 45 degrs, 60 degrs ou 85 degrs (ISO 7668:2010) Anodisieren von Aluminium und Aluminiumlegierungen - Messung des gerichteten Reflexionsgrades

7、und des Spiegelglanzes von anodisch erzeugten Oxidschichten bei Winkeln von 20, 45, 60 oder 85 (ISO 7668:2010) This European Standard was approved by CEN on 30 October 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europ

8、ean Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions

9、 (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Bel

10、gium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COM

11、MITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR 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 7668:2010: EBS EN ISO 7668:2010E

12、N ISO 7668:2010 (E) 3 Foreword This document (EN ISO 7668:2010) has been prepared by Technical Committee ISO/TC 79 “Light metals and their alloys” in collaboration with Technical Committee CEN/TC 132 “Aluminium and aluminium alloys” the secretariat of which is held by AFNOR. This European Standard s

13、hall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2011, and conflicting national standards shall be withdrawn at the latest by May 2011. Attention is drawn to the possibility that some of the elements of this document

14、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 12373-11:2000. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound

15、 to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sw

16、eden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 7668:2010 has been approved by CEN as a EN ISO 7668:2010 without any modification. BS EN ISO 7668:2010ISO 7668:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Terms and definition

17、s .1 3 Principle .1 4 Apparatus and geometric conditions2 5 Optical standards 7 5.1 Reference standards.7 5.2 Working standards7 6 Preparation and calibration of apparatus .7 7 Measurement of specular reflectance and specular gloss .8 7.1 General .8 7.2 Measurement of specular reflectance.8 7.3 Meas

18、urement of specular gloss.8 8 Expression of results11 8.1 General .11 8.2 Specular reflectance .11 8.3 Specular gloss .11 9 Test report11 Annex A (normative) Specular reflectance and specular gloss of black glass12 Bibliography13 BS EN ISO 7668:2010ISO 7668:2010(E) iv ISO 2010 All rights reservedFor

19、eword 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 tech

20、nical 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

21、 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 Standards. Draft International Standards adopted by the technical committees are circulated t

22、o the member bodies for voting. Publication 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

23、 identifying any or all such patent rights. ISO 7668 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 7668:1986), which has been technic

24、ally revised. BS EN ISO 7668:2010ISO 7668:2010(E) ISO 2010 All rights reserved vIntroduction Specular reflectance and specular gloss are not unique physical properties of a surface. They vary with the angle of measurement, and with the aperture dimensions that define the incident and the reflected b

25、eams, such that measurements of these properties are not independent of the apparatus being used. The specular reflectance of most surfaces increases with the angle of measurement and accounts for the use of reflectometers with various angles as, for example, for painted surfaces. The specular refle

26、ctance characteristics of anodized aluminium, however, do not always behave in the normal manner and, because of its property of double reflection, reflected light comes partly from the film surface and partly from the underlying metal. It is advisable to measure the specular reflectance characteris

27、tics at 20, 45, 60, and 85 to obtain a complete understanding of the specular reflectance properties of the anodized surface, and careful thought should be given to which method or methods are most relevant in any particular situation. The specular reflectance of bright-anodized aluminium with a mir

28、ror finish is best measured using 45 or 20 geometry. BS EN ISO 7668:2010BS EN ISO 7668:2010INTERNATIONAL STANDARD ISO 7668:2010(E) ISO 2010 All rights reserved 1Anodizing of aluminium and its alloys Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles of 20,

29、45, 60 or 85 1 Scope This International Standard specifies methods for the measurement of specular reflectance and specular gloss of flat samples of anodized aluminium using geometries of 20 (Method A), 45 (Method B), 60 (Method C) and 85 (Method D); and of specular reflectance by an additional 45 m

30、ethod (Method E) employing a narrow acceptance angle. The methods described are intended mainly for use with clear anodized surfaces. They can be used with colour-anodized aluminium, but only with similar colours. 2 Terms and definitions For the purposes of this document, the following terms and def

31、initions apply. 2.1 specular reflectance ratio of the luminous flux, reflected in the specular direction for a specified source and receptor angle, to the luminous flux of the incident light, normally expressed as a percentage 2.2 specular gloss ratio of the luminous flux, reflected from an object i

32、n the specular direction for a specified source and receptor angle, to the luminous flux reflected from glass with a refractive index of 1,567 in the specular direction NOTE To set the specular gloss scale, polished black glass with a refractive index of 1,567 is assigned the value of 100 for geomet

33、ries of 20, 45, 60 and 85 (see Table 5). The phenomenon of light reflectance by anodized aluminium is very different to that of black glass and the choice of a black-glass standard is arbitrary and made to allow comparison of different qualities of anodized aluminium. 3 Principle The specular reflec

34、tance and specular gloss of anodized aluminium surfaces are measured under defined conditions using, as required, geometries of 20, 45, 60 and 85. BS EN ISO 7668:2010ISO 7668:2010(E) 2 ISO 2010 All rights reserved4 Apparatus and geometric conditions Usual laboratory apparatus and in particular the f

35、ollowing. 4.1 General. Approximate comparisons between surfaces of the same colour can be made, but an accurate measurement requires the combination of light source, photoelectric cell and associated colour filters to give a spectral sensitivity, approximating to the CIE photopic luminous efficiency

36、 function, weighted for CIE standard illuminants C (see CIE 38:19771) or D65. NOTE Since specular reflection is in general spectrally non-selective, the spectral characteristics of the light source (4.2) and the detector (4.4) need not be critically controlled for the measurement of normal uncoloure

37、d anodized surfaces. 4.2 Polychromatic light source and housing, with a lens that directs a parallel, or very slightly converging, beam of light onto the surface under test. 4.3 Means for locating the specimen surface, in the correct position for measurement. 4.4 Receptor housing containing a lens,

38、a receptor aperture and a photoelectric cell, to receive the cone of reflected light. 4.5 Sensitivity control, for setting the photocell current to any desired value on the instrument scale or digital indicator. 4.6 Receptor meter, capable of giving an indication proportional to the light flux passi

39、ng the receptor aperture within 1 % of the full-scale reading. Spectral corrections are not usually required (see Note to 4.1). 4.7 Geometric conditions The incident angle, 1, which is the angle between the axis of the incident beam and the perpendicular to the surface under test, shall have the fol

40、lowing values and tolerances: for Method A: 20 0,1; for Method B: 45 0,1; for Method C: 60 0,1; for Method D: 85 0,1; for Method E: 45 0,1. There shall be no vignetting of rays that lie within the angles specified above. The axis of the receptor shall, as far as possible, coincide with the mirror im

41、age of the axis of the incident beam; the receptor angle, 2, which is the angle between the axis of the receptor and the perpendicular to the surface under test, shall be for all methods such that: |1 2| u 0,1 With a flat piece of polished glass or other front-surface mirror in the test panel positi

42、on, an image of the source shall be formed at the centre of the receptor aperture. The width of the illustrated area of the test panel shall be not less than 10 mm. The angular dimensions of the receptor apertures shall be measured from the receptor lenses. The dimensions and tolerances of the sourc

43、es and receptors shall be as indicated in Tables 1 and 2. Figures 1, 2 and 3 give generalized illustrations of these dimensions. Table 1 gives both angles and corresponding dimensions calculated for lenses of a focal length of 50 mm for Methods A, B, C and D. Table 2 gives the angles and aperture di

44、mensions for Method E. The angles are mandatory and the aperture sizes have been calculated from the corresponding angle, , as 2f (tan /2), where f is the focal length of the receptor lens. BS EN ISO 7668:2010ISO 7668:2010(E) ISO 2010 All rights reserved 3Table 1 Angles and dimensions of source imag

45、e and receptor apertures for Methods A,B,C and D In plane of measurement Perpendicular to plane of measurement Method(s) Instrument characteristics Angle 1degrees () Dimensionamm Angle 2degrees () Dimensionamm A,B,C and D Source image size Tolerance 0,75(1) 0,25 0,65 0,22 2,5(2)b0,5 2,18b0,44 A 20 R

46、eceptor aperture Tolerance 1,80(1) 0,05 1,57 0,04 3,6(2) 0,1 3,14 0,09 B 45 Receptor aperture Tolerance 4,4(1) 0,1 3,84 0,09 11,7(2) 0,2 10,25 0,17 C 60 Receptor aperture Tolerance 4,4(1) 0,1 3,84 0,09 11,7(2) 0,2 10,25 0,17 D 85 Receptor aperture Tolerance 4,0(1) 0,3 3,49 0,26 6,0(2) 0,3 5,24 0,26

47、aCalculated for a focal length of 50 mm. For any other focal length, f, these dimensions shall be multiplied by f/50. b0,75 0,25, corresponding to dimensions of 0,65 mm 0,22 mm, i.e. the same as those in the plane of measurement, is also recommended.Table 2 Angles and dimensions of circular source i

48、mage and circular receptor aperture for 45 reflectometer of Method E Instrument characteristics Angle degrees () Dimensiona mm Source image size Tolerance 3,44 0,23 1,5 0,1 45 Receptor aperture Tolerance 3,44 0,23 1,5 0,1 aCalculated for focal length of 25,4 mm. For any other focal length, f, the ap

49、erture diameter is equal to 2f (tan /2).BS EN ISO 7668:2010ISO 7668:2010(E) 4 ISO 2010 All rights reserveda) In plane of measurement b) Perpendicular to plane of measurement Key 1 axis G filament lamp L1condenser lens L2collimator lens L3receptor lens S effective light source (pin note) P test surface B receptor field aperture I source image R photoelectric cell 1source image angles (in plane of measur