1、May 2011 Translation by DIN-Sprachendienst.English price group 15No 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).ICS 25
2、.220.20!$p40“1771713www.din.deDDIN EN ISO 8251Anodizing of aluminium and its alloys Measurement of abrasion resistance of anodic oxidation coatings(ISO 8251:2011)English translation of DIN EN ISO 8251:2011-05Anodisieren von Aluminium und Aluminiumlegierungen Messung der Abriebfestigkeit von anodisch
3、 erzeugten Oxidschichten (ISO 8251:2011)Englische bersetzung von DIN EN ISO 8251:2011-05Anodisation de laluminium et de ses alliages Dtermination de la rsistance labrasion des couches doxyde anodiques(ISO 8251:2011)Traduction anglaise de DIN EN ISO 8251:2011-05SupersedesDIN EN 12373-9:1999-02 andDIN
4、 EN 12373-10:1999-03www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.3504.11 DIN EN ISO 8251:2011-05 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee ISO/TC 79 “Light me
5、tals and their alloys”, Subcommittee SC 2/WG 16 “Revisions for systematic 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
6、). The responsible German body involved in its preparation was the Normenausschuss Nichteisenmetalle (Nonferrous Metals Standards Committee), Working Committee NA 066-01-09 AA Anodisch oxidiertes Aluminium. The DIN Standards corresponding to the International Standards referred to in this document a
7、re as follows: ISO 565 DIN ISO 565 ISO 2360 DIN EN ISO 2360 ISO 6344-1 DIN ISO 6344-1 ISO 8486-1 DIN ISO 8486-1 Amendments This standard differs from DIN EN 12373-9:1999-02 and DIN EN 12373-10:1999-03 as follows: a) the standard has been adopted as DIN EN ISO 8251:2011-05, and the main title has bee
8、n modified (see National Annex NB); b) Subclause 4.3 “Falling sand abrasion test” has been included; c) the standard has been editorially revised. Previous editions DIN EN 12373-9: 1999-02 DIN EN 12373-10: 1999-03 2 DIN EN ISO 8251:2011-05 National Annex NA (informative) Bibliography DIN EN ISO 2360
9、, Non-conductive coatings on non-magnetic electrically conductive basis materials Measurement of coating thickness Amplitude-sensitive eddy current method DIN ISO 565, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings DIN ISO 6344-1, Coated abrasi
10、ves Grain size analysis Part 1: Grain size distribution test DIN ISO 8486-1, Bonded abrasives Determination and designation of grain size 3 DIN EN ISO 8251:2011-05 4 National Annex NB (informative) Correspondence between the previous standards series DIN EN 12373 “Aluminium and aluminium alloys Anod
11、izing” and the corresponding new ISO and DIN EN ISO Standards Table NB.1 Correspondence previous now DIN EN 12373 DIN EN ISO Anodizing of aluminium and its alloys Part 1 7599 General specifications for anodic oxidation coatings on aluminium The title has been slightly changed Part 2 2106 Determinati
12、on of mass per unit area (surface density) of anodic oxidation coatings Gravimetric method Part 3 2128 Determination of thickness of anodic oxidation coatings Non-destructive measurement by split-beam microscope Part 4 2143 Estimation of loss of absorptive power of anodic oxidation coatings after se
13、aling 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 immersion in phosphoric acid/chromic
14、acid solution The title has been changed: with/without prior acid treatment Part 8 6581 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 coatings The title has bee
15、n 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 instruments Part 13 7759 Meas
16、urement 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 Assessment of resistance of a
17、nodic 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 method Part 19 8994 Rating
18、system for the evaluation of pitting corrosion Grid method EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8251 February 2011 ICS 25.220.20 Supersedes EN 12373-10:1998, EN 12373-9:1998English Version Anodizing of aluminium and its alloys Measurement of abrasion resistance of anodic oxidatio
19、n coatings (ISO 8251:2011) Anodisation de laluminium et de ses alliages Dtermination de la rsistance labrasion des couches doxyde anodiques (ISO 8251:2011) Anodisieren von Aluminium und Aluminiumlegierungen Messung der Abriebfestigkeit von anodisch erzeugten Oxidschichten (ISO 8251:2011) This Europe
20、an Standard was approved by CEN on 29 January 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references conc
21、erning 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 (English, French, German). A version in any other language made by translation under the responsibility of a CEN member in
22、to 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, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,Finland, France, Germany, Greece, Hungary, Iceland, Irela
23、nd, 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 Management Centre: Avenue Marnix 17
24、, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 8251:2011: EContents Page Foreword .3 Introduction.4 1 Scope5 2 Normative references5 3 Terms and definitions .5 4 Characteristics of abrasion tests.6 4.1 A
25、brasive-wheel-wear test .6 4.2 Abrasive jet test.6 4.3 Falling sand abrasion test 6 5 Abrasive-wheel-wear test .7 5.1 Principle .7 5.2 Apparatus.7 5.3 Procedure.7 5.4 Calculation of results8 6 Abrasive jet test.12 6.1 Principle .12 6.2 Apparatus.12 6.3 Procedure.13 6.4 Calculation of results15 7 Fal
26、ling sand abrasion test 16 7.1 Principle .16 7.2 Apparatus.16 7.3 Test specimen17 7.4 Test environment.17 7.5 Test conditions 17 7.6 Test procedure.17 7.7 Expression of results18 8 Test report19 Annex A (normative) Preparation of standard specimen .20 Annex B (informative) Depth survey of abrasion r
27、esistance22 Annex C (informative) Design of abrasive-wheel-wear test apparatus .25 Annex D (informative) Design of abrasive jet test apparatus.26 Annex E (informative) Design of falling sand abrasion test apparatus.30 Bibliography31 EN ISO 8251:2011 (E) DIN EN ISO 8251:2011-05 2EN ISO 8251:2011 (E)
28、3 Foreword This document (EN ISO 8251:2011) 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 shall be given the st
29、atus of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2011, and conflicting national standards shall be withdrawn at the latest by August 2011. Attention is drawn to the possibility that some of the elements of this document may be the sub
30、ject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12373-9:1998 and EN 12373-10:1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are
31、 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, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spa
32、in, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 8251:2011 has been approved by CEN as a EN ISO 8251:2011 without any modification. DIN EN ISO 8251:2011-05 Introduction The resistance of anodic oxidation coatings to abrasion is an important property. As it is depend
33、ent upon the composition of the metal, the thickness of the coating and the conditions of anodizing and sealing, it can give information about the quality of the coating, its potential resistance to erosion or wear and its performance in service. For example, the effect of an abnormally high anodizi
34、ng temperature, which could cause potential deterioration in service by chalking of the surface layers, may be readily detected by means of an abrasive wear resistance test. EN ISO 8251:2011 (E) DIN EN ISO 8251:2011-05 41 Scope This International Standard specifies the following three test methods:
35、a) abrasive-wheel-wear test method, determining the wear resistance and the wear index of anodic oxidation coatings on flat specimens of aluminium and its alloys; b) abrasive jet test method, comparing the resistance to abrasion of anodic oxidation coatings on aluminium and its alloys with that of a
36、 standard specimen or, alternatively, a reference specimen, by use of a jet of abrasive particles; c) falling sand abrasion method, determining the abrasion resistance with falling sand applied to thin anodic oxidation coatings. The use of these methods for coatings produced by hard anodizing is des
37、cribed in ISO 10074. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5
38、65:1990, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings ISO 2360:2003, Non-conductive coatings on non-magnetic electrically conductive basis materials Measurement of coating thickness Amplitude-sensitive eddy-current method ISO 6344-1, Coated a
39、brasives Grain size analysis Part 1: Grain size distribution test ISO 8486-1:1996, Bonded abrasives Determination and designation of grain size distribution Part 1: Macrogrits F4 to F220 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 test sp
40、ecimen specimen on which the test is to be carried out 3.2 standard specimen test specimen produced in accordance with the conditions specified in Annex A EN ISO 8251:2011 (E) DIN EN ISO 8251:2011-05 53.3 reference specimen test specimen produced under conditions agreed between the anodizer and the
41、customer 3.4 double stroke ds one complete reciprocal movement made by the abrasive wheel 4 Characteristics of abrasion tests There are three kinds of abrasion tests: abrasive-wheel-wear test, abrasive jet test and falling sand abrasion test. 4.1 Abrasive-wheel-wear test Determination of the resista
42、nce to abrasion by movement of a test specimen relative to an abrasive paper under a specified pressure. The wear resistance or the wear index of the layers of oxide near the surface, or of the whole oxidation coating thickness, or of any selected intermediate zone may be determined by the method de
43、scribed. For most purposes the wear index (see 5.4.3) or the mass wear index (see 5.4.4) will be the most appropriate characteristic to determine. The method is applicable to all anodic oxidation coatings of thickness more than 5 m on flat aluminium or its alloy specimens. This method is not applica
44、ble to concave or convex specimens; these may be examined using the abrasive jet test method which will give an average value for the abrasive resistance of the coating (see 4.2 and Clause 6). NOTE Minimum test specimen dimensions of 50 mm 50 mm are normally required. 4.2 Abrasive jet test Determina
45、tion of the resistance to abrasion by the impact of abrasive particles projected onto a test specimen. The mean specific abrasion resistance of anodic oxidation coatings may be determined. NOTE 1 Different batches of the same abrasive are liable to give different results and for this reason the test
46、 is a comparative one. NOTE 2 With a suitably designed abrasive jet and film-thickness-measuring devices with a small probe, it is possible to conduct a depth survey which indicates how abrasion resistance varies through the coating thickness (see Annex B). However, this property is preferably measu
47、red using the abrasive-wheel-wear test. The method described is applicable to all anodic oxidation coatings of thickness more than 5 m on aluminium or its alloys. It is primarily intended for surfaces which are not flat. If suitable flat test surfaces are available, the abrasive-wheel-wear test is t
48、he preferred method. Production components may be tested without cutting if the apparatus chamber can accommodate these. NOTE 3 This method is particularly suitable for small test specimens because the individual test area required is only about 2 mm in diameter. 4.3 Falling sand abrasion test Determination of the resistance to abrasion by the impact of freely falling abrasive particles onto anodic oxidation coatings. The method described is applicable to the thin anodic oxida
