1、December 2010 Translation by DIN-Sprachendienst.English price group 11No 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).I
2、CS 25.220.20!$la“1735962www.din.deDDIN EN ISO 8993Anodizing of aluminium and its alloys Rating system for the evaluation of pitting corrosion Chart method (ISO 8993:2010)English translation of DIN EN ISO 8993:2010-12Anodisieren von Aluminium und Aluminiumlegierungen Bewertungssystem fr Lochkorrosion
3、 Richtreihenmethode (ISO 8993:2010)Englische bersetzung von DIN EN ISO 8993:2010-12Anodisation de laluminium et de ses alliages Systme de cotation de la corrosion par piqres Mthode reposant sur des images-types (ISO 8993:2010)Traduction anglaise de DIN EN ISO 8993:2010-12SupersedesDIN EN 12373-18:20
4、01-10www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1812.10 DIN EN ISO 8993:2010-12 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 thei
5、r 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). The respon
6、sible German body involved in its preparation was the Normenausschuss Nichteisenmetalle (Nonferrous Metals Standards Committee), Working Committee NA 066-01-09 AA Anodisch oxidiertes Aluminium. Amendments This standard differs from DIN EN 12373-18:2001-10 as follows: a) the standard has been taken o
7、ver as DIN EN ISO 8993:2010-12 (the main title has been adapted), see National Annex NA; b) the standard has been editorially revised. Previous editions DIN EN 12373-18: 2001-10 DIN EN ISO 8993:2010-12 3 National Annex NA (informative) Correspondence between the previous standards series DIN EN 1237
8、3 “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 changed Part 2 2106 Determinati
9、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
10、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
11、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 coatings The title has been cha
12、nged 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 Measureme
13、nt 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 anodic
14、 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 syste
15、m for the evaluation of pitting corrosion Grid method Anodizing of aluminium and its alloys 6581DIN EN ISO 8993:2010-12 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8993 August 2010 ICS 77.060; 25.220.20 Supersedes EN 12373-18:2001English Version Anodiz
16、ing of aluminium and its alloys - Rating system for the evaluation of pitting corrosion - Chart method (ISO 8993:2010)Anodisation de laluminium et de ses alliages - Systme de cotation de la corrosion par piqres - Mthode reposant sur des images-types (ISO 8993:2010) Anodisieren von Aluminium und Alum
17、iniumlegierungen - Bewertungssystem fr Lochkorrosion - Richtreihenmethode (ISO 8993:2010) This European Standard was approved by CEN on 31 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
18、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 Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A ve
19、rsion in any other language made by translation 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 R
20、epublic, 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 COMMITTEE FOR STANDARDIZATION COMIT EUROPEN
21、 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 8993:2010: EContents EN ISO 8993:2010 (E) DIN EN ISO 8993:2010-12 2 Page
22、 Foreword3 1 Scope 4 2 Terms and definitions .4 3 Procedure for rating 5 3.1 Sample preparation .5 3.2 Determination of chart rating .5 4 Expression of results 6 5 Test report 6 Bibliography 14 Foreword This document (EN ISO 8993:2010) has been prepared by Technical Committee ISO/TC 79 “Light metals
23、 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 status of a national standard, either by publication of an identical text or by endorsement, at the latest by
24、February 2011, and conflicting national standards shall be withdrawn at the latest by February 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
25、patent rights. This document supersedes EN 12373-18:2001. 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, F
26、inland, France, Germany, 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 8993:2010 has been approved by CEN as a E
27、N ISO 8993:2010 without any modification. EN ISO 8993:2010 (E) DIN EN ISO 8993:2010-12 3 1 Scope This International Standard specifies a chart rating system based on standard charts that provides a means of defining levels of performance of anodic oxidation coatings on aluminium and its alloys that
28、have been subjected to corrosion tests. This rating system is applicable to pitting corrosion resulting from accelerated tests, exposure to corrosive environments, and practical service tests. This International Standard takes into account only pitting corrosion resulting from penetration of the pro
29、tective anodic oxidation coating. NOTE ISO 89943describes a similar rating system based on defined grids. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 significant surface part of the article covered or to be covered by the coating, for whi
30、ch the coating is essential for serviceability and/or appearance NOTE 1 Adapted from ISO 2064:19961, definition 3.1. NOTE 2 The edges of an article are not normally included in the significant surface. 2.2 corrosion pit surface corrosion defect at which the anodic oxidation coating is penetrated NOT
31、E Discoloration or other surface defects which do not penetrate the anodic coating do not count as corrosion pits. EN ISO 8993:2010 (E) DIN EN ISO 8993:2010-12 4 3 Procedure for rating 3.1 Sample preparation A sample area of at least 5 000 mm2is necessary. Use one of the following methods to remove
32、corrosion products or deposits on the surface so that corrosion pits may be clearly discerned: a) wipe with a slurry of fine pumice to abrade away corrosion products and dirt, then rinse in clean water and air dry; or b) dip for 5 min to 10 min in 30 % nitric acid, prepared by diluting 1 volume of c
33、oncentrated nitric acid (20= 1,40 g/ml) with 1 volume of water at 20 C to 25 C; rinse and dry as indicated in a); or c) dissolve the anodic oxidation coating in a hot phosphoric acid/chromic acid mixture; rinse and dry as indicated in a) so that pitting in the aluminium substrate may be discerned; N
34、OTE 1 ISO 21062describes the preparation and use of this reagent for the purposes of dissolution of the anodic oxidation coating. NOTE 2 This method is particularly useful for dark-coloured anodic oxidation coatings. WARNING Chromium (VI) is toxic and shall be handled properly. Chromium(VI) solution
35、s are hazardous to the environment and severely hazardous to waters. or d) wipe with soft textile gauze dipped in dilute hydrochloric acid solution (100 ml of 35 % to 37 % HCl, made up to 1 000 ml with distilled water or deionized water) to remove deposited copper, then rinse and dry as indicated in
36、 a). 3.2 Determination of chart rating Select an area of at least 5 000 mm2on the significant surface of the sample. NOTE A mask with an opening of 50 mm 100 mm can be used to define the area to be evaluated. Compare the size and frequency of corrosion pits on the cleaned significant surface with th
37、e rating charts given in Figures 1 to 7. The rating charts show the maximum limit of corroded area for rating designation. The rating chart will be the chart designation which most closely resembles the corroded sample, for example, B2 or C5. Disregard effects on the edges of samples. A rating of A
38、indicates no visible corrosion, and a rating of H indicates the greatest degree of corrosion covered by this International Standard. A conversion of chart rating to percentage area of the significant surface covered by corrosion pits is indicated in Table 1. EN ISO 8993:2010 (E) DIN EN ISO 8993:2010
39、-12 5 Table 1 Conversion of chart rating to percentage area covered by corrosion pits Chart rating Percentage area of corrosion pits A None B1 B2 B3 B4 B5 B6 u 0,02 C1 C2 C3 C4 C5 C6 0,02 and u 0,05 D1 D2 D3 D4 D5 D6 0,05 and u 0,07 E1 E2 E3 E4 E5 E6 0,07 and u 0,10 F1 F2 F3 F4 F5 F6 0,10 and u 0,25
40、 G1 G2 G3 G4 G5 G6 0,25 and u 0,5 H1 H2 H3 H4 H5 H6 0,5 4 Expression of results Express the result of the examination as the chart rating and/or the percentage area covered by corrosion pits, as appropriate. 5 Test report The test report shall include at least the following information: a) a referen
41、ce to this International Standard; b) the type and identification of the product tested and, where appropriate, the anodizing, exposure and corrosion test procedure; c) the method of sample preparation used (see 3.1); d) the comparison method used, for example, whether the comparison was done visual
42、ly or electronically; in the case of comparison by an electronic method, the specification of the test apparatus shall also be given; e) the chart rating and/or the percentage area covered by corrosion pits (see Clause 4); NOTE The acceptable chart rating will normally be specified in the relevant c
43、orrosion test or product specification. f) the date of the test. EN ISO 8993:2010 (E) DIN EN ISO 8993:2010-12 6 B1 B2 B3B4 B5 B6Figure 1 Rating charts for designation B (Area of defects u 0,02 %) EN ISO 8993:2010 (E) DIN EN ISO 8993:2010-12 7 C1 C2 C3C4 C5 C6Figure 2 Rating charts for designation C
44、(Area of defects 0,02% and u 0,05 %) EN ISO 8993:2010 (E) DIN EN ISO 8993:2010-12 8 D4D5D6D1 D2 D3Figure 3 Rating charts for designation D (Area of defects 0,05 % and u 0,07 %) EN ISO 8993:2010 (E) DIN EN ISO 8993:2010-12 9 E1 E2 E3E4 E5 E6Figure 4 Rating charts for designation E (Area of defects 0,
45、07 % and u 0,10 %) EN ISO 8993:2010 (E) DIN EN ISO 8993:2010-12 10 F4 F5 F6 F3F2F1Figure 5 Rating charts for designation F (Area of defects 0,10 % and u 0,25 %) EN ISO 8993:2010 (E) DIN EN ISO 8993:2010-12 11 G1 G2 G3G4 G5 G6Figure 6 Rating charts for designation G (Area of defects 0,25 % and u 0,5
46、%) EN ISO 8993:2010 (E) DIN EN ISO 8993:2010-12 12 H1 H2 H3H6H5H4Figure 7 Rating charts for designation H (Area of defects 0,5 %) EN ISO 8993:2010 (E) DIN EN ISO 8993:2010-12 13 Bibliography 1 ISO 2064:1996, Metallic and other inorganic coatings Definitions and conventions concerning the measurement
47、 of thickness 2 ISO 2106, Anodizing of aluminium and its alloys Determination of mass per unit area (surface density) of anodic oxidation coatings Gravimetric method 3 ISO 8994, Anodizing of aluminium and its alloys Rating system for the evaluation of pitting corrosion Grid method EN ISO 8993:2010 (E) DIN EN ISO 8993:2010-12 14
