1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 8993:2010Anodizing of aluminium andits alloys Rating systemfor the evaluation of pittingcorrosion Chart method (ISO8993:2010)BS EN ISO 8993:2010 BRITISH STANDARDNationa
2、l forewordThis British Standard is the UK implementation of EN ISO 8993:2010.It supersedes BS EN 12373-18:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/32, Anodic oxidation coatings on aluminium.A list of organizations represented on this com
3、mittee 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 66157 0ICS 25.220.20; 77.060; 77.120.10Compliance with a British Standard cannot confer i
4、mmunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2010.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8993 August 2010 ICS 77.060; 25.220.20 S
5、upersedes EN 12373-18:2001English Version Anodizing 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 (I
6、SO 8993:2010) Anodisieren von Aluminium und Aluminiumlegierungen - 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 conditio
7、ns for giving this European 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 Management Centre or to any CEN member. This European Standard exists in three o
8、fficial versions (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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Aust
9、ria, 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, Sweden, Switzerland and United Kingdom. EURO
10、PEAN COMMITTEE 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 8993:2010: EBS EN ISO 89
11、93:2010EN ISO 8993:2010 (E) 3 Foreword This document (EN ISO 8993:2010) 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 St
12、andard 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 February 2011. Attention is drawn to the possibility that some of the elements
13、 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 12373-18:2001. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following c
14、ountries 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, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, S
15、lovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 8993:2010 has been approved by CEN as a EN ISO 8993:2010 without any modification. BS EN ISO 8993:2010ISO 8993:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Terms and definit
16、ions .1 3 Procedure for rating 2 3.1 Sample preparation .2 3.2 Determination of chart rating .2 4 Expression of results3 5 Test report3 Bibliography11 BS EN ISO 8993:2010ISO 8993:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide f
17、ederation 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 technical committee has been established has the right to be represented on that co
18、mmittee. 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 electrotechnical standardization. International Standards are drafted in accor
19、dance 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 to the member bodies for voting. Publication as an International Standard requir
20、es 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 identifying any or all such patent rights. ISO 8993 was prepared by Technical
21、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 8993:1989), which has been technically revised. BS EN ISO 8993:2010INTERNATIONAL STANDARD ISO 8993:2010(E) ISO 20
22、10 All rights reserved 1Anodizing of aluminium and its alloys Rating system for the evaluation of pitting corrosion Chart method 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 co
23、atings on aluminium and its alloys that 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 corrosi
24、on resulting from penetration of the protective 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
25、or to be covered by the coating, for which 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 an
26、odic oxidation coating is penetrated NOTE Discoloration or other surface defects which do not penetrate the anodic coating do not count as corrosion pits. BS EN ISO 8993:2010ISO 8993:2010(E) 2 ISO 2010 All rights reserved3 Procedure for rating 3.1 Sample preparation A sample area of at least 5 000 m
27、m2is necessary. Use one of the following methods to remove 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
28、min in 30 % nitric acid, prepared by diluting 1 volume of concentrated 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
29、that pitting in the aluminium substrate may be discerned; NOTE 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
30、 toxic and shall be handled properly. Chromium(VI) solutions 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
31、remove deposited copper, then rinse and dry as indicated in 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 o
32、f corrosion pits on the cleaned significant surface with the 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
33、. Disregard effects on the edges of samples. A rating of A 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 indi
34、cated in Table 1. BS EN ISO 8993:2010ISO 8993:2010(E) ISO 2010 All rights reserved 3Table 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
35、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 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
36、The test report shall include at least the following information: a) a reference 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) t
37、he comparison method used, for example, whether the comparison was done visually 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);
38、 NOTE The acceptable chart rating will normally be specified in the relevant corrosion test or product specification. f) the date of the test. BS EN ISO 8993:2010ISO 8993:2010(E) 4 ISO 2010 All rights reservedB1 B2 B3B4 B5 B6Figure 1 Rating charts for designation B (Area of defects u 0,02 %) BS EN I
39、SO 8993:2010ISO 8993:2010(E) ISO 2010 All rights reserved 5C1 C2 C3C4 C5 C6Figure 2 Rating charts for designation C (Area of defects 0,02% and u 0,05 %) BS EN ISO 8993:2010ISO 8993:2010(E) 6 ISO 2010 All rights reservedD4D5D6D1 D2 D3Figure 3 Rating charts for designation D (Area of defects 0,05 % an
40、d u 0,07 %) BS EN ISO 8993:2010ISO 8993:2010(E) ISO 2010 All rights reserved 7E1 E2 E3E4 E5 E6Figure 4 Rating charts for designation E (Area of defects 0,07 % and u 0,10 %) BS EN ISO 8993:2010ISO 8993:2010(E) 8 ISO 2010 All rights reservedF4 F5 F6 F3F2F1Figure 5 Rating charts for designation F (Area
41、 of defects 0,10 % and u 0,25 %) BS EN ISO 8993:2010ISO 8993:2010(E) ISO 2010 All rights reserved 9G1 G2 G3G4 G5 G6Figure 6 Rating charts for designation G (Area of defects 0,25 % and u 0,5 %) BS EN ISO 8993:2010ISO 8993:2010(E) 10 ISO 2010 All rights reservedH1 H2 H3H6H5H4Figure 7 Rating charts for
42、 designation H (Area of defects 0,5 %) BS EN ISO 8993:2010ISO 8993:2010(E) ISO 2010 All rights reserved 11Bibliography 1 ISO 2064:1996, Metallic and other inorganic coatings Definitions and conventions concerning the measurement of thickness 2 ISO 2106, Anodizing of aluminium and its alloys Determin
43、ation 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 This page deliberately left blankThis page deliberately left blankBSI is the independent n
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