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1、BRITISH STANDARD BS EN 12373-19:2001 Incorporating Amendment No. 1 Aluminium and aluminium alloys Anodizing Part 19: Rating system for the evaluation of pitting corrosion Grid method The European Standard EN 12373-19:2001 has the status of a British Standard ICS 25.220.20; 77.120.10 ? Licensed Copy:
2、 sheffieldun sheffieldun, na, Sat Oct 28 07:06:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12373-19:2001 This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes
3、 into effect on 15 July 2001 BSI 30 July 2002 ISBN 0 580 37778 4 National foreword This British Standard is the official English language version of EN 12373-19:2001. It supersedes BS 6161-17:1990 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee STI/32
4、, Anodic oxidation coatings on aluminium, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may
5、 be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users a
6、re responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK
7、interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover. The BSI copyright date displayed in this d
8、ocument indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 1373230 July 2002Addition of supersession details in national foreword Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:06:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN ST
9、ANDARD NORME EUROPENNE EUROPISCHE NORM EN 12373-19 May 2001 ICS 25.220.20; 77.120.10 English version Aluminium and aluminium alloys - Anodizing - Part 19: Rating system for the evaluation of pitting corrosion - Grid method Aluminium et alliages daluminium - Anodisation - Partie 19: Systme de cotatio
10、n de la corrosion par piqres - Mthode par quadrillage Aluminium und Aluminiumlegierungen - Anodisieren - Teil 19: Bewertungssystem fr Lochkorrosion - Rasterzhlmethode This European Standard was approved by CEN on 20 April 2001. CEN members are bound to comply with the CEN/CENELEC Internal Regulation
11、s 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 such national standards may be obtained on application to the Management Centre or to any CEN member. This European
12、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 language and notified to the Management Centre has the same status as the official versions. CEN members are the national st
13、andards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE
14、FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12373-19:2001 E Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:06:15 GMT+00:00 2006, Uncontrolled Copy
15、, (c) BSI Page 2 EN 12373-19:2001 ContentsPage Foreword3 1Scope5 2Terms and definitions5 3Procedure for rating6 4Expression of results 7 5Test report7 Bibliography Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:06:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 12373-19:2001 Forew
16、ord This European Standard has been prepared by 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 lat
17、est by November 2001, and conflicting national standards shall be withdrawn at the latest by November 2001. It is based on ISO 8994 : 1989. EN 12373, Aluminium and aluminium alloys Anodizing, comprises the following parts: Part 1:Method for specifying decorative and protective anodic oxidation coati
18、ngs on aluminium Part 2:Determination of mass per unit area (surface density) of anodic oxidation coatings Gravimetric method Part 3:Determination of thickness of anodic oxidation coatings Non-destructive measurement by split beam microscope Part 4:Estimation of loss of absorptive power of anodic ox
19、idation coatings after sealing by dye spot test with prior acid treatment Part 5:Assessment of quality of sealed anodic oxidation coatings by measurement of admittance Part 6:Assessment of quality of sealed anodic oxidation coatings by measurement of the loss in mass after immersion in phosphoric ac
20、id/chromic acid solution without prior acid treatment Part 7:Assessment of quality of sealed anodic oxidation coatings by measurement of the loss in mass after immersion in phosphoric acid/chromic acid solution with prior acid treatment Part 8:Determination of the comparative fastness to ultra-viole
21、t light and heat of coloured anodic oxidation coatings Part 9:Measurement of wear resistance and wear index of anodic oxidation coatings using an abrasive wheel wear test apparatus Part 10:Measurement of mean specific abrasion resistance of anodic oxidation coatings using an abrasive jet test appara
22、tus Part 11:Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles of 20?, 45?, 60? or 85? Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:06:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 12373-19:2001 Part 12:Measurement of reflectance char
23、acteristics of aluminium surfaces using integrating-sphere instruments Part 13:Measurement of reflectivity characteristics of aluminium surfaces using a goniophotometer or an abridged goniophotometer Part 14:Visual determination of image clarity of anodic oxidation coatings Chart scale method Part 1
24、5:Assessment of resistance of anodic oxidation coatings to cracking by deformation Part 16:Check for continuity of thin anodic oxidation coatings Copper sulfate test Part 17:Determination of electric breakdown potential Part 18:Rating system for the evaluation of pitting corrosion Chart method Part
25、19:Rating system for the evaluation of pitting corrosion Grid method According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany,
26、Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:06:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 12373-19:2001 1Scope This Part of this European Standard
27、 specifies a grid rating system that provides a means of defining levels of performance of anodic oxidation coatings 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 corros
28、ive environments; - practical service tests. It takes into account only pitting corrosion of the basis metal resulting from penetration of the protective anodic oxidation coating. NOTE 1 A related standard, EN 12373-18:2001, describes a similar rating system based on chart scales. NOTE 2 The grid ra
29、ting system is frequently used for rating the results of short term corrosion tests on relatively thin anodic oxidation coatings such as those used in the automotive industry. 2Terms and definitions For the purposes of this standard, the following terms and definitions apply. 2.1 significant surface
30、 part of the surface of an article that is essential to its appearance or serviceability and which is covered by the anodic oxidation coating NOTE 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 co
31、ating is penetrated NOTE Discolouration or other surface defects which do not penetrate the coating do not count as corrosion pits. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:06:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 6 EN 12373-19:2001 3Procedure for rating 3.1 Sample prep
32、aration A sample area of more than 5 000 mm2 is required. 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 wat
33、er and air dry; or b) dip for 5 min to 10 min in 30 % (m/m) 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/chromi
34、c acid mixture; rinse and dry as indicated in a) so that pitting in the aluminium substrate may be discerned. NOTE 1 EN 12373-2 describes 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-colour
35、ed anodic oxidation coatings. 3.2 Determination of grid rating Place a preprinted transparent grid with an area of at least 5 000 mm2, and with grid squares of 5 mm ? 5 mm, over a selected area of the significant surface of the prepared test specimen. Count the number of grid squares occupied by one
36、 or more pits, disregarding effects on the edges of samples. Calculate the percentage of defective squares, i.e. grid squares containing pits, using the formula: N Nt ? 100(1) where: N is the number of defective squares; Nt is the total number of squares. Determine the grid rating from table 1. Lice
37、nsed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:06:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 7 EN 12373-19:2001 Table 1 - Conversion of percentage of defective squares to grid rating Frequency of defective squares (%) Defective squares N of 200 squares Nt Rating number 000 ? 0,511 0,5
38、 to 122 1 to 23 or 43 2 to 45 to 86 4 to 89 to 1612 8 to 1617 to 3225 16 to 3233 to 6450 32 to 6465 to 128100 64 128200 NOTE The greater the number of squares, the more discriminating is the performance level. 4 Expression of results Express the result of the examination as the grid rating and/or th
39、e percentage of defective squares, as appropriate. 5 Test report The test report shall include at least the following information: a) the type and identification of the product tested and, where appropriate, the anodizing, exposure and corrosion test procedures; b) a reference to this European Stand
40、ard; c) the method of sample preparation used (see 3.1); d) the grid rating and/or the percentage of defective squares (see clause 4); NOTE The acceptable grid rating will normally be specified in the relevant corrosion test or product specification. e) the date of the test. Licensed Copy: sheffield
41、un sheffieldun, na, Sat Oct 28 07:06:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 8 EN 12373-19:2001 BIBLIOGRAPHY 1 EN 12373-2Aluminium and aluminium alloys Anodizing Part 2: Determination of mass per unit area (surface density) of anodic oxidation coatings Gravimetric method 2 EN 12373-18:200
42、1Aluminium and aluminium alloys Anodizing Part 18: Rating system for the evaluation of pitting corrosion Chart method Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:06:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:06:15 GMT+0
43、0:00 2006, Uncontrolled Copy, (c) BSI BS EN 12373-19:2001 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is
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