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1、BS EN 12373-7:2002 ICS 25.220.20; 77.120.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Aluminium and aluminium alloys Anodizing Part 7: Assessment of quality of sealed anodic oxidation coatings by measurement of the loss of mass after immersion in phospho
2、ric acid/chromic solution with prior acid treatment Licensed CopyChinese University of Hong Kong, 13/06/2009 05:02, Uncontrolled Copy, (c) BSI This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2009 BSI 2009 ISBN 978 0 580 67453 2 Amend
3、ments/corrigenda issued since publication DateComments BS EN 12373-7:2002 National foreword This British Standard is the UK implementation of EN 12373-7:2002. It supersedes BS EN 12373-7:1999 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee STI/32, Ano
4、dic oxidation coatings on aluminium. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a Britis
5、h Standard cannot confer immunity from legal obligations. Licensed CopyChinese University of Hong Kong, 13/06/2009 05:02, Uncontrolled Copy, (c) BSI BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12373-7 August 2002 ICS 2
6、5.220.20; 77.120.10Supersedes EN 12373-7:1998 English version Aluminium and aluminium alloys - Anodizing - Part 7: Assessment of quality of sealed anodic oxidation coatings by measurement of the loss of mass after immersion in phosphoric acid/chromic acid solution with prior acid treatment Aluminium
7、 et alliages daluminium - Anodisation - Partie 7: Evaluation de la qualit des couches anodiques colmates par mesurage de la perte de masse aprs immersion en solution phosphochromique avec traitement acide pralable Aluminium und Aluminiumlegierungen - Anodisieren - Teil 7: Prfung der Qualitt von verd
8、ichteten, anodisch erzeugten Oxidschichten durch Bestimmung des Masseverlustes nach Eintauchen in Chromphosphorsure- Lsung mit vorheriger Surebehandlung This European Standard was approved by CEN on 10 May 2002. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulat
9、e 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 Standard exists
10、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 standards bodies o
11、f Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUN
12、G Management Centre: rue de Stassart, 36 B-1050 Brussels 2002 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12373-7:2002 E Licensed CopyChinese University of Hong Kong, 13/06/2009 05:02, Uncontrolled Copy, (c) BSI BS EN 12373-7:20
13、02BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002 EN 12373-7:2002 (E) 2 Contents page Foreword3 1Scope 5 2Principle5 3Reagents.5 3.1Predip5 3.2Test solution.5 4Apparatus .5 5Preparation of test piece.6 6Procedure .6 7Expression of results 6 8Test report 7 Annex A (normative) Method for the dr
14、ying of samples.8 Licensed CopyChinese University of Hong Kong, 13/06/2009 05:02, Uncontrolled Copy, (c) BSI BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002 EN 12373-7:2002 (E) 3 Foreword This document EN 12373-7:2002 has been prepared by Technical Committee CEN/TC 132 “Alum
15、inium 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 February 2003, and conflicting national standards shall be withdrawn at the
16、latest by February 2003. This document supersedes EN 12373-7:1998. The following technical change has been made: Subclause “3.1 Predip“ has been revised. In this standard, annex A is normative. EN 12373, Aluminium and aluminium alloys Anodizing, comprises the following parts: Part 1: Method for spec
17、ifying decorative and protective anodic oxidation coatings 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
18、. Part 4: Estimation of loss of absorptive power of anodic oxidation 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
19、 measurement of the loss of mass after immersion in phosphoric acid/chromic acid solution without prior acid treatment. Part 7: Assessment of quality of sealed anodic oxidation coatings by measurement of the loss of mass after immersion in phosphoric acid/chromic acid solution with prior acid treatm
20、ent. Part 8: Determination of the comparative fastness to ultra-violet 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
21、resistance of anodic oxidation coatings using an abrasive jet test apparatus. Part 11: Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles of 20, 45, 60 or 85. Part 12: Measurement of reflectance characteristics of aluminium surfaces using integrating-sphere
22、 instruments. Licensed CopyChinese University of Hong Kong, 13/06/2009 05:02, Uncontrolled Copy, (c) BSI BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002 EN 12373-7:2002 (E) 4 Part 13: Measurement of reflectivity characteristics of aluminium surfaces using a goniophotometer o
23、r an abridged goniophotometer. Part 14: Visual determination of image clarity of anodic oxidation coatings Chart scale method. Part 15: Assessment of resistance of anodic oxidation coatings to cracking by deformation. Part 16: Check for continuity of thin anodic oxidation coatings Copper sulfate tes
24、t. Part 17: Determination of electric breakdown potential. Part 18: Rating system for the evaluation of pitting corrosion Chart method. Part 19: Rating system for the evaluation of pitting corrosion Grid method. According to the CEN/CENELEC Internal Regulations, the national standards organizations
25、of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Licensed CopyChinese Un
26、iversity of Hong Kong, 13/06/2009 05:02, Uncontrolled Copy, (c) BSI BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002 EN 12373-7:2002 (E) 5 1 Scope This European Standard specifies a method of assessing the quality of sealed anodic oxidation coatings on aluminium and its alloy
27、s by measurement of the loss of mass after immersion in phosphoric acid/chromic acid solution with prior acid treatment. A related standard (EN 12373-61) describes the same method used without prior acid treatment. The method is particularly applicable to anodic oxidation coatings intended for archi
28、tectural purposes. For less severe applications, the method described in EN 12373-61) may be more suitable. The method is not applicable to: hard-type anodic oxidation coatings which normally are not sealed; anodic oxidation coatings that have been sealed only in dichromate solutions; anodic oxidati
29、on coatings produced in chromic acid solutions; anodic oxidation coatings that have undergone a treatment to render them hydrophobic. The method is destructive and can serve as a reference method in case of doubt or dispute regarding the results of the test for loss of absorptive power (EN 12373-41)
30、, or the measurement of admittance (EN 12373-51). 2 Principle An unsealed anodic oxidation coating on aluminium is dissolved rapidly by acid media, whereas a well-sealed coating will withstand long immersion without appreciable attack. 3 Reagents Use only reagents of recognized analytical grade and
31、distilled water, or water of equivalent purity. 3.1 Predip Aqueous solution containing (470 15) g/l nitric acid. NOTEThis solution can be obtained, for example, by diluting a 65 % nitric acid solution (20 = 1,40 g/ml) with an equal volume of water. 3.2 Test solution Aqueous solution containing, per
32、litre, 35 ml phosphoric acid (20 = 1,7 g/ml) and 20 g chromium (VI) oxide. 4 Apparatus Usual laboratory apparatus and glassware, together with the following. Laboratory balance, capable of weighing to an accuracy of 0,1 mg. 1)See foreword. Licensed CopyChinese University of Hong Kong, 13/06/2009 05:
33、02, Uncontrolled Copy, (c) BSI BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002 EN 12373-7:2002 (E) 6 5 Preparation of test piece Cut a piece from the material to be tested avoiding contact areas, such that there is an area of approximately 1 dm2, but not less than 0,5 dm2, o
34、f significant surface area. Normally, the mass of the test piece should not exceed 200 g. For hollow extrusions, take the test piece from the end of the sections where the total surface area has an anodic oxidation coating (due to the throwing power of the anodizing electrolyte). NOTEIn special case
35、s, such as certain types of jigging, small hollow sections, etc., it will be necessary to remove the anodic oxidation coating from the inside surface and to carry out the test on the coating on the outer surface of the extrusion. 6 Procedure 6.1Measure the total coated area of the test piece (exclud
36、ing cut edges and other uncoated surfaces). NOTEThe predip and the test solution do not attack bare metal and it is not necessary to take uncoated surfaces into account. 6.2Degrease the test piece in an organic solvent, e.g. acetone or ethanol 96 % (/), at room temperature according to the method de
37、scribed in A.1. 6.3Dry the test piece thoroughly (see A.1 and A.2) and weigh immediately to the nearest 0,1 mg (m1). 6.4Immerse the test piece completely, standing it upright, in the predip (see 3.1) and leave for 10 min at a temperature of 19 C 1 C. 6.5Take the test piece from the predip and rinse
38、thoroughly, first under running water and then in distilled water. 6.6Immerse the test piece completely, standing it upright, in the test solution (see 3.2) and leave for exactly 15 min at a constant temperature of 38 C 1 C. NOTEUniformity of temperature within the test solution is very important ;
39、this can be achieved by using a water-bath and stirring continuously. Do not use the test solution after more than 10 dm of anodized surface have been treated per litre of solution. Do not use test solution which has been in contact with materials other than anodized aluminium or its alloys. 6.7Take
40、 the test piece from the test solution and rinse thoroughly, first under running water and then in distilled water. Dry the test piece as indicated in annex A and weigh immediately to the nearest 0,1 mg (m2). 6.8During the operations described in 6.2 to 6.7, avoid touching the test piece with bare h
41、ands. Take extreme care that the two drying operations in 6.3 and 6.7 are carried out in the same reproducible way and avoid heating to temperatures above 60 C. 7 Expression of results Calculate the loss in mass per unit area of surface, A, in milligrams per square decimetre, using the equation: A m
42、m 21 A = where Licensed CopyChinese University of Hong Kong, 13/06/2009 05:02, Uncontrolled Copy, (c) BSI BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002 EN 12373-7:2002 (E) 7 m1is the mass, in milligrams, of the test piece before immersion in the predip and test solution; m
43、2is the mass, in milligrams, of the test piece after immersion in the predip and test solution; Ais the coated surface area of the test piece, in square decimetres, in contact with the predip and test solution. 8 Test report The test report shall contain at least the following information: a) the ty
44、pe and identification of the product tested; b) a reference to this European Standard; c) how the significant surface area has been determined; d) whether the test solution has been stirred; e) the result of the test (see clause 7); NOTEAcceptance levels will normally be specified in the relevant pr
45、oduct specification. f) any deviation, by agreement or otherwise, from the procedure specified; g) the date of the test. Licensed CopyChinese University of Hong Kong, 13/06/2009 05:02, Uncontrolled Copy, (c) BSI BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002 EN 12373-7:2002
46、 (E) 8 Annex A (normative) Method for the drying of samples A.1Degrease the test piece by gentle agitation for 30 s in a suitable organic solvent at room temperature, remove, leave for 5 min in the ambient atmosphere (pre-drying), place in a drying oven preheated to 60 C and leave for exactly 15 min
47、 with the coated surfaces standing upright. WARNING NOTEWhere organic solvents are used, carry out the degreasing operation and the pre- drying in a well-ventilated area to minimize exposure to solvent vapour. A.2Allow the test piece to cool for 30 min over silica gel in a closed desiccator. A.3Afte
48、r the acid treatment and rinsing (see 6.7), repeat operations A.1 and A.2, omitting the treatment in the organic solvent. Licensed CopyChinese University of Hong Kong, 13/06/2009 05:02, Uncontrolled Copy, (c) BSI BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002BS EN 12373-7:2002 This page has
49、been intentionally left blank Licensed CopyChinese University of Hong Kong, 13/06/2009 05:02, Uncontrolled Copy, (c) BSI BS EN 12373-7:2002 BSI Group Headquarters 389 Chiswick High Road, London, W4 4AL, UK Tel +44 (0)20 8996 9001 Fax +44 (0)20 8996 7001 standards 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 in
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