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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12373-7:1999 The Eu
2、ropean Standard EN 12373-7:1998 has the status of a British Standard ICS 25.220.20; 77.120.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Aluminium and aluminium alloys Anodizing Part 7: Assessment of quality of sealed anodic oxidation coatings by measurement of the loss o
3、f mass after immersion in phosphoric acid/chromic acid solution with prior acid treatment Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Committee for Materials a
4、nd Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 April 1999 BSI 04-1999 ISBN 0 580 32027 8 BS EN 12373-7:1999 Amendments issued since publication Amd. No.DateText affected National foreword This British Standard is the English language version of
5、 EN 12373-7:1998. The UK participation in its preparation was entrusted to Technical Committee STI/32, Anodic oxidation coatings on aluminium, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or
6、proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement i
7、nternational or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to incl
8、ude all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the E
9、N title page, pages 2 to 5 and a back cover. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart
10、 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12373-7:1998 E EUROPEAN STANDARDEN 12373-7 NORME EUROPE ENNE EUROPA ISCHE NORM November 1998 ICS Descriptors: surface treatment, anodizing, aluminium, alumin
11、ium alloys, sealing, quality control, destructive tests, immersion tests, solution, phosphoric acid, measurements, mass losses English version Aluminium and aluminium alloys Anodizing Part7: Assessment of quality of sealed anodic oxidation coatings by measurement of the loss of mass after immersion
12、in phosphoric acid/chromic acid solution with prior acid treatment Aluminium et alliages daluminium Anodisation Partie 7: Evaluation de la qualite des couches anodiques colmate es par mesurage de la perte de masse apre s immersion en solution phosphochromique avec traitement acide pre alable Alumini
13、um und Aluminiumlegierungen Anodisieren Teil 7: Pru fung der Qualita t von verdichteten, anodisch erzeugten Oxidschichten durch Bestimmung des Massenverlustes nach Eintauchen in Chromphosphorsa ure-Lo sung mit vorheriger Sa urebehandlung This European Standard was approved by CEN on 5 November 1998.
14、 CEN members are bound to comply with the CEN/CENELEC Internal Regulations 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
15、application to the Central Secretariat 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 into its own language and notified to the Central Secretariat
16、has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy
17、: sheffieldun sheffieldun, na, Sat Oct 28 06:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 12373-7:1998 BSI 04-1999 Foreword 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 Europe
18、an Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 1999, and conflicting national standards shall be withdrawn at the latest by May 1999. According to the CEN/CENELEC Internal Regulations, the national stan
19、dards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. In this st
20、andard, annex A is normative. EN 12373, Aluminium and aluminium alloys Anodizing, comprises the following parts: Part 1: Method for specifying decorative and protective anodic oxidation coatings on aluminium; Part 2: Determination of mass per unit area (surface density) of anodic oxidation coatings
21、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 oxidation coatings after sealing by dye spot test with prior acid treatment; Part 5: Assessment of qualit
22、y of sealed anodic oxidation coatings by measurement of admittance; Part 6: Assessment of quality of sealed anodic oxidation coatings by 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 anod
23、ic oxidation coatings by measurement of the loss of mass after immersion in phosphoric acid/chromic acid solution with prior acid treatment; Part 8: Determination of the comparative fastness to ultra-violet light and heat of coloured anodic oxidation coatings; Part 9: Measurement of wear resistance
24、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 apparatus; Part 11: Measurement of specular reflectance and specular gloss of anodic oxidation co
25、atings at angles of 208, 458, 608 or 858; Part 12: Measurement of reflectance characteristics 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
26、 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 test; Part 17: Determination of electric breakdow
27、n 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. Contents Page Foreword2 1Scope3 2Principle3 3Reagents3 4Apparatus3 5Preparation of test piece3 6Procedure3 7Expression of results4 8Te
28、st report4 Annex A (normative) Method for the drying of samples5 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 12373-7:1998 BSI 04-1999 1)See foreword. 1 Scope This part of this European Standard specifies a method of assessing t
29、he quality of sealed anodic oxidation coatings on aluminium and its alloys 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 i
30、s particularly applicable to anodic oxidation coatings intended for architectural 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 coa
31、tings that have been sealed only in dichromate solutions; anodic oxidation 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 rega
32、rding the results of the test for loss of absorptive power (EN 12373-41), 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
33、attack. 3 Reagents Use only reagents of recognized analytical grade and distilled water, or water of equivalent purity. 3.1 Predip. Aqueous solution containing, per litre, 650 ml nitric acid (r20= 1,4 g/ml). 3.2 Test solution. Aqueous solution containing, per litre, 35 ml phosphoric acid (r20= 1,7 g
34、/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. 5 Preparation of test piece Cut a test piece from the material to be tested, avoiding contact areas, such that there
35、is an area of approximately 1 dm2, but not less than 0,5 dm2, of 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 th
36、rowing power of the anodizing electrolyte). NOTEIn special cases, 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 Proced
37、ure 6.1 Measure the total coated area of the test piece (excluding 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. Remove any surface bloom from the test piece by rubbing with a dry
38、 cloth. 6.2 Degrease the test piece in an organic solvent, e.g. acetone or ethanol 96 % (V/V), at room temperature according to the method described in A.1. 6.3 Dry the test piece thoroughly (see A.1 and A.2) and weigh immediately to the nearest 0,1 mg (m1). 6.4 Immerse the test piece completely, st
39、anding it upright, in the predip (see 3.1) and leave for 10 min at a temperature of 19 8C1 8C. 6.5 Take the test piece from the predip and rinse thoroughly, first under running water and then in distilled water. 6.6 Immerse the test piece completely, standing it upright, in the test solution (see 3.
40、2) and leave for exactly 15 min at a constant temperature of 38 8C1 8C. NOTEUniformity of temperature within the test solution is very important; this can be achieved by using a water-bath and stirring continuously. Do not use the test solution after more than 10 dm2of anodized surface have been tre
41、ated per litre of solution. Do not use test solution which has been in contact with materials other than anodized aluminium or its alloys. 6.7 Take 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 an
42、nex A and weigh immediately to the nearest 0,1 mg (m2). 6.8 During the operations described in 6.2 to 6.7, avoid touching the test piece with bare hands. 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 ab
43、ove 60 8C. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 06:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ? n coating on alumcoating on alu d media, whereas amedia, whereas nd long immersionong immersi ack. k. gentsents reagentseagen ate ? n an 6 % (V/ /V V V V V), a), aV V thod describe
44、ddescribed test piece thoroupiece thoro gh immediately timmediately 4 4 Immerse themmerse the upright, in thright, in th a tempempe 6 Page 4 EN 12373-7:1998 BSI 04-1999 7 Expression of results Calculate the loss in mass per unit area of surface, dA, in milligrams per square decimetre, using the equa
45、tion: (1)dA= m12 m2 A where m1is the mass, in milligrams, of the test piece before immersion in the predip and test solution; m2is 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 conta
46、ct with the predip and test solution. 8 Test report The test report shall contain at least the following information: a) the type 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
47、has been stirred; e) the result of the test (see clause 7); NOTEAcceptance levels will normally be specified in the relevant product specification. f) any deviation, by agreement or otherwise, from the procedure specified; g) the date of the test. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct
48、28 06:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ? cified in theied in the t or otherwise, fromotherwise, f est. t. ? Page 5 EN 12373-7:1998 BSI 04-1999 Annex A (normative) Method for the drying of samples A.1 Degrease the test piece by gentle agitation for 30 s in a suitable organic solvent a
49、t room temperature; remove; leave for 5 min in the ambient atmosphere (pre-drying); place in a drying oven preheated to 60 8C and leave for exactly 15 min 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.2 Allow the test piece to cool for 30 min over silica gel in a closed desiccator. A