1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 2106:2011Anodizing of aluminium andits alloys Determination ofmass per unit area (surfacedensity) of anodic oxidationcoatings Gravimetric method(ISO 2106:2011)BS EN ISO
2、 2106:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 2106:2011.It supersedes BS EN 12373-2:1999 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/32, Anodic oxidation coatings on aluminium.A list of orga
3、nizations represented on this committee 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 2011ISBN 978 0 580 66152 5ICS 25.220.20; 77.120.10Compliance with a British
4、 Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2011.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2106 March 2011
5、ICS 25.220.20 Supersedes EN 12373-2:1998English Version Anodizing of aluminium and its alloys - Determination of mass per unit area (surface density) of anodic oxidation coatings - Gravimetric method (ISO 2106:2011) Anodisation de laluminium et de ses alliages - Dtermination de la masse par unit de
6、surface (masse surfacique) des couches anodiques - Mthode gravimtrique (ISO 2106:2011) Anodisieren von Aluminium und Aluminiumlegierungen - Bestimmung der Masse je Flcheneinheit (flchenbezogene Masse) von anodisch erzeugten Oxidschichten - Gravimetrisches Verfahren (ISO 2106:2011) This European Stan
7、dard was approved by CEN on 28 February 2011. 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 concernin
8、g such national standards may be obtained on application to the CEN-CENELEC Management Centre 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 it
9、s own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
10、Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-
11、1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2106:2011: EBS EN ISO 2106:2011EN ISO 2106:2011 (E) 3 Foreword The text of ISO 2106:2011 has been prepared by Technical Committee ISO/TC 79 “Light metals and th
12、eir alloys“ of the International Organization for Standardization (ISO) and has been taken over as EN ISO 2106:2011 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, e
13、ither by publication of an identical text or by endorsement, at the latest by September 2011, and conflicting national standards shall be withdrawn at the latest by September 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. C
14、EN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12373-2:1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: A
15、ustria, 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 the United Kingdo
16、m. Endorsement notice The text of ISO 2106:2011 has been approved by CEN as a EN ISO 2106:2011 without any modification. BS EN ISO 2106:2011ISO 2106:2011(E) ISO 2011 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standar
17、ds 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 committee. International organi
18、zations, 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 accordance with the rules given in
19、 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 requires approval by at least 75 %
20、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 2106 was prepared by Technical Committee ISO/TC 79, Light me
21、tals and their alloys, Subcommittee SC 2, Organic and anodic oxidation coatings on aluminium. This third edition cancels and replaces the second edition (ISO 2106:1982), which has been technically revised. It also incorporates the Amendment ISO 2106:1982/Amd.1:1983. BS EN ISO 2106:2011BS EN ISO 2106
22、:2011INTERNATIONAL STANDARD ISO 2106:2011(E) ISO 2011 All rights reserved 1Anodizing of aluminium and its alloys Determination of mass per unit area (surface density) of anodic oxidation coatings Gravimetric method 1 Scope This International Standard specifies a gravimetric method for determining th
23、e mass per unit area (surface density) of anodic oxidation coatings on aluminium and its alloys. The method is applicable to all oxidation coatings formed by anodizing aluminium and its alloys, either cast or wrought, and is suitable for most aluminium alloys, except those in which the copper conten
24、t is greater than 6 %. NOTE 1 A high content of copper in the alloy can lead to increased dissolution of the basis aluminium. NOTE 2 If the thickness is known with sufficient precision (for example, using the method specified in ISO 2128), determination of the mass per unit area (surface density) of
25、 the coatings will enable its apparent density to be calculated. Conversely, if the conditions of application of the coating and its density are known, the determination of its mass per unit area (surface density) can permit calculation of the average mass and an approximate evaluation of the thickn
26、ess (see the Note in Clause 6). 2 Principle The anodic oxidation coating on a weighed test piece of known surface area is dissolved without significantly attacking the basis metal, using a mixture of phosphoric acid and chromium(VI) of specified concentration. After dissolution of the coating, the t
27、est piece is reweighed, and the loss in mass is calculated. The mass loss is related to the unit area covered by the coating, and is expressed in milligrams of coating per square decimetre of surface. NOTE This is a destructive test . 3 Reagent Use only reagents of recognized analytical grade and on
28、ly distilled water or deionized water. 3.1 Phosphoric acid/chromic solution, prepared as follows: phosphoric acid, 20= 1,7 g/ml: 35 ml; chromium(VI) oxide: 20 g; water: make up to 1 000 ml. WARNING Chromium(VI) is toxic and shall be handled properly. Chromium(VI) solutions are hazardous to the envir
29、onment and severely hazardous to waters. BS EN ISO 2106:2011ISO 2106:2011(E) 2 ISO 2011 All rights reserved4 Apparatus Usual laboratory apparatus and glassware, together with the following. 4.1 Laboratory balance, capable of weighing to an accuracy of 0,1 mg. 5 Procedure 5.1 Preparation of test piec
30、e The surface of the test piece to be tested shall have an area of between 0,08 dm2and 1 dm2, and the mass of the test piece shall not exceed 100 g. If the surface is dirty or impregnated with oil, grease or similar material, this shall be removed with the aid of a suitable organic solvent (see Anne
31、x A). To measure the mass of the coating on one surface only of the test piece, the coating on the other surface shall be removed by a mechanical or chemical process, leaving the significant surface intact. Alternatively, a protective agent, resistant to attack by the acidic test solution, shall be
32、applied on the reverse surface of the test piece. 5.2 Performance of the test Calculate the area of the surface covered by an anodic oxidation coating, weigh the test piece to the nearest 0,1 mg and immerse it in the phosphoric acid/chromic solution (see 3.1) for 10 min, at 95 C to 100 C, with effic
33、ient stirring. Rinse the test piece in water, dry and reweigh it (see Annex A). Repeat the immersion, drying and weighing until no further loss in mass is observed. NOTE The freshly made reagent will normally allow complete dissolution of the coating within 10 min. Its dissolving power diminishes wi
34、th use; in general, 1 l of solution is capable of dissolving 12 g of coating before the diminution becomes noticeable. 6 Expression of results Calculate the mass per unit area of surface (surface density) of the coating A, in milligrams per square decimetre, using Equation (1): 12AmmA= (1) where m1i
35、s the mass, in milligrams, of the test piece before dissolution of the coating; m2is the mass, in milligrams, of the test piece after dissolution of the coating; A is the area, in square decimetres, effectively covered by the coating of which the mass is measured (without taking into account edges o
36、r other uncoated parts). NOTE Where required, the average thickness of the coating, , in micrometres, can be estimated, using Equation (2): 10A= (2) where Ais the mass per unit area (surface density), in milligrams per square decimetre, of the coating; is the density, in grams per cubic centimetre,
37、of the coating. BS EN ISO 2106:2011ISO 2106:2011(E) ISO 2011 All rights reserved 3The density of the coating depends on the specific alloy, the anodizing and the sealing process. This density may vary, in normal processing conditions, between 2,3 g/cm3and 3 g/cm3. For thin oxidation coatings on alum
38、inium and its alloys without copper, produced under direct current in sulfuric acid solution, at a temperature of approximately 20 C, the density can be assumed to be equal to 2,6 g/cm3for sealed coatings and 2,4 g/cm3for unsealed coatings. The method gives only an approximate value of the thickness
39、 because of uncertainty about the density value. The estimation of thickness is most accurate for thin coatings (10 m and less). 7 Test report The test report shall include at least the following information: a) a reference to this International Standard; b) the type and identification of the produc
40、t tested; c) the result of the test (see Clause 6); d) anything unusual noticed during the determination; e) any operations not included in the procedure described in this International Standard, or considered to be optional; f) the date of the test. BS EN ISO 2106:2011ISO 2106:2011(E) 4 ISO 2011 Al
41、l rights reservedAnnex A (informative) Recommended method for the drying of samples A.1 Degrease 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
42、 leave for 15 min with the coated surface standing upright. WARNING Where 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 desicca
43、tor. A.3 After the acid treatment (see 5.2), repeat operations A.1 and A.2, omitting the treatment in the organic solvent. BS EN ISO 2106:2011ISO 2106:2011(E) ISO 2011 All rights reserved 5Bibliography 1 ISO 2128, Anodizing of aluminium and its alloys Determination of thickness of anodic oxidation c
44、oatings Non-destructive measurement by split-beam microscope This page deliberately left blankThis page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-related publications, information and services. It presents the UK view o
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