1、BSI Standards PublicationBS EN ISO 28764:2015Vitreous and porcelain enamels Production of specimens fortesting enamels on sheet steel,sheet aluminium and cast ironBS EN ISO 28764:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 28764:2015.It supersedes B
2、S EN ISO 28764:2011 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/36, Vitreous enamel coatings.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the ne
3、cessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 86618 0ICS 25.220.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard wa
4、s published under the authority of theStandards Policy and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 28764 November 2015 ICS 25.220.50 Supersedes EN ISO 28764:2011English V
5、ersion Vitreous and porcelain enamels - Production of specimens for testing enamels on sheet steel, sheet aluminium and cast iron (ISO 28764:2015) maux vitrifis - Production dprouvettes pour lessai des maux sur la tle dacier, la tle daluminium et la fonte (ISO 28764:2015) Emails und Emaillierungen -
6、 Herstellung von Proben zur Prfung von Stahlblech-Emails, Aluminium-Emails und Gusseisen-Emails (ISO 28764:2008) This European Standard was approved by CEN on 24 October 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Eur
7、opean 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-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versio
8、ns (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-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, B
9、elgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Swi
10、tzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nation
11、al Members. Ref. No. EN ISO 28764:2015 EBS EN ISO 28764:2015EN ISO 28764:2015 (E) 3 European foreword This document (EN ISO 28764:2015) has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings“ in collaboration with Technical Committee CEN/TC 262 “Metallic and other
12、 inorganic coatings” the secretariat of which is held by BSI. 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 May 2016, and conflicting national standards shall be withdrawn at the latest by May 2
13、016. Attention is drawn to the possibility that some of the elements 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 ISO 28764:2011. According to the CEN-CENELEC Internal
14、 Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Irela
15、nd, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 28764:2015 has been approved by CEN as EN ISO 28764:2015 without any modification. BS EN
16、ISO 28764:2015ISO 28764:2015(E)Foreword iv1 Scope . 12 Normative references 13 Designation 14 Specimens from production articles 14.1 Requirements for the articles used . 14.2 Shape and dimensional requirements 24.3 Preparation 25 Specially produced specimens . 25.1 Shape, dimension and substrate re
17、quirements 25.1.1 General 25.1.2 Steel substrate 25.1.3 Cast iron substrate . 25.1.4 Aluminium substrate 35.1.5 Other substrates . 35.2 Enamelling of specimens 35.2.1 General 35.2.2 Steel enamelling . 35.2.3 Cast iron enamelling . 45.2.4 Aluminium enamelling . 45.2.5 Enamelling of other substrates .
18、 45.3 Surfaces of enamelled specimens . 4Bibliography 5 ISO 2015 All rights reserved iiiContents PageBS EN ISO 28764:2015ISO 28764:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing
19、 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 organizations, governmental and non-governmental, in liais
20、on with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Direc
21、tives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that som
22、e 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. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declara
23、tions received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information abou
24、t ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 107, Metallic and other inorganic coatings.This second edition cancels and replaces the first edition (ISO
25、28764:2008), of which it constitutes a minor revision.iv ISO 2015 All rights reservedBS EN ISO 28764:2015INTERNATIONAL STANDARD ISO 28764:2015(E)Vitreous and porcelain enamels Production of specimens for testing enamels on sheet steel, sheet aluminium and cast ironWARNING This International Standard
26、 calls for the use of substances and/or procedures that may be injurious to health if adequate safety measures are not taken. This International Standard does not address any health hazards, safety or environmental matters associated with its use. It is the responsibility of the user of this Interna
27、tional Standard to establish appropriate health, safety and environmentally acceptable practices and take suitable actions for any national and international regulations. Compliance with this International Standard does not of itself confer immunity from legal obligations.1 ScopeThis International S
28、tandard specifies a method for the production of specimens suitable for testing vitreous and porcelain enamel coatings.It specifies two different specimens: specimens taken from production articles; specially produced specimens.NOTE Only the specially produced specimens can be used when the loss in
29、mass per unit area of the enamel coating is to be determined quantitatively, as specimens cut from enamelled articles can reduce the accuracy of the test method.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for i
30、ts application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 2746, Vitreous and porcelain enamels High voltage test3 DesignationSpecimens prepared in accordance with this Internation
31、al Standard shall have the following designation:Specimen: ISO 28764-(substrate)where a steel substrate is designated by A, a cast iron substrate by B and an aluminium substrate by C.EXAMPLE The designation of a specimen prepared in accordance with this International Standard using a steel substrate
32、 is:Specimen ISO 28764-A4 Specimens from production articles4.1 Requirements for the articles usedThe specimens shall be taken from a production article that has been produced using the normal production parameters. Reworked articles shall not be used as a source of specimens. ISO 2015 All rights re
33、served 1BS EN ISO 28764:2015ISO 28764:2015(E)4.2 Shape and dimensional requirementsThe specimens shall be circular or square, with a diameter or side length of 105 mm 5 mm.The specimens shall normally be taken only from flat areas of the enamelled articles. For enamelled aluminium specimens, however
34、, on which only the adherence is to be determined using the procedure given in ISO 138051, other shapes may be used.4.3 PreparationBefore cutting specimens off a production article, the enamel shall be removed by grinding along the cutting line on both surfaces (i.e. front and back) of the productio
35、n article down to the base metal. The width of the zone from which the enamel shall be removed shall be the width of the cutting tool plus 2 mm on each side.NOTE Grinding machines operating with corundum or diamond stones are suitable for removing the enamel.5 Specially produced specimens5.1 Shape,
36、dimension and substrate requirements5.1.1 GeneralThe specimens shall be made from a substrate that can be enamelled and shall be flat, circular or square plates with a diameter or side length of 105 mm +105mm.If a specimen is intended to hang during weighing and/or enamelling, the specimen shall be
37、provided with a hole to enable it to be hung. The hole shall be approximately 2,5 mm in diameter with its centre either 3 mm from the edge of a circular test plate or 3 mm from the corner of a square test plate.5.1.2 Steel substrateThe sheet steel to which the enamel is applied shall be of an approp
38、riate enamelling quality for the enamelling process used and its thickness shall normally be between 0,3 mm and 3,0 mm.Other thicknesses may be used if agreed between the interested parties; if other thicknesses are used (i.e. thicknesses not within the range 0,3 mm to 3 mm) the thickness shall be c
39、learly reported with every test result obtained.Condition the metal for enamelling using any recognized method, but use the same method, substrate quality and substrate thickness if the specimens are provided for comparison purposes.In the case of fish-scale testing, take steel strips a minimum of 1
40、00 mm wide from across the whole width of the steel coil.NOTE 1 EN 102092describes the steel quality required when enamelling cold-rolled steel using different processes.NOTE 2 Clause B.2 of EN 10209:20132describes the fish-scale test.5.1.3 Cast iron substrateThe cast iron to which the enamel is app
41、lied shall be of enamelling quality.The specimens may be specially cast plates or plates cut from a cast iron bar with a minimum thickness of 2,5 mm. If the mass of cut specimens is to be determined in order to determine the loss in mass of the enamel coating, and the mass exceeds the carrying capac
42、ity of the analytical balance, the thickness may be reduced by machining.2 ISO 2015 All rights reservedBS EN ISO 28764:2015ISO 28764:2015(E)Condition the metal for enamelling using any recognized method, but use the same method, substrate quality and substrate thickness if the specimens are provided
43、 for comparison purposes.Completely ferritized grey cast iron is suitable. Pre-annealing between 700 C and 850 C for 10 min to 15 min may be used in order to achieve the ferritization.5.1.4 Aluminium substrateThe aluminium to which the enamel is applied shall be of enamelling quality. Aluminium shee
44、t specimens shall have a thickness between 2 mm and 3 mm.Condition the metal for enamelling using any recognized method, but use the same method, substrate quality and substrate thickness if the specimens are provided for comparison purposes.NOTE The following aluminium alloys are suitable for sheet
45、 substrates if their Mg content is below a mass fraction of 0,01 %: alloys EN AW-1050A, EN AW-3003 and EN AW-4006 as described in EN 573-3.35.1.5 Other substratesFor vitreous and porcelain enamels used on other substrates, the substrate used and the conditioning parameters shall be agreed between th
46、e interested parties.5.2 Enamelling of specimens5.2.1 GeneralThe normal processing steps of the enamelling process, i.e. those used in that particular process, shall be followed and no extra steps (such as repair enamelling or extra firing) shall be used for the production of the specimen.Care shall
47、 be taken to ensure that there is a minimum of build-up of enamel around the edges of the specimen. The enamel applied can, therefore, be wiped, using a suitable method, from the edges to a width of 2 mm or 3 mm after drying and before fusing the specimen.Comparative specimens shall be of the same n
48、ominal thickness. The maximum difference in thickness between all comparative specimens shall be less than 15 %.In all cases, the thickness of the enamel coating applied to the test specimen shall be that normally used in the enamelling of the production article.5.2.2 Steel enamelling5.2.2.1 Applica
49、tionThe enamel shall be applied to one or both sides of the specimen. When the loss in mass per unit area of the enamel coating is to be determined quantitatively, the specimen shall be enamelled on both sides.5.2.2.2 Direct-on enamelsWhen in practice the usual application consists of one coat only, one coat shall be applied. In cases where additional coatings are a necessary part of the finish, these coatings shall also be applied.5.2.2.3 Cover coat enamelsIf a ground coat is applied prior to application of the cover coat, this may b
