1、July 2017 English price group 13No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 25.220.50!%h8Z“2692155www.din.deDIN
2、 EN ISO 28706-2Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 2: Determination of resistance to chemical corrosion by boiling acids, boiling neutral liquids, alkaline liquids and/or their vapours (ISO 287062:2017);English version EN ISO 287062:2017,English tran
3、slation of DIN EN ISO 28706-2:2017-07Emails und Emaillierungen Bestimmung der Bestndigkeit gegen chemische Korrosion Teil 2: Bestimmung der Bestndigkeit gegen chemische Korrosion durch kochende Suren, kochende neutrale Flssigkeiten, alkalische Flssigkeiten und/oder deren Dmpfe (ISO 287062:2017);Engl
4、ische Fassung EN ISO 287062:2017,Englische bersetzung von DIN EN ISO 28706-2:2017-07maux vitrifis Dtermination de la rsistance la corrosion chimique Partie 2: Dtermination de la rsistance la corrosion chimique par des acides bouillants, des liquides neutres bouillants, ou des liquides alcalins et/ou
5、 leurs vapeurs (ISO 287062:2017);Version anglaise EN ISO 287062:2017,Traduction anglaise de DIN EN ISO 28706-2:2017-07SupersedesDIN EN ISO 287062:201108www.beuth.deDocument comprises 28 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authori
6、tative.07.17 DIN EN ISO 28706-2:2017-07 2 A comma is used as the decimal marker. National foreword This document (EN ISO 28706-2:2017) 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
7、inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Working Committee NA 062-
8、01-63 AA “Testing of vitreous and porcelain enamels”. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 48 DIN ISO 48 ISO 718 DIN ISO 718 ISO 1629 DIN ISO 1629 ISO 3585 DIN ISO 3585 ISO 3696 DIN ISO 3696 ISO 4788 DIN EN ISO 4788 ISO 28706
9、-1:2008 DIN EN ISO 28706-1:2011-08 ISO 28706-3:2008 DIN EN ISO 28706-3:2011-08 ISO 28706-4:2016 DIN EN ISO 28706-4:2016-07 ISO 28706-5:2010 DIN EN ISO 28706-5:2011-09 ISO 28764 DIN EN ISO 28764 Amendments This standard differs from DIN EN ISO 28706-2:2011-08 as follows: a) further reagents have been
10、 included; b) a new, additional test solution has been included. Previous editions DIN 6050: 1942-10 DIN 51151: 1957-03, 1968-07 DIN 51157: 1959-08 DIN 51157-1: 1967-02 DIN 51157-2: 1967-02 DIN 51165: 1968x-07 DIN ISO 2733: 1982-11, 1984-08 DIN ISO 2742: 1982-11, 1984-06 DIN ISO 2743: 1982-11, 1987-
11、03 DIN ISO 2744: 1982-11, 1984-07, 1984-11 DIN EN 14483-2: 2004-09 DIN EN ISO 28706-2: 2011-08 DIN EN ISO 28706-2:2017-07 3 National Annex NA (informative) Bibliography DIN EN ISO 4788, Laboratory glassware Graduated measuring cylinders DIN EN ISO 28706-1:2011-08, Vitreous and porcelain enamels Dete
12、rmination of resistance to chemical corrosion Part 1: Determination of resistance to chemical corrosion by acids at room temperature (ISO 28706-1:2008) DIN EN ISO 28706-3:2011-08, Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 3: Determination of resistance to
13、chemical corrosion by alkaline liquids using a hexagonal vessel (ISO 28706-3:2008) DIN EN ISO 28706-4:2016-07, Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 4: Determination of resistance to chemical corrosion by alkaline liquids using a cylindrical vessel (IS
14、O 28706-4:2016) DIN EN ISO 28706-5:2011-09, Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 5: Determination of resistance to chemical corrosion in closed systems (ISO 28706-5:2011) DIN EN ISO 28764, Vitreous and porcelain enamels Production of specimens for tes
15、ting enamels on sheet steel, sheet aluminium and cast iron DIN ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) DIN ISO 718, Laboratory glassware Thermal shock and thermal shock endurance Test methods DIN ISO 1629, Rubber and latices Nomen
16、clature DIN ISO 3585, Borosilicate glass 3.3 Properties DIN ISO 3696, Water for analytical laboratory use Specification and test methods DIN EN ISO 28706-2:2017-07 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 28706-2 March 2017 ICS 25.220.50 Supersedes
17、EN ISO 28706-2:2011English Version Vitreous and porcelain enamels - Determination of resistance to chemical corrosion - Part 2: Determination of resistance to chemical corrosion by boiling acids, boiling neutral liquids, alkaline liquids and/or their vapours(ISO 28706-2:2017) maux vitrifis - Dtermin
18、ation de la rsistance la corrosion chimique - Partie 2: Dtermination de la rsistance la corrosion chimique par des acides bouillants, des liquides neutres bouillants, ou des liquides alcalins et/ou leurs vapeurs(ISO 28706-2:2017) Emails und Emaillierungen - Bestimmung der Bestndigkeit gegen chemisch
19、e Korrosion - Teil 2: Bestimmung der Bestndigkeit gegen chemische Korrosion durch kochende Suren, kochende neutrale Flssigkeiten, alkalische Flssigkeiten und/oder deren Dmpfe (ISO 28706-2:2017) This European Standard was approved by CEN on 28 February 2017. CEN members are bound to comply with the C
20、EN/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 application to the CEN-CENELEC Management C
21、entre 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 CEN-CENELEC Management Centre has the same status as
22、the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Neth
23、erlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CE
24、N All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 28706-2:2017 EEuropean foreword .4Introduction .61 Scope . 82 Normative references 83 Terms and definitions . 84 Principle 95 Reagents 96 Apparatus and materials. 106.1 Test apparat
25、us 106.2 Test materials 157 Packing rings . 157.1 General 157.2 Packing A . 157.3 Packing B . 168 Test specimens. 169 Procedure 1610 Expression of results .1710.1 Total loss in mass per unit area . 1710.2 Corrosion rate . 1711 Boiling citric acid 1811.1 General 1811.2 Test solution . 1811.3 Duration
26、 of the test 1811.4 Test report 1812 Boiling sulfuric acid .1812.1 General 1812.2 Test solution . 1812.3 Duration of the test 1912.4 Test report 1913 Boiling hydrochloric acid 1913.1 General 1913.2 Test solution . 1913.3 Duration of the test 1913.4 Test report 2014 Boiling distilled or demineralized
27、 water .2014.1 General 2014.2 Test solution . 2014.3 Duration of the test 2014.4 Test report 2115 Standard detergent solution .2115.1 General 2115.2 Test solution . 2115.3 Test temperature 2215.4 Duration of the test 2215.5 Test report 22Contents PageForeword .5DIN EN ISO 28706-2:2017-07 EN ISO 2870
28、6-2:2017 (E) 2 16.2 Test solution . 2216.3 Duration of the test 2216.4 Test report 23Bibliography .2416 Other test solutions and/or conditions .2216.1 General 22DIN EN ISO 28706-2:2017-07 EN ISO 28706-2:2017 (E)3 European foreword This document (EN ISO 28706-2:2017) has been prepared by Technical Co
29、mmittee ISO/TC 107 “Metallic and other inorganic coatings“ in collaboration with Technical Committee CEN/TC 262 “Metallic and other 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 identi
30、cal text or by endorsement, at the latest by September 2017 and conflicting national standards shall be withdrawn at the latest by September 2017. 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 hel
31、d responsible for identifying any or all such patent rights. This document supersedes EN ISO 28706-2:2011. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cro
32、atia, 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Tur
33、key and the United Kingdom. Endorsement notice The text of ISO 28706-2:2017 has been approved by CEN as EN ISO 28706-2:2017 without any modification. DIN EN ISO 28706-2:2017-07 EN ISO 28706-2:2017 (E) 4 ForewordISO (the International Organization for Standardization) is a worldwide federation of nat
34、ional standards 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. Interna
35、tional organizations, 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.The procedures used to develop this document and those intend
36、ed for its further maintenance are described in the ISO/IEC Directives, 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 .
37、iso .org/ directives).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. Details of any patent rights identified during the development of the document
38、will be in the Introduction and/or on the ISO list of patent declarations 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 voluntary nature of standards, the m
39、eaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by
40、 Technical Committee ISO/TC 107, Metallic and other inorganic coatings.This second edition cancels and replaces the first edition (ISO 28706-2:2008), which has been technically revised with changes as follows. This document can also be used to determine resistance to chemical corrosion using alkalin
41、e liquids. The title of this document has therefore been amended and a section on standard detergent solutions has been included. Additional reagents can be used for testing purposes and these have been included.A list of all parts in the ISO 28706 series can be found on the ISO website.DIN EN ISO 2
42、8706-2:2017-07 EN ISO 28706-2:2017 (E)5 IntroductionCorrosion of vitreous and porcelain enamels by aqueous solutions is a dissolution process. The main component of the enamel, SiO2, forms a three-dimensional silica network. After hydrolysis, it decomposes and forms silicic acid or silicates. These
43、are released into the attacking medium. Other components, mainly metal oxides, are hydrolysed as well and form the corresponding hydrated metal ions or hydroxides. All corrosion products are more or less soluble in the attacking medium. The whole process results in a loss in mass per unit area.For s
44、ome aqueous solutions, the attack on the enamel proceeds linearly during the corrosion time; for other aqueous solutions, the attack on the enamel proceeds in a logarithmic manner during the corrosion time. Only for the first series of solutions can a scientifically exact rate of loss in mass per un
45、it area (g/m2h) be calculated as well as a corrosion rate (millimetres per year).The most important parameters influencing aqueous corrosion of the enamel are the enamel quality, the temperature and the pH value. Inhibition effects resulting from the limited solubility of silica can also contribute.
46、 The following list describes different types of enamel attack for different corrosion conditions.a) In aqueous alkali solutions such as 0,1 mol/l NaOH (see ISO 28706-4:2016, Clause 9), the silica network of the enamel is considerably attacked at 80 C. Silicates and most of the other hydrolysed comp
47、onents are soluble in the alkali. Attack proceeds linearly during regular test times. Therefore, test results are expressed in terms of a rate of loss in mass per unit area (mass loss per unit area and time) and a corrosion rate (millimetres per year).b) At room temperature, in weak aqueous acids su
48、ch as citric acid (see ISO 28706-1:2008, Clause 9) or also in stronger acids such as sulfuric acid (see ISO 28706-1:2008, Clause 10), there is only minor attack on the silica network of the enamel. Other constituents are leached to some extent from the surface. Highly resistant enamels will show no visual change after exposure. On less resistant enamels, some staining or surface roughening will occur
