1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 9223:2012Corrosion of metals and alloys Corrosivity of atmospheres Classification, determination and estimationBS EN ISO 9223:2012 BRITISH STANDARDNational forewordThis
2、 British Standard is the UK implementation of EN ISO 9223:2012. Together with BS EN ISO 9224:2011, BS EN ISO 9225:2011, and BS EN ISO 9226:2011, it supersedes BS EN 12500:2000, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e I S E / N F
3、 E / 8 , C o r r o s i o n o f m e t a l s a n d a l l o y s .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.
4、The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 69028 0 ICS 77.060 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29
5、 February 2012.Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9223 February 2012 ICS 77.060 Supersedes EN 12500:2000English Version Corrosion of metals and alloys - Corrosivity of atmospheres - Classification, determination and
6、 estimation (ISO 9223:2012) Corrosion des mtaux et alliages - Corrosivit des atmosphres - Classification, dtermination et estimation (ISO 9223:2012) Korrosion von Metallen und Legierungen - Korrosivitt von Atmosphren - Klassifizierung, Bestimmung und Abschtzung (ISO 9223:2012) This European Standard
7、 was approved by CEN on 22 January 2012. 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 suc
8、h 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 its own
9、 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, Italy
10、, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17,
11、 B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 9223:2012: EBS EN ISO 9223:2012 EN ISO 9223:2012 (E) 3 Foreword This document (EN ISO 9223:2012) has been prepared by Technical Committee ISO/TC 156 “Corrosi
12、on of metals and alloys“ 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 identical text or by endorsement, at the
13、 latest by August 2012, and conflicting national standards shall be withdrawn at the latest by August 2012. 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 al
14、l such patent rights. This document supersedes EN 12500:2000. 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, Croatia, Cyprus, Czech Republic, Denmark, Estoni
15、a, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, 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 9223:2012 has been approved b
16、y CEN as a EN ISO 9223:2012 without any modification. BS EN ISO 9223:2012ISO 9223:2012(E) ISO 2012 All rights reserved iiiContents Page Foreword iv Introduction . v 1 Scope 1 2 Normative references 1 3 Terms and definitions . 2 4 Symbols and abbreviated terms 2 4.1 Symbols 2 4.2 Abbreviated terms .
17、3 5 Category of corrosivity of the atmosphere . 3 6 Classification of corrosivity of the atmosphere . 3 7 Corrosivity determination based on corrosion rate measurement of standard specimens . 4 8 Corrosivity estimation based on environmental information . 4 8.1 Corrosivity estimation General . 4 8.2
18、 Normative corrosivity estimation based on calculated first-year corrosion losses 5 8.3 Informative corrosivity estimation based on description of exposure conditions 6 Annex A (informative) Sources of uncertainty associated with the determination and estimation of atmospheric corrosivity 7 Annex B
19、(informative) Characterization of the atmosphere in relation to its corrosivity 9 Annex C (informative) Description of typical atmospheric environments related to the estimation of corrosivity categories . 13 Bibliography 15 BS EN ISO 9223:2012ISO 9223:2012(E) iv ISO 2012 All rights reservedForeword
20、 ISO (the International Organization for Standardization) is a worldwide federation of national 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
21、 committee has been established has the right to be represented on that committee. International 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 elec
22、trotechnical standardization. International Standards are drafted in accordance with the rules given in 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
23、 member bodies for voting. Publication as an International Standard requires approval by at least 75 % 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 iden
24、tifying any or all such patent rights. ISO 9223 was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys. This second edition cancels and replaces the first edition (ISO 9223:1992), which has been technically revised. BS EN ISO 9223:2012ISO 9223:2012(E) ISO 2012 All rights rese
25、rved vIntroduction Metals, alloys and metallic coatings can suffer atmospheric corrosion when their surfaces are wetted. The nature and rate of the attack depends upon the properties of surface-formed electrolytes, particularly with regard to the level and type of gaseous and particulate pollutants
26、in the atmosphere and to the duration of their action on the metallic surface. The character of the corrosion attack and the corrosion rate are consequences of the corrosion system, which comprises the metallic materials, the atmospheric environment, technical parameters and operation conditions. Th
27、e corrosivity category is a technical characteristic which provides a basis for the selection of materials and protective measures in atmospheric environments subject to the demands of the specific application, particularly with regard to service life. Data on the corrosivity of the atmosphere are e
28、ssential for the development and specification of optimized corrosion protection for manufactured products. The corrosivity categories are defined by the first-year corrosion effects on standard specimens as specified in ISO 9226. The corrosivity categories can be assessed in terms of the most signi
29、ficant atmospheric factors influencing the corrosion of metals and alloys. The measurement of relevant environmental parameters is specified in ISO 9225. The ways of determining and estimating the corrosivity category of a given location according to this International Standard and the relationships
30、 among them are presented in Figure 1. It is necessary to distinguish between corrosivity determination and corrosivity estimation. It is also necessary to distinguish between corrosivity estimation based on application of a dose-response function and that based on comparison with the description of
31、 typical atmospheric environments. This International Standard does not take into consideration the design and mode of operation of the product, which can influence its corrosion resistance, since these effects are highly specific and cannot be generalized. Steps in the choice of optimized corrosion
32、 protection measures in atmospheric environments are defined in ISO 11303. BS EN ISO 9223:2012ISO 9223:2012(E) vi ISO 2012 All rights reservedFigure 1 Classification of atmospheric corrosivity BS EN ISO 9223:2012INTERNATIONAL STANDARD ISO 9223:2012(E) ISO 2012 All rights reserved 1Corrosion of metal
33、s and alloys Corrosivity of atmospheres Classification, determination and estimation 1 Scope This International Standard establishes a classification system for the corrosivity of atmospheric environments. It defines corrosivity categories for the atmospheric environments by the first-year corrosion
34、 rate of standard specimens, gives dose-response functions for normative estimation of the corrosivity category based on the calculated first-year corrosion loss of standard metals, and makes possible an informative estimation of the corrosivity category based on knowledge of the local environmental
35、 situation. This International Standard specifies the key factors in the atmospheric corrosion of metals and alloys. These are the temperature-humidity complex, pollution by sulfur dioxide and airborne salinity. Temperature is also considered an important factor for corrosion in areas outside the te
36、mperate macroclimatic zone. The temperature-humidity complex can be evaluated in terms of time of wetness. Corrosion effects of other pollutants (ozone, nitrogen oxides, particulates) can influence the corrosivity and the evaluated one-year corrosion loss, but these factors are not considered decisi
37、ve in the assessment of corrosivity according to this International Standard. This International Standard does not characterize the corrosivity of specific service atmospheres, e.g. atmospheres in chemical or metallurgical industries. The classified corrosivity categories and introduced pollution le
38、vels can be directly used for technical and economical analyses of corrosion damage and for a rational choice of corrosion protection measures. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cit
39、ed applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 8044, Corrosion of metals and alloys Basic terms and definitions ISO 9224, Corrosion of metals and alloys Corrosivity of atmospheres Guiding values for the corrosivity categories
40、 ISO 11844-1, Corrosion of metals and alloys Classification of low corrosivity of indoor atmospheres Part 1: Determination and estimation of indoor corrosivity ISO 11844-2, Corrosion of metals and alloys Classification of low corrosivity of indoor atmospheres Part 2: Determination of corrosion attac
41、k in indoor atmospheres BS EN ISO 9223:2012ISO 9223:2012(E) 2 ISO 2012 All rights reservedISO 11844-3, Corrosion of metals and alloys Classification of low corrosivity of indoor atmospheres Part 3: Measurement of environmental parameters affecting indoor corrosivity 3 Terms and definitions For the p
42、urposes of this document, the terms and definitions given in ISO 8044 and the following apply. 3.1 corrosivity of atmosphere ability of the atmosphere to cause corrosion in a given corrosion system 3.2 category of corrosivity of atmosphere standardized rating of corrosivity of atmosphere in relation
43、 to the one-year corrosion effect 3.3 type of atmosphere characterization of the atmosphere on the basis of appropriate classification criteria other than corrosivity or of complementary operation factors EXAMPLE Rural, urban, industrial, marine, chemical, etc. 3.4 temperature-humidity complex combi
44、ned effect of temperature and relative humidity on the corrosivity of the atmosphere 3.5 time of wetness period when a metallic surface is covered by adsorptive and/or liquid films of electrolyte to be capable of causing atmospheric corrosion 3.6 pollution level numbered rank based on quantitative m
45、easurements of specific chemically active substances, corrosive gases or suspended particles in the air (both natural and the result of human activity) that are different from the normal components of the air 3.7 category of location conventionally defined typical exposure conditions of a component
46、or structure EXAMPLE Exposure in the open air, under shelter, in a closed space, etc. 3.8 dose-response function relationship derived from results of field tests for calculation of corrosion loss from average values of environmental parameters 4 Symbols and abbreviated terms 4.1 Symbols rcorrCorrosi
47、on rate for the first year of atmospheric exposure T Air temperature BS EN ISO 9223:2012ISO 9223:2012(E) ISO 2012 All rights reserved 3PdSO2deposition rate PcSO2concentration SdCldeposition rate Time of wetness 4.2 Abbreviated terms C Atmospheric corrosivity category RH Relative humidity 5 Category
48、of corrosivity of the atmosphere The corrosivity of the atmosphere is divided into six categories (see Table 1). Table 1 Categories of corrosivity of the atmosphere Category Corrosivity C1 Very lowC2 Low C3 MediumC4 High C5 Very high CX Extreme 6 Classification of corrosivity of the atmosphere The c
49、orrosivity of atmospheric environments shall be classified either by determination of the corrosivity in accordance with Clause 7 or, where this is not possible, by estimation of the corrosivity in accordance with Clause 8. Both methods of the corrosivity evaluation represent a generalized approach and are characterized by some uncertainties and limitations. A corrosivity category determined from the first-year corrosion loss reflects the specific environmental situation of the year of exposure. A
