1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 9225:2012Corrosion of metals andalloys Corrosivity ofatmospheres Measurementof environmental parametersaffecting corrosivity ofatmospheres (ISO 9225:2012)BS EN ISO 9225
2、:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 9225:2012. Together with BS EN ISO 9223:2011, BS EN ISO 9224:2011, and BS EN ISO 9226:2011, it supersedes BS EN 12500:2000, which is withdrawn.The UK participation in its preparation was entrusted to T e
3、c h n i c a l C o m m i t t e e I S E / N F 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 ar
4、e responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 69030 3 ICS 77.060 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the St
5、andards Policy and Strategy Committee on 29 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 9225 February 2012 ICS 77.060 Supersedes EN 12500:2000English Version Corrosion of metals and alloys - Corrosivity of atmo
6、spheres - Measurement of environmental parameters affecting corrosivity of atmospheres (ISO 9225:2012) Corrosion des mtaux et alliages - Corrosivit des atmosphres - Mesurage des paramtres environnementaux affectant la corrosivit des atmosphres (ISO 9225:2012) Korrosion von Metallen und Legierungen -
7、 Korrosivitt von Atmosphren - Messung der die Korrosivitt von Atmosphren beeinflussenden Umweltparameter (ISO 9225:2012) This European Standard 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
8、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 Centre or to any CEN member. This European Standard exists in three officia
9、l 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 the official versions. CEN members are the national standards bodies of Au
10、stria, 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, Turkey and United Kin
11、gdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, 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 9225:2012: EBS
12、 EN ISO 9225:2012 EN ISO 9225:2012 (E) 3 Foreword This document (EN ISO 9225:2012) has been prepared by Technical Committee ISO/TC 156 “Corrosion 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
13、. 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 August 2012, and conflicting national standards shall be withdrawn at the latest by August 2012. Attention is drawn to the possibility that some o
14、f 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 12500:2000. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
15、following countries are bound to implement this European Standard: Austria, 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,
16、Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 9225:2012 has been approved by CEN as a EN ISO 9225:2012 without any modification. BS EN ISO 9225:2012ISO 9225:2012(E) ISO 2012 All rights reserved iiiContents Page Foreword iv Introduct
17、ion . v 1 Scope 1 2 Normative references 1 3 Principle . 1 4 Humidity and temperature parameters . 2 4.1 Relative humidity . 2 4.2 Temperature . 2 5 Airborne contaminants . 2 5.1 Principle . 2 5.2 Placement of measurement equipment 3 5.3 Measurement methods and duration 3 Annex A (normative) Determi
18、nation of sulfur dioxide deposition rate on lead dioxide sulfation plates 6 Annex B (normative) Determination of sulfur dioxide deposition rate on lead dioxide sulfation cylinder . 9 Annex C (normative) Determination of sulfur dioxide deposition rate on alkaline surfaces 12 Annex D (normative) Deter
19、mination of chloride deposition rate by the wet candle method 14 Annex E (normative) Determination of chloride deposition rate by dry plate method 18 Annex F (normative) Comparison of chlorides and sulfur dioxide deposition rates determined by different methods 21 Bibliography 22 BS EN ISO 9225:2012
20、ISO 9225:2012(E) iv ISO 2012 All rights reservedForeword 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 m
21、ember 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 liaison with ISO, also take part in the work. ISO collaborates closely with the International
22、Electrotechnical Commission (IEC) on all matters of electrotechnical 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 a
23、dopted by the technical committees are circulated to the 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 p
24、atent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 9225 was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys. This second edition cancels and replaces the first edition (ISO 9225:1992), which has been technically revised. BS E
25、N ISO 9225:2012ISO 9225:2012(E) ISO 2012 All rights reserved vIntroduction The ability of an atmosphere to cause corrosion of metals and alloys is controlled by the following factors: the temperature-humidity complex and pollution. A basic requirement for the estimation of the corrosivity of atmosph
26、eres is standardized measurement of the important parameters describing the correlation between the corrosion and the environmental characteristics. The methods included in this International Standard have been chosen for their easy applicability and good comparability of results. It is important to
27、 stress that the methods for estimation of the atmospheric corrosivity given in ISO 9223 are based on the measurement methods described in this International Standard. BS EN ISO 9225:2012BS EN ISO 9225:2012INTERNATIONAL STANDARD ISO 9225:2012(E) ISO 2012 All rights reserved 1Corrosion of metals and
28、alloys Corrosivity of atmospheres Measurement of environmental parameters affecting corrosivity of atmospheres WARNING Some of the procedures included in this International Standard entail the use of potentially hazardous chemicals. lt is emphasized that all appropriate safety precautions should be
29、taken. 1 Scope This International Standard specifies methods for measuring the parameters needed for corrosivity estimation used for classification of the corrosivity of atmospheres in ISO 9223. This International Standard specifies methods for the measurement of environmental parameters for normati
30、ve corrosivity estimation based on calculated first-year corrosion rates of standard metals, and informative corrosivity estimation based on characterization of the exposure environment. This International Standard does not describe the usual analytical techniques for the measured parameters since t
31、his depends on the available analytical techniques used in laboratories. Specific methods for deposition measurement of SO2and Cldeposition rates and conversional factors for comparison of different measuring methods are presented in Annexes A, B, C, D, E and F. For methods pertaining to the charact
32、erization of the atmospheric exposure site in general, see ISO 8565. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced do
33、cument (including any amendments) applies. ISO 9223, Corrosion of metals and alloys Corrosivity of atmospheres Classification, determination and estimation ISO 11844-3, Corrosion of metals and alloys Classification of low corrosivity of indoor atmospheres Part 3: Measurement of environmental paramet
34、ers affecting indoor corrosivity 3 Principle Different environmental parameters and their combinations affect the corrosivity of the atmosphere. Two methods for corrosivity estimation (normative and informative) are specified in ISO 9223. In general, two groups of parameters are obtained or measured
35、 for standardized procedures of corrosivity estimation: humidity and temperature; airborne contaminants. BS EN ISO 9225:2012ISO 9225:2012(E) 2 ISO 2012 All rights reservedStandardized corrosivity estimation is based on information on levels of the dominating environmental parameters: the temperature
36、-humidity complex, and pollution with SO2and airborne chlorides. Measurements of these parameters are mandatory for the purpose of corrosivity estimation. Contaminants other than SO2and Cl, such as NOx, O3, H2S, HNO3, can also exert an effect on the corrosion rate. Corrosion active components of dus
37、t deposits (SO42, NO3, Cl) react with metals in the presence of humidity. These factors are considered as accompanying factors (see ISO 9223). These environmental parameters, which contribute to the effect on corrosion of standard metals in multi-pollutant situations, are not included as mandatory p
38、arameters for corrosivity estimation in ISO 9223. Information on levels of these parameters can help in informative corrosivity estimation. Methods for the measurement of environmental parameters to be used specifically for the estimation of low corrosivity of indoor atmospheres (IC) are given in IS
39、O 11844-3. 4 Humidity and temperature parameters 4.1 Relative humidity Reliable long-term average values for relative humidity can often be obtained from the meteorological authorities in the country. Several types of measuring devices can be used if collection of new data for the locality is needed
40、. There are several continuous measuring devices, such as hygrographs, thermohygrographs or logging hygrometers, available on the market. The period of measurement is preferably one year in order to cover seasonal variations and because the classification system is based on yearly average values. Th
41、e data shall be expressed as yearly mean values. 4.2 Temperature Reliable long-term average values for temperature can often be obtained from the meteorological authorities in the country. Several types of measuring devices can be used if collection of new data for the locality is needed. There are
42、several continuous measuring devices, such as thermohygrographs or logging thermometers, available on the market. The period of measurement is preferably one year in order to cover seasonal variations and because the classification system is based on yearly average values. The data shall be expresse
43、d as yearly mean values. 5 Airborne contaminants 5.1 Principle The gas concentration or deposition rate may be measured using several techniques: continuous gas concentration measuring instruments; average gas concentration with active sampler and air pump; average gas concentration with diffusive (
44、passive) sampler; average deposition rate equipment. The results from concentration measurements are typically given in micrograms per cubic metre (g/m3) and, for deposition measurements, in milligrams per square metre per day mg/(m2d). BS EN ISO 9225:2012ISO 9225:2012(E) ISO 2012 All rights reserve
45、d 35.2 Placement of measurement equipment 5.2.1 Continuous gas concentration measurement instruments The instrument shall be located in a place that is sheltered from the rain and protected from unauthorized people. Preferably, the instrument should be placed indoors with a tube leading out to the a
46、mbient air. Polyethylene or PTFE tubing is recommended and the length of the tubing should not exceed 2 m. The inlet shall be facing down with a wider hood at the inlet to reduce the risk of sucking particulates into the tube. 5.2.2 Measurement instruments with active sampler The active sampler equi
47、pment shall be placed according to the same rules as the continuous gas-measuring instrument. 5.2.3 Measurement instruments with diffusive sampler The sampling device shall be placed with the open end facing downward under appropriate shelter. The air flow influences the gas diffusion in the sampler
48、. 5.2.4 Deposition rate equipment The equipment shall be sheltered from setting particles and from washing out by rain for outdoor deposition measurements. The air flow influences the deposition rate. 5.3 Measurement methods and duration 5.3.1 Continuous measurement The measurements shall preferably
49、 be carried out for one year in order to record the seasonal variation of the gas pollutants. The data from continuous measuring instruments shall be recorded as monthly average values. For the corrosivity estimation, the data shall be expressed as yearly mean values. Standard instruments have detection limits in a range from 4 105volume fractions to 1 106volume fractions. 5.3.2 Measurement with active sampler The methods are based on pumping air through an absorption unit with a reactive su
