1、August 2008DEUTSCHE NORM English price group 10No part of this standard 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 77.060!$Q2S“1461548www.
2、din.deDDIN EN ISO 11844-3Corrosion of metals and alloys Classification of low corrosivity of indoor atmospheres Part 3: Measurement of environmental parameters affecting indoorcorrosivity (ISO 11844-3:2006)English version of DIN EN ISO 11844-3:2008-08Korrosion von Metallen und Legierungen Einteilung
3、 der Korrosivitt in Rumen mit geringer Korrosivitt Teil 3: Messung der Umgebungsparameter, die Korrosivitt in Rumen beeinflussen(ISO 11844-3:2006)Englische Fassung DIN EN ISO 11844-3:2008-08www.beuth.deDocument comprises 16 pagesDIN EN ISO 11844-3:2008-08 2 National foreword This standard has been p
4、repared by Technical Committee ISO/TC 156 “Corrosion of metals and alloys” (Secretariat: GOST R (Russian Federation). Based on the results of the unique acceptance procedure, ISO 11844-3:2006 has been adopted by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” (Secretariat: BSI
5、, United Kingdom) as a European Standard. The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Technical Committee NA 062-01-71 AA Korrosion und Korrosions-schutz. The DIN Standards corresponding to the International
6、Standards referred to in clause 2 of the EN are as follows: ISO 7708 DIN ISO 7708 ISO 8502-6 DIN EN ISO 8502-6 ISO 11844-1 DIN EN ISO 11844-1 National Annex NA (informative) Bibliography DIN EN ISO 8502-6, Preparation of steel substrates before application of paints and related products Tests for th
7、e assessment of surface cleanliness Part 6: Extraction of soluble contaminants for analysis The Bresle method DIN EN ISO 11844-1, Corrosion of metals and alloys Classification of low corrosivity of indoor atmospheres Part 1: Determination and estimation of indoor corrosivity DIN ISO 7708, Air qualit
8、y Particle size fraction definitions for health-related sampling EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 11844-3April 2008ICS 77.060English VersionCorrosion of metals and alloys - Classification of low corrosivityof indoor atmospheres - Part 3: Measurement of environmentalparameters af
9、fecting indoor corrosivity (ISO 11844-3:2006)Corrosion des mtaux et alliages - Classification de lacorrosivit faible des atmosphres dintrieur - Partie 3:Mesurage des paramtres environnementaux affectant lacorrosivit des atmosphres dintrieur (ISO 11844-3:2006)Korrosion von Metallen und Legierungen -
10、Einteilung derKorrosivitt in Rumen mit geringer Korrosivitt - Teil 3:Messung der Umgebungsparameter, die Korrosivitt inRumen beeinflussen (ISO 11844-3:2006)This European Standard was approved by CEN on 21 March 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stip
11、ulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard ex
12、ists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bo
13、dies of Austria, Belgium, Bulgaria, 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 United Kingdom.EURO
14、PEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 11844-3:2008: EContents Pag
15、e 2 DIN EN ISO 11844-3:2008-08 EN ISO 11844-3:2008 (E) Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Principle5 4 Environmental parameters .6 5 Humidity and temperature parameters6 5.1 Relative humidity .6 5.2 Temperature .6 5.3 Temperaturehumidity complex 6 6 Airborne gas contamina
16、nts 7 6.1 Principle7 6.2 Placing of measuring equipment .7 6.3 Measuring methods and duration7 7 Airborne particle contaminants. 10 7.1 Principle. 10 7.2 Volumetric measurements. 10 7.3 Measurement of particle deposits. 11 Annex A (informative) Reagents used for both passive and active samplers. 12
17、Bibliography. 14 3 EN ISO 11844-3:2008 (E) DIN EN ISO 11844-3:2008-08 Foreword The text of ISO 11844-3:2006 has been prepared by Technical Committee ISO/TC 156 “Corrosion of metals and alloys” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 11844-3:2008
18、by 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 latest by October 2008, and conflicting nat
19、ional standards shall be withdrawn at the latest by October 2008. 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. According to the CEN
20、/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, L
21、uxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 11844-3:2006 has been approved by CEN as a EN ISO 11844-3:2008 without any modification. Introduction This part of ISO 11844 dea
22、ls with environmental parameters for the characterisation of indoor atmospheres and methods of measurement. The environmental parameters for the characterisation of indoor atmospheres include more airborne contaminants than are normally used for the characterisation of the outdoor environment. Measu
23、rement of environmental parameters is a way of characterising the corrosivity of the indoor atmosphere and will always be required if it is necessary to consider measures for reducing the corrosivity. 4 DIN EN ISO 11844-3:2008-08 EN ISO 11844-3:2008 (E) 1 Scope This part of ISO 11844 describes metho
24、ds for measuring the environmental parameters used to classify the corrosivity of indoor atmospheres on metals and alloys. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undat
25、ed references, the latest edition of the referenced document (including any amendments) applies. ISO 7708:1995, Air quality Particle size fraction definitions for health-related sampling ISO 9225:1992, Corrosion of metals and alloys Corrosivity of atmospheres Measurement of pollution ISO 11844-1, Co
26、rrosion of metals and alloys Classification of low corrosivity of indoor atmospheres Part 1: Determination and estimation of indoor corrosivity EN 12341:1998, Air quality Determination of the PM10fraction of suspended particulate matter Reference method and field test procedure to demonstrate refere
27、nce equivalence of measurement methods 3 Principle Different combinations of parameters affect the corrosivity of indoor atmospheres. Knowledge about possible sources of environmental effects must be obtained before decisions regarding the type of measurements needed are taken. The characterisation
28、of indoor atmospheric corrosivity using environmental parameters is more complicated than measuring the corrosivity with metal specimens. However, in many cases, measurement of environmental parameters can give a good indication of how to establish the corrosivity of an environment and will, in comb
29、ination with the information given in ISO 11844-1, give a good indication of the corrosivity categories for the materials in the selected environment. 5 EN ISO 11844-3:2008 (E) DIN EN ISO 11844-3:2008-08 4 Environmental parameters In indoor atmospheres, corrosion processes are characterised by a mor
30、e complex group of parameters than in outdoor atmospheres. In general, two groups of parameters should be measured: humidity and temperature; airborne contaminants, such as gases and particles. Fluctuation in the temperature and humidity, particularly at higher humidity levels, may cause condensatio
31、n on cooler surfaces. The frequency and time of condensation is an important factor for indoor corrosion. The corrosion effects from these groups of parameters are usually interdependent. A particular level of humidity is needed before corrosion begins, and this can vary for different contaminants.
32、Combinations of contaminants might accelerate the corrosion processes. 5 Humidity and temperature parameters 5.1 Relative humidity Use continuous measuring devices such as hygrographs, thermohygrographs or logging hygrometers. The measuring period is preferably one year, to cover seasonal variations
33、. If shorter measuring periods are needed, select a measuring period where large variations in the relative humidity are expected. The period shall be at least one month per season. The data shall be reported as monthly values. The average, maximum and minimum values for each month shall be reported
34、. The calculation of time with relative humidity in given intervals represents useful information. 5.2 Temperature Use continuous measuring devices such as thermohygrographs or logging thermometers. The measuring period is preferably one year, to cover seasonal variations. If shorter measuring perio
35、ds are needed, select a measuring period where large variations in the temperature are expected. The period shall be at least one month per season. The data shall be reported as monthly values. The average, maximum and minimum values for each month shall be reported. The calculation of time with tem
36、perature in given intervals represents useful information. 5.3 Temperaturehumidity complex Continuous measurements of temperature and humidity give data for the calculation of frequency and time with condensation. 6 DIN EN ISO 11844-3:2008-08 EN ISO 11844-3:2008 (E) 6 Airborne gas contaminants 6.1 P
37、rinciple The gas concentration or deposition can be measured by several techniques: continuous gas-concentration measuring instruments; average gas concentration with an active sampler and air pump; average gas concentration with a passive sampler; average gas-deposition equipment. The results from
38、concentration measurements are typically given in g/m3and for deposition measurements as mg/m2.d. The results obtained from the two types of measurements can be difficult to compare. 6.2 Placing of measuring equipment The corrosivity of the indoor atmosphere may vary dramatically from one point to a
39、nother in a room. Cooler areas may have moisture condensation with a high corrosion effect. Corners often have higher contaminant concentrations and lower air circulation than the rest of the room. If the problem is located in a specific area, measurements shall be performed in that location. If the
40、 problem is more general, then measurements should be made in a central open area in the room. 6.2.1 Continuous gas-measuring instruments The instrument shall be placed so it is protected from unauthorised people. Polyethylene or polytetrafluoroethene (PTFE) tubing can be used to collect the air sam
41、ple from the selected area of the room. The length of the tubing should not exceed 2 m. 6.2.2 Active sampler The active sampler shall be placed according to the same rules as the continuous gas-measuring instrument. 6.2.3 Passive sampler The passive sampler shall be placed in a part of the room wher
42、e there is free movement of air. The sampling device shall be placed with the open end facing downward. 6.2.4 Gas-deposition equipment The equipment shall be placed in a part of the room where there is free movement of air. The equipment shall be sheltered from settling particles that can interfere
43、with the analyses of the gases. 6.3 Measuring methods and duration 6.3.1 Continuous measurement The measurements shall preferably be carried out for one year to record the seasonal variation of the gas pollutants. The data from continuous measuring instruments shall be reported as monthly average va
44、lues, together with the maximum and minimum values of the month. Standard instruments have detection limits in a range from 4 105to 1 106volume fractions. Specially designed instruments may have detection limits of one-tenth of these values. 7 EN ISO 11844-3:2008 (E) DIN EN ISO 11844-3:2008-08 6.3.2
45、 Measurement and calculation with the active sampler The methods are based on pumping air through an absorption unit with a reactive surface or liquid, with subsequent laboratory analysis of the amount absorbed. The result will be given as an average concentration for the sampling period. The sampli
46、ng time shall be one week or longer. The sampling period is preferably one year, or at least one month for each season of the year. With active samplers, the volume of air (V) is known. The average concentration (C) is then mCV= (1) where C is the average concentration, in g/m3; m is the gas absorbe
47、d, in g; V is the air passed through the absorption unit, in m3. The data shall be collected weekly and reported as average weekly values, and converted to average monthly values for four weeks. The maximum and minimum values for the period shall also be reported. NOTE The detection limits for air c
48、oncentrations depend on the sensitivity of the analysing instruments and the duration of the sampling. The normal sensitivity for the instrument is 0,01 g/cm3and weekly mean values with detection limits better than 0,1 g/m3can easily be obtained. 6.3.3 Measurement and calculation with the passive sa
49、mpler Mean gas concentrations can be calculated using passive sampling devices. The principle used for passive sampling is shown in Figure 1. Key 1 absorbent 2 tube 3 permeable screen for gases C1is the ambient concentration of gas C0is the concentration of gas at the absorbent equal zero Figure 1 Principle of construction of a passive-sampling device 8 DIN EN ISO 11844-3:2008-08 EN ISO 11844-3:2008 (E) The basic idea for the use of passive samplers is that Ficks first law for gas diffusion applies ins
