DIN EN ISO 11474-2014 Corrosion of metals and alloys - Corrosion tests in artificial atmosphere - Accelerated outdoor test by intermittent spraying of a salt solution (Scab test) (.pdf

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1、June 2014 Translation by DIN-Sprachendienst.English price group 8No 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 77

2、.060!%2m“2157427www.din.deDDIN EN ISO 11474Corrosion of metals and alloys Corrosion tests in artificial atmosphere Accelerated outdoor test by intermittent spraying of a salt solution(Scab test) (ISO 11474:1998);English version EN ISO 11474:2014,English translation of DIN EN ISO 11474:2014-06Korrosi

3、on von Metallen und Legierungen Korrosionsprfung in knstlicher Atmosphre Beschleunigte Auenbewitterung (Freibewitterung) mit intermittierendem Sprhen einerSalzlsung (SCAB-Test) (ISO 11474:1998);Englische Fassung EN ISO 11474:2014,Englische bersetzung von DIN EN ISO 11474:2014-06Corrosion des mtaux e

4、t alliages Essais de corrosion en atmosphre artificielle Essai de corrosion acclr en extrieur par vaporisation intermittente dun brouillard salin(Scab test) (ISO 11474:1998);Version anglaise EN ISO 11474:2014,Traduction anglaise de DIN EN ISO 11474:2014-06www.beuth.deDocument comprises 12 pagesIn ca

5、se of doubt, the German-language original shall be considered authoritative.05.14 DIN EN ISO 11474:2014-06 2 A comma is used as the decimal marker. National foreword This standard (ISO 11474:1998) has been prepared by Technical Committee ISO/TC 156 “Corrosion of metals and alloys” (Secretariat: SAC,

6、 China) and has been taken over as EN ISO 11474:2014 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), W

7、orking Committee NA 062-01-77 AA Korrosionssprfung. The Working Committee brings attention to the fact that the term “Scab test” used in the title can also be used in the more general sense of testing underfilm corrosion, and not only where stone shots have caused damage to car surfaces, as is expla

8、ined in the Introduction to the International Standard. This form of corrosion does not occur during the salt spray test, for example. Furthermore, attention is brought to the fact that, normally, the procedure described in Clause 6 is carried out for at least 12 months to take account of the differ

9、ent effects occurring throughout the year. Not only does the testing period have an influence on the result, but so does the exposure period. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 2810 DIN EN ISO 2810 ISO 8407 DIN EN ISO 8407

10、ISO 8565 DIN EN ISO 8565 ISO 9226 DIN EN ISO 9226 National Annex NA (informative) Bibliography DIN EN ISO 55665, Paints and varnishes Natural weathering of coatings Determination of corrosion protection performance DIN EN ISO 2810, Paints and varnishes Natural weathering of coatings Exposure and ass

11、essment DIN EN ISO 8407, Corrosion of metals and alloys Removal of corrosion products from corrosion test specimens DIN EN ISO 8565, Metals and alloys Atmospheric corrosion testing General requirements DIN EN ISO 9226, Corrosion of metals and alloys Corrosivity of atmospheres Determination of corros

12、ion rate of standard specimens for the evaluation of corrosivity EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 11474 March 2014 ICS 77.060 English Version Corrosion of metals and alloys - Corrosion tests in artificial atmosphere - Accelerated outdoor test by intermittent spraying of a sal

13、t solution (Scab test) (ISO 11474:1998) Corrosion des mtaux et alliages - Essais de corrosion en atmosphre artificielle - Essai de corrosion acclr en extrieur par vaporisation intermittente dun brouillard salin (Scab test) (ISO 11474:1998) Korrosion von Metallen und Legierungen - Korrosionsprfung in

14、 knstlicher Atmosphre - Beschleunigte Auenbewitterung (Freibewitterung) mit intermittierendem Sprhen einer Salzlsung (Scab-Test) (ISO 11474:1998) This European Standard was approved by CEN on 9 February 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate t

15、he 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 Centre or to any CEN member. This European Standar

16、d 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 the official versions. CEN members are the nation

17、al 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, Netherlands, Norway, Poland, Portugal, Romania, Slova

18、kia, 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 2014 CEN All rights of exploitation in any form and by any means

19、 reserved worldwide for CEN national Members. Ref. No. EN ISO 11474:2014 EDIN EN ISO 11474:2014-06 EN ISO 11474:2014 (E) 2Contents Page Foreword . 3 Introduction 4 1 Scope . 5 2 Normative references . 5 3 Reagents 6 4 Apparatus 6 5 Test specimens . 6 6 Procedure 7 7 Characterization of the exposure

20、site 7 8 Measurement of corrosivity at exposure site 8 9 Test report . 9 Annex A (informative) Procedures for the removal of corrosion products 10 Foreword The text of ISO 11474:1998 has been prepared by Technical Committee ISO/TC 156 “Corrosion of metals and alloys” of the International Organizatio

21、n for Standardization (ISO) and has been taken over as EN ISO 11474:2014 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 t

22、ext or by endorsement, at the latest by September 2014, and conflicting national standards shall be withdrawn at the latest by September 2014. 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 re

23、sponsible for identifying any or all such patent rights. 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, Estonia, Fi

24、nland, 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, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of

25、 ISO 11474:1998 has been approved by CEN as EN ISO 11474:2014 without any modification. DIN EN ISO 11474:2014-06 EN ISO 11474:2014 (E) 3 IntroductionCorrosion testing under atmospheric exposure conditions is mostcommonly executed as field tests. As the corrosion rate depends on theenvironment of the

26、 test site, the latter should ideally be selected to bestrepresent the environments in which the material is likely to be used. Theresults of field tests cannot therefore be used to predict serviceperformance exactly but they do provide the best guidance to serviceperformance. Field tests, however,

27、may require exposure periodscorresponding to the expected service life of a material.To promote corrosion and accelerate the degradation process, test siteswith a high atmospheric corrosivity can be used. Such test sites may belocated in marine environments or in highly polluted industrial areas. To

28、increase the corrosion rate at other test sites, artificial measures need tobe adopted. In the method described, the corrosion process during outdoorexposure is accelerated by intermittently spraying a solution of sodiumchloride (mass fraction 3 %) on to the test surface thus simulating andenhancing

29、 the environmental stress prevailing at marine test sites. Themethod is mainly intended for comparative testing and one or morereference materials are therefore always necessary. The results obtaineddo not permit any more far-reaching conclusions on the corrosionresistance of the tested metal in all

30、 environments in which it may be used.The method described can nevertheless give valuable information on therelative performance of materials in service.NOTE The title of this International Standard presents (within parentheses) acommon name for this kind of test. Hitherto, “scab test” has been used

31、 mainly in anarrower sense to denote similar test methods developed within the car industryfor the study of underfilm corrosion, particularly where painted steel surfaces havebeen locally damaged by stone shots. The word “scab” is no acronym. It simplyrefers to a well-known but not very pleasant dis

32、ease and its symptom, i.e. a kind ofcrusty spots on the skin. In this International Standard, the same name is used in awider sense to denote a test method which is applicable to all kinds of metallicsubstrate with or without coating. Some of these substrates will show a scab-likeappearance after be

33、ing tested. Others will not.DIN EN ISO 11474:2014-06 EN ISO 11474:2014 (E) 4 1 ScopeThe purpose of this International Standard is to define a method of assessing the corrosion resistance of metals byan accelerated outdoor corrosion test.In this International Standard, the term “metal” includes metal

34、lic materials with or without corrosion protection.The accelerated outdoor corrosion test applies to organic coatings on metals; metallic coatings (anodic and cathodic); chemical conversion coatings; metals and their alloys.The method is especially suitable for comparative testing in the optimizatio

35、n of surface treatment systems.2 Normative referencesThe following standards contain provisions which, through reference in this text, constitute provisions of thisInternational Standard. At the time of publication, the editions indicated were valid. All standards are subject torevision, and parties

36、 to agreements based on this International Standard are encouraged to investigate thepossibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintainregisters of currently valid International Standards.ISO 2810:1), Paints and varnishes Notes for guid

37、ance on the conduct of natural weathering tests.ISO 8407:1991, Corrosion of metals and alloys Removal of corrosion products from corrosion test specimens.ISO 8565:1992, Metals and alloys Atmospheric corrosion testing General requirements for field tests.ISO 9226:1992, Corrosion of metals and alloys

38、Corrosivity of atmospheres Determination of corrosion rate ofstandard specimens for the evaluation of corrosivity._1) To be published. (Revision of ISO 2810:1974)DIN EN ISO 11474:2014-06 EN ISO 11474:2014 (E) 5 3 ReagentsSalt solution, prepared by dissolving a sufficient mass of sodium chloride in d

39、istilled or deionized water to aconcentration of 30 g/l 1 g/l. The distilled or deionized water used shall have a conductivity not higher than2 mS/m at 25 C 2 C.The maximum permissible amounts of impurities in the sodium chloride are given in table 1.Prior to use, check the pH of the salt solution b

40、y using electrometric measurement at 25 C 2 C or in routinechecks, with a short range pH paper which can be read in increments of 0,3 pH units or less. If the pH valuedetermined is outside the range 6,0 to 7,0 adjustments are to be made by adding to the alt solution dilutedhydrochloric acid or sodiu

41、m hydroxide of analytical grade.Table 1 Impurity by Max mass fraction of impurity%MethodCopper 0,001 Determined by spectrophotometry or other method ofsimilar accuracyNickel 0,001 Determined by spectrophotometry or other method ofsimilar accuracySodium iodide 0,1 Calculated for dry saltTotal 0,5 Cal

42、culated for dry salt4 Apparatus4.1 Spray bottle, capable of producing a finely distributed mist.4.2 Exposure frames, for holding the test specimens in an appropriate position.The frames shall be designed in accordance with the requirements of ISO 8565. They shall normally hold the testspecimens at a

43、n angle 45 to the horizontal plane and face the equator. Other exposure angles and orientationsmay also be agreed upon. The frames shall be located so that the test specimens are neither protected nor shadedby nearby objects.The frames shall be positioned so that the reverse sides of the test specim

44、ens are freely exposed to air and so thatno water runs off from one test specimen to another. During exposure, the test specimens shall not be in directcontact with metallic parts and, if possible, not in contact with wood or other porous materials. If the test specimensare set in tracks, suitable d

45、rainage holes shall be made to prevent water collection.The frames shall be positioned so that all test specimens are at least 0,75 m above ground level.5 Test specimensTest specimens (of the material to be tested for corrosion resistance) shall be prepared according to the generalrequirements given

46、 in ISO 8565. The simplest and most common type of test specimen is a flat panel, but valuableinformation can also be obtained by carrying out tests on structures. Structures which encase water may show earlydamage.For each series of test specimens, data records shall be kept including the following

47、 information.a) Specification of material to be tested. For surface treated materials: type of base material, its pretreatment, typeof coating, method of application and dry coat thickness.DIN EN ISO 11474:2014-06 EN ISO 11474:2014 (E) 6 b) If the test specimen is subjected to intentional damage in the coating the shape and the location of the damageshould be described, as well as how the damage was achieved.c) Any special requirements concer