1、June 2014 Translation by DIN-Sprachendienst.English price group 10No 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 7
2、7.060!%2c7“2156420www.din.deDDIN EN ISO 8407Corrosion of metals and alloys Removal of corrosion products from corrosion test specimens(ISO 8407:2009);English version EN ISO 8407:2014,English translation of DIN EN ISO 8407:2014-06Korrosion von Metallen und Legierungen Entfernen von Korrosionsprodukte
3、n von Korrosionsprobekrpern (ISO 8407:2009);Englische Fassung EN ISO 8407:2014,Englische bersetzung von DIN EN ISO 8407:2014-06Corrosion des mtaux et alliages limination des produits de corrosion sur les prouvettes dessai de corrosion(ISO 8407:2009);Version anglaise EN ISO 8407:2014,Traduction angla
4、ise de DIN EN ISO 8407:2014-06www.beuth.deDocument comprises 13 pagesIn case of doubt, the German-language original shall be considered authoritative.05.14 DIN EN ISO 8407:2014-06 2 A comma is used as the decimal marker. National foreword The text of this document (EN ISO 8407:2014) has been prepare
5、d by Technical Committee ISO/TC 156 “Corrosion of metals and alloys” (Secretariat: SAC, China) and has been taken over by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings“ in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). The respo
6、nsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-01-77 AA Korrosionsprfung. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8407 March 2014 ICS 77.060 English Version Corrosion of metals a
7、nd alloys - Removal of corrosion products from corrosion test specimens (ISO 8407:2009) Corrosion des mtaux et alliages - limination des produits de corrosion sur les prouvettes dessai de corrosion (ISO 8407:2009) Korrosion von Metallen und Legierungen - Entfernen von Korrosionsprodukten von Korrosi
8、onsprobekrpern (ISO 8407:2009) 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 the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-dat
9、e 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 official versions (English, French, German). A version in any other language made by translation
10、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 Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Form
11、er 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 United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT
12、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 reserved worldwide for CEN national Members. Ref. No. EN ISO 8407:2014 EDIN EN ISO 8407:2014-06 EN ISO 8407:2014 (
13、E) 2Contents Page Foreword 3 1 Scope 4 2 Procedures . 4 2.1 General 4 2.2 Chemical procedures 6 2.3 Electrolytic procedures . 6 2.4 Mechanical procedures . 6 3 Test report . 6 Annex A (informative) Chemical and electrolytic cleaning procedures for removal of corrosion products . 8 A.1 General 8 A.2
14、Procedures . 8 Foreword The text of ISO 8407:2009 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 8407:2014 by Technical Committee CEN/TC 262 “Metallic and other inorgan
15、ic 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 September 2014, and conflicting national standards shall be withdrawn at the latest by Septemb
16、er 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 responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards org
17、anizations of the following countries are bound to implement this European Standard: 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
18、, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 8407:2009 has been approved by CEN as EN ISO 8407:2014 without any modification. DIN EN ISO 8407:2014-06 EN ISO 8407:2014 (E) 3 W
19、ARNING Safety rules for personnel: handling of the solutions used for removal of corrosion products must be left to skilled personnel or conducted under their control. The equipment must be used and maintained by skilled personnel, not only so that the procedures can be performed correctly, but also
20、 because of the hazards to health and safety that are involved. 1 Scope This International Standard specifies procedures for the removal of corrosion products formed on metal and alloy corrosion test specimens during their exposure in corrosive environments. For the purpose of this International Sta
21、ndard, the term “metals” refers to pure metals and alloys. The specified procedures are designed to remove all corrosion products without significant removal of base metal. This allows an accurate determination of the mass loss of the metal, which occurred during exposure to the corrosive environmen
22、t. These procedures may, in some cases, also be applied to metal coatings. However, possible effects from the substrate must be considered. 2 Procedures 2.1 General 2.1.1 A light mechanical cleaning treatment by brushing with a soft bristle brush under running water should first be applied to remove
23、 lightly adherent or bulky corrosion products. 2.1.2 If the treatment described in 2.1.1 does not remove all corrosion products, it will be necessary to use other procedures. These are of three types: a) chemical; b) electrolytic; c) more vigorous mechanical treatments. NOTE These treatments will al
24、so remove some base metal. Whichever method is used, it might be necessary to repeat the cleaning treatment to ensure complete removal of the corrosion products. Removal shall be confirmed by visual examination. The use of a low-power microscope (i.e. 7 to 30) is particularly helpful with a pitted s
25、urface since corrosion products may accumulate in pits. 2.1.3 An ideal procedure should remove corrosion products and not result in removal of any base metal. Two procedures can be used to confirm this point. One procedure uses a control specimen (2.1.3.1) and the other requires a certain number of
26、cleaning cycles on the corroded specimen (2.1.3.2). DIN EN ISO 8407:2014-06 EN ISO 8407:2014 (E) 4 2.1.3.1 Uncorroded control specimens, which should be similar chemically, metallurgically, and geometrically to the test specimens, should be cleaned by the same procedure as used for the test specimen
27、. By weighing the control specimen before and after cleaning (weighing to the fifth significant figure is suggested, e.g. a 70 g specimen should be weighed to three decimal places), the metal loss resulting from cleaning may be determined. The mass loss of the control specimen will reflect the mass
28、loss of test specimens resulting from the cleaning procedure. 2.1.3.2 The cleaning of each corroded test specimen should be repeated several times after the removal of the corrosion products is completed. The mass shall be plotted as a function of the number of equal cleaning cycles (see Figure 1).
29、Point A represents the mass of corroded specimens before the start of the cleaning. In many cases two straight lines, AB and BC, will be obtained. Line AB characterizes the removal of corrosion products and may not always be visible. Line BC characterizes the removal of substrate after the corrosion
30、 products are gone. Point D, which characterizes the mass of the pure metal at zero number of cleaning cycles, is obtained by extrapolation of line BC to the ordinate axis. In some cases, the relation may not be linear and the most appropriate extrapolation shall then be made. If no intervals of equ
31、al cleaning cycles are used during one cleaning procedure, the x-axis should be expressed in time units. Key X numbers of cleaning cycles or time units Y mass Figure 1 Mass of corroded specimens after repetitive cleaning cycles 2.1.3.3 The true mass of the specimen, after removal of the corrosion pr
32、oducts, will be a value between the masses represented by the points B and D, depending on the degree of protection furnished by the corrosion products during the cleaning procedure. 2.1.4 The preferred cleaning method will be that which a) provides efficient removal of corrosion products, b) provid
33、es low or zero mass loss when applied to new uncorroded specimens (see 2.1.3.1), and c) provides a curve of mass as a function of the number of cleaning cycles or time of pickling, which is close to horizontal when the latter is plotted as the abscissa (see 2.1.3.2). 2.1.5 When chemical or electroly
34、tic procedures are used, solutions freshly prepared with distilled or deionized water and reagent grade chemicals shall be used. 2.1.6 After cleaning, the specimen should be thoroughly rinsed with tap water, a light brushing during this procedure will help to remove any remaining surface products re
35、sulting from the cleaning process. Finally, the DIN EN ISO 8407:2014-06 EN ISO 8407:2014 (E) 5 specimens shall be rinsed with distilled or deionized water. The specimen shall then be rinsed thoroughly in ethanol and dried using a hot air blower or an oven. After that, the specimens shall be allowed
36、to cool in a dessicator to the balance room temperature before weighing. 2.2 Chemical procedures 2.2.1 Chemical procedures involve immersion of the corrosion test specimen in a chemical solution which is specifically designed to remove the corrosion products with minimal dissolution of any base meta
37、l. Several procedures are listed in Annex A (see Table A.1). To facilitate the cleaning, it is strongly recommended to use an ultrasonic bath treatment. 2.2.2 Chemical cleaning is often preceded by light brushing of the test specimen to remove lightly adherent, bulky corrosion products. 2.2.3 Before
38、 the chemical treatment, clean the specimens as described in 2.1.1. In connection with the intermittent removal of specimens for weighing, brush the specimens, if necessary, to facilitate the removal of tightly adherent corrosion products. 2.3 Electrolytic procedures Electrolytic cleaning can also b
39、e used to remove corrosion products. Several methods of electrolytic cleaning of corrosion test specimens are given in Annex A (see Table A.2). To facilitate the cleaning, it is strongly recommended to use an ultrasonic bath treatment. Electrolytic cleaning should be preceded by light brushing of th
40、e test specimen to remove lightly adherent, bulky corrosion products. Brushing should also follow electrolytic cleaning to remove any loose slime or deposits. This will help to minimize any redeposition of metal from reducible corrosion products, which would reduce the mass loss. 2.4 Mechanical proc
41、edures Mechanical procedures can include scraping, scrubbing, brushing, ultrasonic methods, mechanical shock and impact blasting (grit blasting, water-jet blasting, etc.). These methods are often used to remove heavily encrusted corrosion products. Scrubbing with a bristle brush and a mild abrasive/
42、distilled water slurry can also be used to remove corrosion products. Vigorous mechanical cleaning will result in the removal of some base metal, so care should be exercised. These methods should be used only when others fail to provide adequate removal of corrosion products. As with the other metho
43、ds, correction for metal loss due to the cleaning method is recommended. The mechanical forces used in cleaning shall be maintained as constant as possible. 3 Test report The test report shall include the following information: a) a reference to this International Standard; b) the procedure used to
44、remove corrosion products; c) for chemical procedures, the composition and concentration of the chemicals employed or the designation according to Table A.1, the solution temperature and the duration of each cleaning cycle or number of equal cleaning cycles; d) for electrolytic procedures, the compo
45、sition and concentration of chemicals employed or the designation according to Table A.2, the solution temperature, the anode material and current density, and the duration of cleaning; DIN EN ISO 8407:2014-06 EN ISO 8407:2014 (E) 6 e) for mechanical procedures, the specific mechanical method employ
46、ed (bristle-brush scrubbing, wooden scraper, etc.), abrasive compounds used, and the duration of cleaning; f) where multiple procedures are used, the appropriate details for each method and the sequence of methods; g) the results of control cleaning (see 2.1.3.1) or from repetitive cleaning cycles (
47、see 2.1.3.2) designed to assess mass loss from the removal of base metal during the cleaning process; h) the mass loss due to corrosion (see 2.1.3.3). DIN EN ISO 8407:2014-06 EN ISO 8407:2014 (E) 7 Annex A (informative) Chemical and electrolytic cleaning procedures for removal of corrosion products A.1 General In the development of this International Standard, a number of sources were consulted to identify chemical and electrolytic cleaning
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