BS EN ISO 8407-2014 Corrosion of metals and alloys Removal of corrosion products from corrosion test specimens《金属和合金的腐蚀 从腐蚀试验样本中去除腐蚀产品》.pdf

1、ICS77.060NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWBRITISHSTANDARDCorrosionofmetalsandalloysRemovalofcorrosionproductsfromcorrosiontestspecimensBS EN ISO 8407:2014Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo rep

2、roduction or networking permitted without license from IHS-,-,-National forewordThis British Standard is the UK implementation of EN ISO 8407:2014. It is identical to ISO 8407:2009. It supersedes BS ISO 8407:2009 which is withdrawn.The UK participation in its preparation was entrusted to Technical C

3、ommittee ISE/NFE/8, Corrosion of metals and alloys.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.Compliance w

4、ith a British Standard cannot confer immunity from legal obligations.BS EN ISO 8407:2014This British Standardwas published underthe authority of theStandards Policy andStrategy Committee on 30November 2009Amendments/corrigenda issued since publicationDate Comments 30 April 2014 This corrigendum renu

5、mbers BS ISO 8407:2009 as BS EN ISO 8407:2014ISBN 978 0 580 82057 1 The British Standards Institution 2014. Published by BSI Standards Limited 2014Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted

6、without license from IHS-,-,-EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8407 March 2014 ICS 77.060 English Version Corrosion of metals and alloys - Removal of corrosion products from corrosion test specimens (ISO 8407:2009) Corrosion des mtaux et alliages - limination des produits de c

7、orrosion sur les prouvettes dessai de corrosion (ISO 8407:2009) Korrosion von Metallen und Legierungen - Entfernen von Korrosionsprodukten von Korrosionsprobekrpern (ISO 8407:2009) This European Standard was approved by CEN on 9 February 2014. CEN members are bound to comply with the CEN/CENELEC Int

8、ernal 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 such national standards may be obtained on application to the CEN-CENELEC Management Centre or to an

9、y 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 language and notified to the CEN-CENELEC Management Centre has the same status as the official v

10、ersions. CEN members are the national 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, Norwa

11、y, Poland, Portugal, Romania, Slovakia, 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 exploi

12、tation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 8407:2014 ECopyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ii ISO 200

13、9 All rights reservedForeword 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 i

14、norganic 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 S

15、eptember 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 standar

16、ds organizations 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, Luxe

17、mbourg, 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. BS EN ISO 8407:2014 8407:2014 (E)EN ISO Co

18、pyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-INTERNATIONAL STANDA RD ISO 2009 All rights reserved 1Corrosion of metals and alloys Removal of corrosion products from

19、corrosion test specimens WARNING Safety rules for personnel: handling of the solutions used for removal of corrosionproducts must be left to skilled personnel or conducted under their control. The equipment mustbeused and maintained by skilled personnel, not only so that the procedures can be perfor

20、med correctly, but also 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 andalloy corrosion test speci mens during their exposure in corros ive environments. For the purpos e

21、of thisInternational Standard, the term “metals” refers to pure metals and alloys. The specified proceduresare 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 toth

22、e corrosive environment.These procedures may, in some cases, also be applied to metal coatings. However, possible effectsfrom the substrate must be considered. 2 Procedures2.1 General 2.1.1 A light mechanical cleaning treatment by brushingwith a soft bristle brush under running water should first be

23、 applied to remove lightlyadherent or bulky corrosion products. 2.1.2 If the treatment described in 2.1.1 does not remove all corrosion products, it willbe necessary to use other procedures. These are of three types:a) chemical; b) electrolytic; c) more vigorous mechanical treatments.NOTE These trea

24、tments will also remove some base metal. Whichever method is used, it might be necessary to repeat the cleaning treatment to ensure completeremoval of the corrosion products. Removal shall be confirmed by visual examination. The use of a low-powermicroscope (i.e. 7 to 30) is particularly helpful wit

25、h a pitted surface 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 theother requires a certain

26、 number ofcleaning cycles onthe corroded specimen (2.1.3.2).BS EN ISO 8407:2014 ISO 8407:2009 (E)Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-2 ISO 2009 All rights

27、 reserved2.1.3.1 Uncorroded control specimens, which s hould be similar chemically, metallurgically, andgeometrically to the test specimens, should be cleaned by the same procedure as used for the test specimen. By weighing the control specimen before and after cleaning (weighing to the fifth signif

28、icant figure issuggested, e.g. a 70 g specimen should be weighed to three decimal places), the metal loss resulting from cleaning may be determined. The mas s loss of the control specimen will reflect the mass loss of testspecimens resulting from the cleaning procedure. 2.1.3.2 The cleaning of each

29、corroded test specimen should be repeated several times after the removalof the corrosion productsis completed. The mass shall be plotted as a function of the number of equal cleaning cycles (see Figure1). Point A represents the mass of corroded specimens before the start of thecleaning. In many cas

30、es two straight lines, AB and BC, will be obtained. Line AB characterizes the removal ofcorrosion products and maynot always be visible. Line BC characterizes the removal of substrate after thecorrosion products are gone. Point D, which characterizes the mass of the pure metal at zeronumber of clean

31、ing cycles, is obtained by ex trapolation of line BC to the ordinate axis. In some cases, the relation m ay not be linear and the most appropriate extrapolation shall then be made. If no intervals of equal cleaning cycles are used during one cleaning procedure, the x-axis should beexpressed in time

32、units. KeyX numbers of cleaning cycles or time units Y massFigure 1 Mass of corroded specimensafter repetitive cleaning cycles2.1.3.3 The true mass of the specimen, after removal of the corrosion products, will be a value betweenthe masses representedbythe points B and D, depending on the degree ofp

33、rotection furnished bythecorrosion products during the cleaning procedure. 2.1.4 The preferred cleaning method will be that which a) provides efficient removal of corrosion products, b) provides loworzero mass loss when applied to new uncorroded specimens (see 2.1.3.1), and c) provides a curve of ma

34、ss as a function of the number of cleaning cycles or time of pickling, which is close to horizontalwhen the latter is plotted as the abscissa (see 2.1.3.2). 2.1.5 When chemical or electrolytic procedures are used, solutions freshly prepared with distilled ordeionized water and reagent grade chemical

35、s shall be used. 2.1.6 After cleaning, the specimen should be thoroughly rinsed with tap water,a light brushing during thisprocedure will help to remove any remaining surface products resulting from the cleaning process. Finally, theBS EN ISO 8407:2014 ISO 8407:2009 (E)Copyright British Standards In

36、stitution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted without license from IHS-,-,- ISO 2009 All rights reserved 3specimens shall be rinsed with distilled or deionized water. The specimen shall then be r insed thoroughly inethanol

37、and dried using a hot air blower or an oven. After that, the specimens shall be allowed 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 s olution which is specific

38、ally designed to remove the corrosion products with minimal dissolution of anybase metal. 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

39、of the test specimen to remove lightly adherent, bulky corrosion products. 2.2.3 Before the chemical treatment, clean the specimens as described in 2.1.1. In connectionwith theintermittent removal of specimens for weighing, brush the specimens, if necessary, to facilitate the removal oftightly adher

40、ent corrosion products. 2.3 Electrolytic proceduresElectrolytic cleaning can also be used to remove corrosion products. Several methods of electrolytic cleaningof corrosion test specimens are given in Annex A (see Table A.2). To facilitate the cleaning, it is stronglyrecommended to use an ultrasonic

41、 bath treatment. Electrolytic cleaning should be preceded by light brushing of the test specimen to remove lightly adherent,bulky corrosion products. Brushing should also follow electrolytic cleaning to remove anyloose slime ordeposits. This will help to minimize any redeposition of metal fro mreduc

42、ible corrosion products, which wouldreduce the mass loss.2.4 MechanicalproceduresMechanical procedures can include scraping, scrubbing, brushing, ultrasonic me thods, mechanical shock and impact blasting (grit blasting, water-jet blasting, etc.). These methods are often used to remove heavilyencrust

43、ed corrosion products. Scrubbing with a bristle brush and a mild abrasive/distilled water slurry can alsobe 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

44、 provide adequate removal of corrosion products. As with the other methods, correction formetal loss due to the cleaning method is recommended. Themechanical forces used in cleaning shall be maintained as constant as possible. 3 Test reportThe test report shall include the following information:a) a

45、 reference to this International Standard; b) the procedure used to 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 ornumber

46、of equal cleaning cycles; d) for electrolytic procedures, the composition 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; BS EN ISO 8407:2014 ISO 8407:2009 (E)Copyright

47、British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-4 ISO 2009 All rights reservede) formechanical procedures, the specific mechanical method employed (bristle-brush scrubbing, woo

48、den 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 clea ning (see 2.1.3.1) or from repetitiv e cleaning cycles (see 2.1.3.2) designed toassess

49、 mass lossfrom the removal of base metal during the cleaning process;h) the mass loss due to corrosion (see 2.1.3.3). BS EN ISO 8407:2014 ISO 8407:2009 (E)Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted without license from IHS-,-