EN ISO 9227-2012 en Corrosion tests in artificial atmospheres - Salt spray tests《人造大气腐蚀试验 盐雾试验》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 9227:2012Corrosion tests in artificialatmospheres Salt spray tests(ISO 9227:2012)BS EN ISO 9227:2012 BRITISH STANDARDNational forewordThis British Standard is the UK im

2、plementation of EN ISO 9227:2012.It supersedes BS EN ISO 9227:2006 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ISE/NFE/8, Corrosion of metals and alloys.A list of organizations represented on this committee can beobtained on request to its secretary

3、.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 76011 2ICS 19.040; 77.060Compliance with a British Standard cannot c

4、onfer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 May 2012.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9227 May 2012 ICS 77.060 Supersedes

5、EN ISO 9227:2006English Version Corrosion tests in artificial atmospheres - Salt spray tests (ISO 9227:2012) Essais de corrosion en atmosphres artificielles - Essais aux brouillards salins (ISO 9227:2012) Korrosionsprfungen in knstlichen Atmosphren - Salzsprhnebelprfungen (ISO 9227:2012) This Europe

6、an Standard was approved by CEN on 14 May 2012. 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-date lists and bibliographical references concern

7、ing 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 under the responsibility of a CEN member into

8、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, France, Germany, Greece, Hungary, Iceland, Ireland

9、, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Mar

10、nix 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 9227:2012: EBS EN ISO 9227:2012EN ISO 9227:2012 (E) 3 Foreword This document (EN ISO 9227:2012) has been prepared by Technical Committee ISO/TC 156 “C

11、orrosion of metals and alloys“ in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of which is held by DIN. 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

12、November 2012, and conflicting national standards shall be withdrawn at the latest by November 2012. 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

13、patent rights. This document supersedes EN ISO 9227:2006. 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, F

14、inland, 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 ISO 9227:2012 has been approved by CE

15、N as a EN ISO 9227:2012 without any modification. BS EN ISO 9227:2012ISO 9227:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope 12 Normative references . 13 Test solutions . 23.1 Preparation of the sodium chloride solution . 23.2 pH adjustment 23.3 Filtration . 24

16、 Apparatus 34.1 Component protection . 34.2 Spray cabinet 34.3 Heater and temperature control 34.4 Spraying device . 34.5 Collecting devices . 44.6 Reuse . 45 Method for evaluating cabinet corrosivity 45.1 General . 45.2 NSS test . 55.3 AASS test . 65.4 CASS test . 76 Test specimens 87 Arrangement o

17、f the test specimens . 88 Operating conditions 99 Duration of tests 910 Treatment of specimens after test 1011 Evaluation of results .1012 Test report .10Annex A (informative) Schematic diagram of one possible design of spray cabinet with means for treating fog exhaust and drain .12Annex B (informat

18、ive) Complementary method for evaluating cabinet corrosivity using zinc reference specimens 14Annex C (normative) Preparation of panels with organic coatings for testing .16Annex D (normative) Required supplementary information for testing test panels with organic coatings 17Bibliography .18BS EN IS

19、O 9227:2012ISO 9227:2012(E)ForewordISO (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 member body interested

20、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 Electrotechnical Commi

21、ssion (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 adopted by the technical

22、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 patent rights. ISO shall n

23、ot be held responsible for identifying any or all such patent rights.ISO 9227 was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.This third edition cancels and replaces the second edition (ISO 9227:2006), of which it constitutes a minor revision.iv ISO 2012 All rights res

24、ervedBS EN ISO 9227:2012ISO 9227:2012(E)IntroductionThere is seldom a direct relation between resistance to the action of salt spray and resistance to corrosion in other media, because several factors influencing the progress of corrosion, such as the formation of protective films, vary greatly with

25、 the conditions encountered. Therefore, the test results should not be regarded as a direct guide to the corrosion resistance of the tested metallic materials in all environments where these materials might be used. Also, the performance of different materials during the test should not be taken as

26、a direct guide to the corrosion resistance of these materials in service.Nevertheless, the method described gives a means of checking that the comparative quality of a metallic material, with or without corrosion protection, is maintained.Salt spray tests are generally suitable as corrosion protecti

27、on tests for rapid analysis for discontinuities, pores and damage in organic and inorganic coatings. In addition, for quality control purposes, comparison can be made between specimens coated with the same coating. As comparative tests, however, salt spray tests are only suitable if the coatings are

28、 sufficiently similar in nature.It is often not possible to use results gained from salt spray testing as a comparative guide to the long-term behaviour of different coating systems, since the corrosion stress during these tests differs significantly from the corrosion stresses encountered in practi

29、ce. ISO 2012 All rights reserved vBS EN ISO 9227:2012BS EN ISO 9227:2012Corrosion tests in artificial atmospheres Salt spray tests1 ScopeThis International Standard specifies the apparatus, the reagents and the procedure to be used in conducting the neutral salt spray (NSS), acetic acid salt spray (

30、AASS) and copper-accelerated acetic acid salt spray (CASS) tests for assessment of the corrosion resistance of metallic materials, with or without permanent or temporary corrosion protection.It also describes the method employed to evaluate the corrosivity of the test-cabinet environment.It does not

31、 specify the dimensions of test specimens, the exposure period to be used for a particular product, or the interpretation of results. Such details are provided in the appropriate product specifications.The salt spray tests are particularly useful for detecting discontinuities, such as pores and othe

32、r defects in certain metallic, organic, anodic oxide and conversion coatings.The neutral salt spray test is the test method in which a 5 % sodium chloride solution in the pH range from 6,5 to 7,2 is atomized under a controlled environment. It particularly applies to: metals and their alloys, metalli

33、c coatings (anodic and cathodic), conversion coatings, anodic oxide coatings, and organic coatings on metallic materials.The acetic acid salt spray test is the test method in which a 5 % sodium chloride solution with the addition of glacial acetic acid in the pH range from 3,1 to 3,3 is atomized und

34、er a controlled environment. It is especially useful for testing decorative coatings of copper + nickel + chromium, or nickel + chromium. It has also been found suitable for testing anodic coatings on aluminum.The copper-accelerated acetic acid salt spray test is the test method in which a 5 % sodiu

35、m chloride solution with the addition of copper chloride and glacial acetic acid in the pH range from 3,1 to 3,3 is atomized under a controlled environment. It is useful for testing decorative coatings of copper + nickel + chromium, or nickel + chromium. It has also been found suitable for testing a

36、nodic coatings on aluminum.The salt spray methods are all suitable for checking that the comparative quality of a metallic material, with or without corrosion protection, is maintained. They are not intended to be used for comparative testing as a means of ranking different materials relative to eac

37、h other with respect to corrosion resistance.2 Normative referencesThe 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 document (including any ame

38、ndments) applies.ISO 1514, Paints and varnishes Standard panels for testingISO 2808, Paints and varnishes Determination of film thicknessISO 3574, Coldreduced carbon steel sheet of commercial and drawing qualitiesISO 8407, Corrosion of metals and alloys Removal of corrosion products from corrosion t

39、est specimensINTERNATIONAL STANDARD ISO 9227:2012(E) ISO 2012 All rights reserved 1BS EN ISO 9227:2012ISO 9227:2012(E)ISO 17872, Paints and varnishes Guidelines for the introduction of scribe marks through coatings on metallic panels for corrosion testing3 Test solutions3.1 Preparation of the sodium

40、 chloride solutionDissolve a sufficient mass of sodium chloride in distilled or deionized water with a conductivity not higher than 20 S/cm at 25 C 2 C to produce a concentration of 50 g/l 5 g/l. The sodium chloride concentration of the sprayed solution collected shall be 50 g/l 5 g/l. The specific

41、gravity range for a 50 g/l 5 g/l solution is 1,029 to 1,036 at 25 C.The sodium chloride shall contain less than 0,001 % mass fraction of copper and less than 0,001 % mass fraction of nickel, as determined by atomic absorption spectrophotometry or another analytical method of similar sensitivity. It

42、shall not contain more than 0,1 % of a mass fraction of sodium iodide, or more than 0,5 % of a mass fraction of total impurities calculated for dry salt.NOTE If the pH of the prepared solution at 25 C 2 C is outside the range 6,0 to 7,0, investigate the presence of undesirable impurities in the salt

43、 and/or the water.3.2 pH adjustment3.2.1 pH of the salt solutionAdjust the pH of the salt solution to the desired value on the basis of the pH of the sprayed solution collected.3.2.2 NSS testAdjust the pH of the salt solution (3.1) so that the pH of the sprayed solution collected within the test cab

44、inet (4.2) is 6,5 to 7,2 at 25 C 2 C. Check the pH using electrometric measurement or in routine checks, with a short-range pH paper, which can be read in increments or 0,3 pH units or less. Make any necessary corrections by adding hydrochloric acid, sodium hydroxide or sodium bicarbonate solution o

45、f analytical grade.Possible changes in pH may result from loss of carbon dioxide from the solution when it is sprayed. Such changes can be avoided by reducing the carbon dioxide content of the solution by, for example, heating it to a temperature above 35 C before it is placed in the apparatus, or b

46、y making the solution using freshly boiled water.3.2.3 AASS testAdd a sufficient amount of glacial acetic acid to the salt solution (3.1) to ensure that the pH of samples of sprayed solution collected in the test cabinet (4.2) is between 3,1 and 3,3. If the pH of the solution initially prepared is 3

47、,0 to 3,1, the pH of the sprayed solution is likely to be within the specified limits. Check the pH using electrometric measurement at 25 C 2 C, or in routine checks, with a short-range pH paper which can be read in increments of 0,1 pH units or less. Make any necessary corrections by adding glacial

48、 acetic acid or sodium hydroxide of analytical grade.3.2.4 CASS testDissolve a sufficient mass of copper(II) chloride dihydrate (CuCl22H2O) in the salt solution (3.1) to produce a concentration of 0,26 g/l 0,02 g/l equivalent to (0,205 0,015) g of CuCl2per litre.Adjust the pH using the procedures de

49、scribed in 3.2.3.3.3 FiltrationIf necessary, filter the solution before placing it in the reservoir of the apparatus, to remove any solid matter which might block the apertures of the spraying device.2 ISO 2012 All rights reservedBS EN ISO 9227:2012ISO 9227:2012(E)4 Apparatus4.1 Component protectionAll components in contact with the spray or the test solution shall be made of, or lined with, materials resistant to corrosion by the sprayed solution and which do not influence the corrosivity of the sprayed test