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1、BRITISH STANDARD BS EN ISO 11130:1999 Corrosion of metals and alloys Alternate immersion test in salt solution The European Standard EN ISO 11130:1999 has the status of a British Standard ICS 77.060 BS EN ISO 11130:1999 This British Standard, having been prepared under the direction of the Engineeri
2、ng Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 November 1999 BSI 04-2000 ISBN 0 580 32932 1 National foreword This British Standard is the English language version of EN ISO 11130:1999. It is identical with ISO 11130:1999. The UK partici
3、pation in its preparation was entrusted to Technical Committee ISE/NFE/8, Corrosion of metals and alloys, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, a
4、nd keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards
5、normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the sec
6、tion entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application
7、. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, page 2, the ISO title page, pages ii to iv, pages 1 to 10, an inside back cover and a
8、back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments BS EN ISO 11130:1999 BSI 04-2000i Contents Page National forewor
9、dInside front cover Foreword2 Forewordiii Text of ISO 111301 ii blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 11130 August 1999 ICS 77.060 English version Corrosion of metals and alloys Alternate immersion test in salt solution (ISO 11130:1999) Corrosion des mtaux et alliages Essai
10、en immersions alternes en solution saline (ISO 11130:1999) Korrosion von Metallen und Legierungen Wechseltauchprfung in Salzlsung (ISO 11130:1999) This European Standard was approved by CEN on 16 July 1999. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the
11、 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 Central Secretariat or to any CEN member. This European Standard exists in
12、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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of
13、 Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Ce
14、ntral Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 11130:1999 E EN ISO 11130:1999 BSI 04-2000 2 Foreword The text of the International Standard ISO 11130:1999 has been pr
15、epared by Technical Committee ISO/TC 156 “Corrosion of metals and alloys” in collaboration with 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 publicat
16、ion of an identical text or by endorsement, at the latest by February 2000, and conflicting national standards shall be withdrawn at the latest by February 2000. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement
17、this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. NOTE FROM CEN/CS: The foreword is susceptible to be amended on reception of the
18、German language version. The confirmed or amended foreword, and when appropriate, the normative Annex ZA for the references to international publications with their relevant European publications will be circulated with the German version. Endorsement notice The text of the International Standard IS
19、O 11130:1999 was approved by CEN as a European Standard without any modification. NOTENormative references to International Standards are listed in Annex ZA (normative). EN ISO 11130:1999 ii BSI 04-2000 Contents Page Forewordiii Introduction1 1Scope1 2Normative references1 3Principal1 4Test solution
20、2 4.1General2 4.2Preparation2 5Apparatus2 5.1General2 5.2Materials of construction2 5.3Test specimen holders3 5.4Air circulation3 6Procedure3 6.1Test conditions3 6.2Test specimens3 6.3Test reagent4 7Calibration of the test facility4 8Cleaning of test specimens4 9Assessment of results4 10Test report4
21、 Annex A (informative) Suggested test solutions6 Annex B (informative) Suitable apparatus for alternate immersion tests in salt solution8 Annex ZA (normative) Normative references to international publications with their relevant European publicationsInside back cover Bibliography10 Figure B.18 EN I
22、SO 11130:1999 BSI 04-2000iii Foreword ISO (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 interest
23、ed 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 Co
24、mmission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication a
25、s an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 11130 was prepared by Technical committee ISO/TC 156, Corrosion of metals and alloys. Annex A and Annex B of this International Standard are for information only. iv blank E
26、N ISO 11130:1999 BSI 04-20001 Introduction Corrosion of metals is influenced by factors which may vary significantly with environmental conditions. Therefore, corrosion resistance determined for metals during alternate immersion testing described in this International Standard may vary greatly with
27、the test solution selected, the temperature during immersion and the temperature and humidity during the drying periods of test. Consequently, the result of an alternate immersion corrosion test should not be taken as indicative of the corrosion resistance of metal tested in all the different servic
28、e environments in which the metal may be used. Nevertheless, results obtained by the method described in this International Standard may indicate the relative corrosion resistance of different metals under in-service conditions, particularly when the service environment is similar to the test soluti
29、on selected. The method may also be used to test metals under an applied tensile stress. 1 Scope The purpose of this International Standard is to define a method of assessing the corrosion resistance of metals by an alternate immersion test in salt solution, with or without applied stress. The test
30、is particularly suitable for quality control during the manufacture of metals including aluminium alloys and ferrous materials, and also for assessment purposes during alloy development. Depending upon the chemical composition of the test solution, the test may be used to simulate the corrosive effe
31、cts of marine splash zones, de-icing fluids and acid salt environments. The term “metal” as used in this International Standard includes metallic materials with or without corrosion protection. The alternate immersion test applies to: metals and their alloys; certain metallic coatings (anodic and ca
32、thodic with respect to the substrate); certain conversion coatings; certain anodic oxide coatings; organic coatings on metals. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For
33、dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For
34、undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1462:1973, Metallic coatings Coatings other than those anodic to the basis metal Accelerated corrosion tests Method for the
35、evaluation of the results. ISO 4540:1980, Metallic coatings Coatings cathodic to the substrate Rating of electroplated test specimens subjected to corrosion tests. ISO 7539-1:1987, Corrosion of metals and alloys Stress corrosion testing Part 1: General guidance on testing procedures. ISO 8407:1991,
36、Corrosion of metals and alloys Removal of corrosion products from corrosion test specimens. 3 Principle The test consists of immersion of a test specimen, stressed (see ISO 7539-1) or unstressed, in a salt solution, followed by withdrawal and a period of drying. The immersion/drying cycle is repeate
37、d at a given frequency for a given period. The extent of attack is then evaluated. For many materials, this provides a more severe corrosion test than simple continuous immersion. EN ISO 11130:1999 2 BSI 04-2000 4 Test solution 4.1 General The test solution shall be prepared using reagent grade chem
38、icals conforming to the prescribed specification. Otherwise, the solution used should be the one most appropriate to the intended service conditions. Subclause 4.2 gives details of a neutral salt solution that is suitable for simulating the corrosive effect of a marine environment. Details of three
39、other test solutions suitable for simulating salt-based de-icing liquid, acid salt conditions and ocean water are given in Annex A. 4.2 Preparation The neutral salt solution is prepared by dissolving a sufficient mass of sodium chloride in distilled or deionized water to give a concentration of 35 g
40、/l 1 g/l. The distilled or de-ionized water used shall have a conductivity not higher than 2 mS/m at 25 C 2 C. The maximum allowable impurity content in the sodium chloride solution shall be as follows: Prior to use, check the pH of the salt solution by means of electrometric measurement at 25 C 2 C
41、 or in routine checks, with a short-range pH paper which can be read in increments of 0,3 pH units or less. If the pH value determined is outside the range 6,0 to 7,0 adjustments shall be made by adding to the salt solution, diluted hydrochloric acid or sodium hydroxide of analytical grade. The volu
42、me of the test solution should be defined by the specification of the product. If no specification is available, it is recommended that the volume should be not less than 3 l/dm2 of test specimen area. 5 Apparatus 5.1 General The apparatus shall include the following components: a suitable system de
43、signed for the automatic, continuous performance of complete cycles of alternate immersion and withdrawal of the test specimens. This system shall provide uninterrupted operation throughout the duration of the test (see 6.1). Each test specimen shall be connected to the system using suitable insulat
44、ing material; one or more glass or plastic containers for the reagent. In the immersed position, only one kind of metal, alloy or coating shall be immersed in each container. Replicate specimens can share the same container. NOTE 1The system should be designed such that the time taken for full immer
45、sion or withdrawal of each specimen is no more than 2 min. NOTE 2Suitable apparatus for conducting alternate immersion tests is illustrated schematically in Annex B. 5.2 Materials of construction 5.2.1 Materials of construction that come into contact with the test solution shall be such that they ar
46、e not affected by the corrodent to the extent that they can cause contamination of the solution and change its corrosivity. 5.2.2 Use of inert plastics or glass is recommended where feasible. 5.2.3 Metallic materials of construction shall be selected from alloys that are corrosion resistant to the t
47、est environment or shall be protected with a suitable corrosion resistant coating that also satisfies the conditions given in 5.2.1. Impurity Maximum permissible content % (m/m) Remarks Copper0,001 Determined by atomic absorption spectrophotometry or other method of similar accuracy Nickel0,001 Sodi
48、um iodide0,1 Calculated for dry salt Total0,5 EN ISO 11130:1999 BSI 04-20003 5.3 Test specimen holders 5.3.1 Test specimen holders shall be designed to electrically insulate the test specimens from each other and from any other bare metal. When this is not possible, as in the case of certain stressi
49、ng bolts or jigs, the bare metal in contact with the specimen should be isolated from the corrodent by suitable insulating materials. If a protective coating is used, it shall be of a type that will not leach inhibiting or accelerating ions or protective oils over the non-coated portions of the specimen. In particular, coatings containing chromates shall be avoided. 5.3.2 The shape and form of test specimen supports and holders shall be such that: they avoid, as much as possible, any interference of free contac
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