BS EN ISO 6509-1995 Corrosion of metals and alloys Determination of dezincification resistance of brass《金属和合金耐腐蚀性 黄铜耐脱锌性测定》.pdf

1、BRITISH STANDARD BS EN ISO 6509:1995 Corrosion of metals and alloys Determination of dezincification resistance of brass The European Standard EN ISO6509:1995 has the status of a BritishStandardBSENISO6509:1995 This BritishStandard, having been prepared under the directionof the Engineering SectorBo

2、ard, was published underthe authority oftheStandards Board and comes into effect on 15 July1995 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference ISE/NFE/8 Draft announced in BSI News June1993 ISBN 0 580 24337 0 Committees responsible for this BritishSt

3、andard The preparation of this BritishStandard was entrusted by the Engineering Sector Board to Technical Committee ISE/NFE/8, Corrosion of metals and alloys, upon which the following bodies were represented: AEA Technology Aluminium Federation British Gas plc British Non-ferrous Metals Federation B

4、ritish Steel Industry Department of Trade and Industry (National Physical Laboratory) Department of Transport (Transport Research Laboratory) Electricity Association Institute of Corrosion Ministry of Defence Society of Chemical Industry Welding Institute Zinc Development Association Amendments issu

5、ed since publication Amd. No. Date CommentsBSENISO6509:1995 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope and field of application 3 2 Principle 3 3 Reagents and materials 3 4 Apparatus 3 5 Test pieces 3 6 Preparation of test pieces 3 7

6、 Procedure 3 8 Acceptance limits 5 9 Test report 5 Figure 1 Example of test apparatus 4 Figure 2 Embedded test piece with one test surface 4BSENISO6509:1995 ii BSI 01-2000 National foreword This BritishStandard has been prepared under the direction of the Engineering Sector Board. It is identical wi

7、th ISO6509:1981, Corrosion of metals and alloys Determination of dezincification resistance of brass, published by the International Organization for Standardization (ISO). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are respo

8、nsible for their correct application. 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, pagesi andii, theENISO title page, pages2 to5 and a back cover. This standard has been up

9、dated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO6509 February1995 ICS 77.060 Descriptors: Corrosion, metals, alloys, tests, determination, corrosion re

10、sistance, brasses English version Corrosion of metals and alloys Determination of dezincification resistance of brass (ISO6509:1981) Corrosion des mtaux et alliages Dtermination de la rsistance la dzincification du laiton (ISO6509:1981) Korrosion von Metallen und Legierungen Bestimmung der Entzinkun

11、gsbestndigkeit von Kupfer-Zink-Legierungen (ISO6509:1981) This European Standard was approved by CEN on1995-01-13. 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

12、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 three official versions (English, French, German). A version in any other language made by t

13、ranslation 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 Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxem

14、bourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 Copyright reserved to CEN members Ref.No.ENISO650

15、9:1995EENISO6509:1995 2 BSI 01-2000 Foreword This European Standard has been taken over by the Technical Committee CEN/TC262, Protection of metallic materials against corrosion, from the work of ISO/TC156, Corrosion of metals and alloys, of the International Organization for Standardization (ISO). T

16、his 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 August1995, and conflicting national standards shall be withdrawn at the latest by August1995. According to the CEN/CENELEC Internal Regulations, the

17、 following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, UnitedKingdom.ENISO6509:1995 BSI 01-2000 3 1 Scope and field of application

18、 This International Standard specifies a method for the determination of the dezincification resistance of brass exposed to fresh or saline waters. The method may be used for control or research purposes, but the field of application is not specified. 2 Principle Exposure of test pieces to copper(II

19、) chloride solution followed by microscopic examination. 3 Reagents and materials Use only reagents of recognized analytical grade and distilled water or water of equivalent purity. 3.1 Copper(II) chloride, 1% (m/m) solution, freshly prepared. Dissolve12,7g of copper(II) chloride dihydrate (CuCl 2 .

20、2H 2 O) in water and make up the volume to1000ml. 3.2 Phenolic resins, or other non-conducting material with similar properties, for embedding the test pieces. 3.3 Ethanol, for cleaning the test pieces. 4 Apparatus (seeFigure 1) 4.1 Beaker, of glass, covered with suitable plastic foil, for example p

21、olyethylene, secured with elastic thread or another method of sealing using non-metallic material. 4.2 Thermostatically controlled water or oil bath, capable of being controlled at75 5 C. 4.3 Optical microscope, with a scale. 5 Test pieces 5.1 The test pieces shall be taken in such a way, for exampl

22、e by sawing and grinding with light pressure, that the properties of the materials are unaffected. 5.2 Not less than two test pieces shall be taken from each sample supplied for testing. 5.2.1 For forgings and castings, at least one test piece shall be taken from the area with the thinnest section a

23、nd at least one from the area with the thickest section. 5.2.2 In the case of materials with a specific extrusion or rolling direction, for example plates or bars, surfaces both parallel and perpendicular to the extrusion or rolling direction shall be tested. In addition, in the case of rods, all te

24、st pieces, whether transverse or longitudinal, shall be cut in such a way as to include points midway between the axis and the periphery. 5.3 The area of each test piece to be exposed shall be approximately100mm 2 . If the size of the component or the cross-section of the rod to be tested is too sma

25、ll to provide test areas of this size, the largest possible test area shall be taken. 6 Preparation of test pieces 6.1 The test pieces shall be embedded in the phenolic resin(3.2), and the test surfaces ground using wet abrasive paper, finishing with500 grade or finer. (SeeFigure 2.) 6.2 The test su

26、rfaces shall be cleaned with the ethanol(3.3) prior to testing. 7 Procedure 7.1 Positioning of test pieces for test The test pieces shall be placed in the beaker(4.1) containing the copper(II) chloride solution(3.1) so that the test surfaces are vertical and at least15mm above the bottom of the beak

27、er. The plastic foil shall then be placed over the beaker and secured. NOTE250ml of the copper(II) chloride solution are required per100mm 2of exposed surface of the test piece. 7.2 Operating conditions 7.2.1 The beaker containing the test pieces shall be placed in the thermostatically controlled ba

28、th(4.2), the temperature of which shall be maintained at75 5 C during the entire exposure period. 7.2.2 Different alloys shall not be tested simultaneously in the same beaker. 7.3 Duration of test The test pieces shall be exposed continuously for24h. At the end of this period, they shall be removed

29、from the beaker, washed in water, rinsed in the ethanol and allowed to dry. 7.4 Preparation of sections for microscopic examination Microscopic examination of the test pieces shall be carried out as soon as possible after exposure. If thetest pieces are stored before microscopic examination, they sh

30、all be kept in a desiccator. Each test piece shall be sectioned at right angles to the exposed test surface and ground and polished for microscopic examination. The total length of section through the exposed surface shall be not less than5mm. If the dimensions of the test piece make this impossible

31、, the section shall be taken to provide the maximum possible total length. +50 10ENISO6509:1995 4 BSI 01-2000 7.5 Microscopic examination 7.5.1 The microsection prepared from each test area shall be examined using an optical microscope and the maximum depth of dezincification shall be recorded. The

32、appropriate magnification shall be used to provide the greatest accuracy of measurement. 7.5.2 The length of the section examined shall be themaximum possible length. If there is evidence ofedge effects, for example a greater depth of dezincification along the line of the interface between the mount

33、ing material and the brass, themaximum depth of dezincification shall be measured at a sufficient distance from the interface to render such edge effects negligible. Figure 1 Example of test apparatus Figure 2 Embedded test piece with one test surfaceENISO6509:1995 BSI 01-2000 5 7.5.3 For some purpo

34、ses, assessment of the characteristics of dezincification distribution, for example whether the depth of the dezincified zone is constant (layer dezincification) or varies greatly (localized dezincification) and whether the attack islimited to a single phase in the alloy, as well asmeasurements of t

35、he average depth of dezincification, may be required in addition to measurement of the maximum depth of attack. In such cases, the methods to be used shall be laid down in the International Standards which refer to this test or shall be agreed between the parties concerned. 8 Acceptance limits Accep

36、tance limits shall be laid down in the International Standards which refer to this test or shall be agreed between the parties concerned. 9 Test report Unless otherwise specified, the test report shall contain the following information for each material or product being tested: a) the type of produc

37、t, material and manufacturer; b) the number of test pieces, and the total area of exposed test surfaces in square millimetres; c) the length of section examined; d) the magnification employed for microscopic examination; e) the maximum depth of dezincification and, if required, the average depth and

38、 method of measuring it; f) if required, the characteristics of dezincification distribution (see7.5.3); g) other information necessary for assessment; h) the time and place of testing, and the name and title of the person responsible for the test.BS EN ISO 6509:1995 BSI 389 Chiswick High Road Londo

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