1、CEN EN*ISO*b509 95 I 3404587 00757b4 215 BRITISH STANDARD Corrosion of metals and alloys - Determination of dezincification resistance of brass BS EN IS0 The European Standard EN IS0 6509 : 1995 has the status of a British Standard 6509 : 1995 CEN EN*ISO*b509 95 m 3404589 0095765 151 H BS EN IS0 650
2、9 : 1995 Amd. No. Date This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 July 1995 0 BSI 1995 Text affected Committees responsible for this British Standard The prepara
3、tion of this British Standard 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 British Steel Indu
4、stry 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 The following BSI references rel
5、ate to the work on this standard: Committee reference ISE/NFE/8 Draft announced in BSI Naos June 1993 ISBN O 580 24337 O CEN EN*IS0*6509 95 BB 3Y04589 0095766 O98 I BS EN IS0 6509 : 1995 Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Method 1 Scope and field
6、of application 3 2 Principle 3 3 Reagents and materials 3 4 Apparatus 5 Test pieces 6 Preparation of test pieces 7 Procedure 8 Acceptance limits 5 9 Test report 5 1 Example of test apparatus 4 2 Embedded test piece with one test surface 4 Figures i CEN EN*ISO*b509 95 3404589 0095767 T24 BS EN IS0 65
7、09 : 1995 National foreword This British Standard has been prepared under the direction of the Engineering Sector Board. It is identical with IS0 6509 : 1981, Corrosion ofmetals and alloys - Deterrnination of dexincification resistance of brass, published by the International Organization for Standa
8、rdization (ISO). Compliance with a British Standard does not of itself confer immunity from legal obligations. ii CEN EN*ISO*b509 95 3404589 0095768 960 E EUROPEAN STANDARD EN IS0 6509 NORME EUROPENNE EUROPISCHE NORM February1995 ICs 77.060 Descriptors: Corrosion, metais, alloys, tests, determinatio
9、n, corrosion resistance, brasses English version Corrosion of metals and alloys - Determination of dezincification resistance of brass (IS0 6509 : 1981) Corrosion des mtaux et alliages - Dtermination de la rsistance la dzincification du laiton (IS0 6509 : 1981) Korrosion von Metallen und Legierungen
10、 - Bestimmung der Entzinkungsbestndigkeit von Kupfer-Zink-Legierungen (IS0 6509 : 1981) This European Standard was approved by CEN on 1995-01-13. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a
11、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 three official versions (English, French, German). A version i
12、n 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 Austria, Belgium, Denmark, Finland, France, Germany, Greece,
13、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 Central Secretariat: rue de Stassart 36, B- 1050 Brussels O 1995 Copyright reser
14、ved to CEN members Ref. No. EN IS0 6509 : 1995 E Page 2 EN IS0 6509 : 1995 Foreword This European Standard has been taken over by the Technical Committee CEN/TC 262, Protection of metallic materials against corrosion, from the work of ISOTC 156, Corrsosion of metals and alloys, of the International
15、Organization for Standardization (ISO). 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 August 1995, and conflicting national standards shall be withdrawn at the latest by August 1995. According t
16、o the CENKENELEC Internal Regulations, the 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, United Kingdom. CEN EN*ISO*b509 9
17、5 3404589 0095770 519 M Page 3 EN IS0 6509 : 1995 Corrosion of metals and alloys - Determination of dezincification resistance of brass 1 Scope and field of application This International Standard specifies a method for the deter- mination of the dezincification resistance of brass exposed to fresh
18、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(l1) chloride solution followed by microscopic examination. 3 Reagents and materials Use only reagents of recognized analytical grade
19、 and distilled water or water of equivalent purity. 3.1 Copper(ll1 chloride. 1 94 (mim) solution, freshly prepared. Dissolve 12.7 g of copper(lli chloride dihydrate iCuCl2.2H20) in water and make UP the volume to 1 o00 ml. 3.2 similar properties, for embedding the test pieces. Phenolic resins, or ot
20、her non-conducting material with 3.3 Ethanol, for cleaning the test pieces. 4 Apparatus (see figure 1) 4.1 Beaker, of glass, covered with suitable plastic foil, for example polyethylene. secured with elastic thread or another method of sealing using non-metallic material. 4.2 Thermostatically contro
21、lled water or oil bath, capable of being controlled at 75 f 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 example by sawing and grinding with light pressure, that the properties of the materials are unaffected. 5.2 sample supplied for
22、testing. Not less than two test pieces shall be taken from each 5.2.1 For forgings and castings, at least one test piece shall be taken from the area with the thinnest section and at least one from the area with the thickest section. 5.2.2 In the case of materials with a specific extrusion or roll-
23、ing 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 test pieces, whether transverse or longitudinal, shall be cut in such a way as to in- clude points midway between the axis
24、and the periphev. 5.3 The area of each test piece to be exposed shall be approximately 100 rnm2. If the size of the component or the cross-section of the rod to be tested is too small to provide test areas of this size, the largest possible test area shall be taken. 6 Preparation of test pieces 6.1
25、The test pieces shall be embedded in the phenolic resin (3.2), and the test surfaces ground using wet abrasive paper, finishing with 500 grade or finer. (See figure 2.) 6.2 prior to testing. The test surfaces shall be cleaned with the ethanol (3.3) CEN EN*ISO+b509 95 3404589 0095773 455 = Page 4 EN
26、IS0 6509 : 1995 Figure 1 - Example of test apparatus Phenolic rain or equivalent material Ground test surfece Rgure 2 - Embedded test piece with one test surface CEN EN*IS0*6509 95 3404589 0095772 391 I Page 5 EN IS0 6509 : 1995 7 Procedure 7.1 Positioning of test pieces for test The test pieces sha
27、ll be placed in the beaker (4.1) containing the copper(I1) chloride solution (3.1) so that the test surfaces are vertical and at least 15 mm above the bottom of the beaker. The plastic foil shall then be placed over the beaker and secured. NOTE - 250 per 100 mrn2 of exposed surface of the test piece
28、. ml of the copperlili chloride solution are required 7.2 Operating conditions 7.2.1 The beaker containing the test pieces shall be placed in the thermostatically controlled bath (4.21, the temperature of which shall be maintained at 75 k 5 OC during the entire exposure period. 7.2.2 Different alloy
29、s shall not be tested simultaneously in the same beaker. 7.3 Duration of test The test pieces shall be exposed continuously for 24 h. At the end of this period, they shall be removed from the beaker, washed in water, rinsed in the ethanol and allowed to dry. 7.4 Preparation of sections for microscop
30、ic examination Microscopic examination of the test pieces shall be carried out as soon as possible after exposure. If the test pieces are stored before microscopic examination, they shall be kept in a desic- cator. Each test piece shall be sectioned at right angles to the exposed test surface and gr
31、ound and polished for microscopic examination. The total length of section through the exposed surface shall be not less than 5 mm. If the dimensions of the test piece make this impossible, the section shall be taken to provide the maximum possible total length. 7.5 Microscopic examination 7.5.1 The
32、 microsection prepared from each test area shall be examined using an optical microscope and the maximum depth of dezincification shall be recorded. The appropriate magnifica- tion shall be used to provide the greatest accuracy of measure- ment. 7.5.2 The length of the section examined shall be the
33、max- imum possible length. If there is evidence of edge effects, for example a greater depth of dezincification along the line of the interface between the mounting material and the brass, the maximum depth of dezincification shall be measured at a suffi- cient distance from the interface to render
34、such edge effects negligible. 7.5.3 For some purposes, 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 is limited to a sin
35、gle phase in the alloy, as well as measurements of the average depth of dezincification, may be required in ad- dition to measurement of the maximum depth of attack. In such cases, the methods to be used shall be laid down in the In- ternational Standards which refer to this test or shalf be agreed
36、between the parties concerned. 8 Acceptance limits Acceptance limits shall be laid down in the International Stan- dards 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 ea
37、ch material or product being tested : a) the type of product, material and manufacturer; b) the number of test pieces, and the total area of exposed test surfaces in square millimetres; c) d) tion; the length of section examined; the magnification employed for microscopic examina- e) the maximum dep
38、th of dezincification and, if required, the average depth and method of measuring it; f) tion (see 7.5.3); if required, the characteristics of dezincification distribu- g) other information necessary for assessment; hi the time and place of testing, and the name and title of the person responsible f
39、or the test. CEN EN*ISO*b507 75 $s 3Y04587 0075773 228 BS EN IS0 6509 : 1995 BSI 389 Chiswick High Road London W4 4AL 9507- 5- 0.5k- FP BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It
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