ISO 6509-2-2017 Corrosion of metals and alloys - Determination of dezincification resistance of copper alloys with zinc - Part 2 Assessment criteria《金属与合金的腐蚀 含锌.pdf

1、 ISO 2017 Corrosion of metals and alloys Determination of dezincification resistance of copper alloys with zinc Part 2: Assessment criteria Corrosion des mtaux et alliages Dtermination de la rsistance la dzincification des alliages de cuivre avec le zinc Partie 2: Critres dacceptation INTERNATIONAL

2、STANDARD ISO 6509-2 First edition 2017-03 Reference number ISO 6509-2:2017(E) ISO 6509-2:2017(E)ii ISO 2017 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized o

3、therwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright off

4、ice Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO 6509-2:2017(E)Foreword iv 1 Scope . 1 2 Normative references 1 3 Terms and definitions . 1 4 Assessment criteria . 1 Bibliography 3 ISO 2017 All rights rese

5、rved iii Contents Page ISO 6509-2:2017(E) 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

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7、otechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of

8、 ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be h

9、eld responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents). Any trade name used in this document is infor

10、mation given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (

11、WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: w w w . i s o .org/ iso/ foreword .html. This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys. This first edition of ISO 6509-2 cancels and replaces ISO 6509:1981, which has been t

12、echnically revised. A list of all parts in the ISO 6509 series can be found on the ISO website.iv ISO 2017 All rights reserved INTERNATIONAL ST ANDARD ISO 6509-2:2017(E) Corrosion of metals and alloys Determination of dezincification resistance of copper alloys with zinc Part 2: Assessment criteria

13、1 Scope This document specifies assessment criteria and provides guidance related to the corrosion type dezincification for the selection of copper alloys with a mass fraction of zinc of more than 15 %, exposed to fresh, saline waters or drinking water. The assessment criteria are based on the expos

14、ure tests in ISO 6509-1. The materials can be in the form of a semi-finished product or in the form of a final product (fittings, valves, etc.). This document is not applicable to complex products like flow-meters or pump-parts. In addition, other properties of the material might need to be taken in

15、to account for the intended application. This document is not intended to validate dezincification in case of failure in the application. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this docume

16、nt. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 8044, Corrosion of metals and alloys Basic terms and definitions ISO 6509-1, Corrosion of metals and alloys Determination of dezinci

17、fication resistance of copper alloys with zinc Part 1: Test method 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 8044 and the following apply. IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available

18、 at h t t p :/ www .iso .org/ obp 3.1 dezincification resistant copper alloy copper alloys with a mass fraction of zinc more than 15 % tested according to ISO 6509-1 and fulfilling the assessment criteria in this document 4 Assessment criteria The assessment criteria given in Table 1 refer to dezinc

19、ification depth determination using the method given in ISO 6509-1. The minimum requirement for an alloy to be classified as dezincification resistant is that both the average and the maximum depth of dezincification shall be less than the values in Table 1 or in national standard documents as appro

20、priate. ISO 2017 All rights reserved 1 ISO 6509-2:2017(E) The assessment criteria in Table 1 are based on a large amount of tests and long experience in practice, mainly on sanitary household installations (see Reference 1, 2 and 3). Copper alloys with zinc satisfying these assessment criteria have

21、been shown to satisfactorily resist dezincification for similar applications. Nevertheless, the corrosivity of the local water should be assessed when applying these assessment criteria as the likelihood of dezincification will depend on the local source of the water, flow rate and how well the syst

22、em is managed. In some applications, more restrictive limits than those listed in Table 1 might be required and relevant national standards shall be consulted where applicable (for example, JIS H 3250 for Japan 4 , EN 12288 for the UK 5 , NSF/ANSI 14 for USA 6and product standards EN 12163 to EN 121

23、68 7-12 , EN 12420 13and EN 1982 14 . The acceptance criteria for the application shall be agreed between interested parties. The values listed in Table 1 will provide guidance on selecting dezincification resistant alloys but do not necessarily fully qualify a material for service in these environm

24、ents as there may be other factors that need to be accounted for in assessing suitably of a material for the application. Table 1 Assessment criteria End product type Average dezincification depth, m (max.) Maximum dezincification depth, m (max.) (a) Final forgings and castings after machining, incl

25、uding continuously casted bars 100 200 (b) Extruded bars/profiles for machining purposes longitudinal direction transverse direction300 100400 2002 ISO 2017 All rights reserved ISO 6509-2:2017(E) Bibliography 1 Linder M. “Twenty years of experience of dezincification resistant brasses in Swedish tap

26、 water systems”, NACE 12th International Corrosion Congress, vol. 513, 1993. 2 Linder M., & Mattsson E. “Test method for determination of the dezincification resistance of brass used in pipe fittings”, Eurocorr proceeding pp. 445-451, 1977. 3 Holm R., Sundberg R., Mattsson E. “Experiences with brass

27、 components for water installations in Sweden”, Proceedings of the Int. Symposium on Corrosion of Copper and Copper alloys in Building, Tokyo, Japan ( 1982): pp.230-238. 4 JIS H 3250, Copper and copper alloy rods and bars 5 EN 12288, Industrial valves. Copper alloy gate valves 6 NSF 14-2015, Plastic

28、 piping system components and related materials 7 EN 12163, Copper and copper alloys Rod for general purposes 8 EN 12164, Copper and copper alloys Rod for free machining purposes 9 EN 12165, Copper and copper alloys Wrought and unwrought forging stock 10 EN 12166, Copper and copper alloys - Wire for

29、 general purposes 11 EN 12167, Copper and copper alloys Profiles and bars for general purposes 12 EN 12168, Copper and copper alloys Hollow rod for free machining purpose 13 EN 12420, Copper and copper alloys Forgings 14 EN 1982, Copper and copper alloys ingots and castings ISO 2017 All rights reserved 3 ISO 6509-2:2017(E) ISO 2017 All rights reserved ICS 77.060 Price based on 3 pages