1、Corrosion of metals and alloys Measurement of critical crevice temperature for cylindrical crevice geometries in ferric chloride solutionBS ISO 19280:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Corrosion of metals and alloys Measurement of critical c
2、revice temperature for cylindrical crevice geometries in ferric chloride solutionCorrosion des mtaux et alliages Mesure de la temprature critique de corrosion caverneuse de crevasses de gomtries cylindriques dans une solution de chlorure ferriqueINTERNATIONAL STANDARDISO19280First edition2017-08Refe
3、rence numberISO 19280:2017(E)National forewordThis British Standard is the UK implementation of ISO 19280:2017.The UK participation in its preparation was entrusted to Technical Committee ISE/NFE/8, Corrosion of metals and alloys.A list of organizations represented on this committee can be obtained
4、on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 84635 9ICS 77.060Compliance with a Brit
5、ish Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 19280:2017 ISO 2017Corrosion o
6、f metals and alloys Measurement of critical crevice temperature for cylindrical crevice geometries in ferric chloride solutionCorrosion des mtaux et alliages Mesure de la temprature critique de corrosion caverneuse de crevasses de gomtries cylindriques dans une solution de chlorure ferriqueINTERNATI
7、ONAL STANDARDISO19280First edition2017-08Reference numberISO 19280:2017(E)BS ISO 19280:2017ISO 19280:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or
8、utilized otherwise 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 copy
9、right officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 19280:2017ISO 19280:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless ot
10、herwise specified, no part of this publication may be reproduced or utilized otherwise 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 addres
11、s below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgISO 19280:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and d
12、efinitions . 14 General principles . 14.1 Objective . 14.2 Immersion test 24.2.1 General 24.2.2 CCT measurements in single test cell . 24.2.3 CCT measurements in multiple test cells 24.3 Criterion for CCT 25 Apparatus . 25.1 Crevice former assembly 25.2 Test cell 65.2.1 General 65.2.2 Flask requirem
13、ents 65.2.3 Condenser 75.3 Test temperature . 75.4 Crevice assembly . 75.4.1 Supporting deck blocks and crevice formers 75.4.2 Reuse of crevice assemblies 105.4.3 Bolt and washer .105.5 Required apparatus . 106 Test solutions 107 Test specimen .107.1 Specimen size 107.2 Surface finish . 118 Experime
14、ntal procedure .119 Examination and evaluation 129.1 Examination 129.2 Evaluation . 129.3 Estimation of CCT 1210 Test report 12Bibliography .14 ISO 2017 All rights reserved iiiContents PageBS ISO 19280:2017ISO 19280:2017(E)ForewordISO (the International Organization for Standardization) is a worldwi
15、de 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 in a subject for which a technical committee has been established has the right to be represented on tha
16、t committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this docu
17、ment 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 ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directiv
18、es, 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 held responsible for identifying any or all such patent rights. Details of any patent rights identified during the develop
19、ment 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 information given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary natu
20、re 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 (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This do
21、cument was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.iv ISO 2017 All rights reservedBS ISO 19280:2017ISO 19280:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work
22、 of preparing International Standards is normally carried out through ISO technical committees. Each member body interested 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-governmen
23、tal, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical 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
24、 ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of 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 pos
25、sibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held 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
26、of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information 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 relat
27、ed to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 156, Corrosion of meta
28、ls and alloys.iv ISO 2017 All rights reserved ISO 19280:2017(E)IntroductionVarious dimensions of pipes and tubes are used in industries such as nuclear power plants, thermal power plants, desalination plants, oil refining facilities and chemical plants, etc. Materials evaluation for these pipes, tub
29、es and fittings makes all the difference to safety and life cycles in these industrial facilities.There are numerous standards that specify test methods and corrosion resistance for pitting and crevice corrosion. Many of them address the corrosion rate or critical pitting temperature (CPT) or critic
30、al crevice temperature (CCT) of plate type specimens, but they are not concerned with other geometries and relations of corrosion resistance between geometries.It is important that the initiation temperature of crevice corrosion be measured in cylindrical crevice geometries for high corrosion resist
31、ant alloys, including from traditional stainless steels (300 series) to super stainless steels (higher alloyed stainless steels).This document provides the test method that measures crevice corrosion resistance in crevice geometries such as tube/tube sheet of heat exchangers and pipes/pipe supports,
32、 flange/couplings, bolts/nuts, etc. in industrial facilities. It can be used as a guideline which offers the criterion for materials selection of such components.Most crevice corrosion tests are performed conforming to some standards, but these test methods use a flat geometry of an artificial crevi
33、ce which shows different critical crevice temperatures to those of cylindrical crevice geometry. Therefore, results of these tests have created controversies in related industries. It has been found that the identical CCT between plate type and cylindrical type specimens could be achieved with an ap
34、propriate torque applied to the cylindrical specimen. ISO 2017 All rights reserved vBS ISO 19280:2017Corrosion of metals and alloys Measurement of critical crevice temperature for cylindrical crevice geometries in ferric chloride solution1 ScopeThis document specifies a methodology for ranking the c
35、revice corrosion resistance of stainless steels and related alloys when exposed to oxidizing chloride solution. This document allows the measurement of critical crevice temperatures of tube/rod type specimens equal to those of plate type ones made up of the same material by chemical initiation of cr
36、evice corrosion, but not by the electrochemical method of ISO 18070. The test method in this document defines the apparatus and the procedure used to measure the temperature of crevice corrosion initiated in pipes and tubes using cylindrical specimens. This method has also been proved to apply to pl
37、ate type specimens.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (i
38、ncluding any amendments) applies.ISO 8044, Corrosion of metals and alloys Basic terms and definitions3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 8044 and the following apply.ISO and IEC maintain terminological databases for use in standardization
39、at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1critical crevice temperatureCCTminimum temperature required to produce a crevice attack of at least 0,025 mm corroded depth on the
40、bold surface of a specimen beneath the crevice former (3.2), with the edge attack ignoredNote 1 to entry: Measured in degrees Celsius.3.2crevice formercomponent of the crevice corrosion test tool assembly, which allows crevice corrosion to be induced in a contacted test specimen by applying certain
41、torques4 General principles4.1 ObjectiveThis document describes laboratory tests for measuring CCT of stainless steels and high corrosion resistant alloys with cylindrical (including circular arc) and flat plate geometries in oxidizing chloride solutions. Cylindrical crevice geometries emulate crevi
42、ces frequently coming from tube/tube sheet INTERNATIONAL STANDARD ISO 19280:2017(E) ISO 2017 All rights reserved 1BS ISO 19280:2017Corrosion of metals and alloys Measurement of critical crevice temperature for cylindrical crevice geometries in ferric chloride solution1 ScopeThis document specifies a
43、 methodology for ranking the crevice corrosion resistance of stainless steels and related alloys when exposed to oxidizing chloride solution. This document allows the measurement of critical crevice temperatures of tube/rod type specimens equal to those of plate type ones made up of the same materia
44、l by chemical initiation of crevice corrosion, but not by the electrochemical method of ISO 18070. The test method in this document defines the apparatus and the procedure used to measure the temperature of crevice corrosion initiated in pipes and tubes using cylindrical specimens. This method has a
45、lso been proved to apply to plate type specimens.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition
46、 of the referenced document (including any amendments) applies.ISO 8044, Corrosion of metals and alloys Basic terms and definitions3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 8044 and the following apply.ISO and IEC maintain terminological databas
47、es for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1critical crevice temperatureCCTminimum temperature required to produce a crevice attack of at least 0
48、,025 mm corroded depth on the bold surface of a specimen beneath the crevice former (3.2), with the edge attack ignoredNote 1 to entry: Measured in degrees Celsius.3.2crevice formercomponent of the crevice corrosion test tool assembly, which allows crevice corrosion to be induced in a contacted test
49、 specimen by applying certain torques4 General principles4.1 ObjectiveThis document describes laboratory tests for measuring CCT of stainless steels and high corrosion resistant alloys with cylindrical (including circular arc) and flat plate geometries in oxidizing chloride solutions. Cylindrical crevice geometries emulate crevices frequently coming from tube/tube sheet INTERNATIONAL STANDARD ISO 19280:2017(E) ISO 2017 All rights reserved 1 ISO 19280:2017(E)of heat exchangers and pipes/pipe supports, flange/coupli
