BS ISO BRITISH STANDARD 17864:2005 Corrosion ofmetals and alloys Determination of the critical pitting temperature under potientiostatic control ICS 77.060 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BS ISO 17864:2005 National foreword This British Standard reproduces verbatim IS017864:2005 and implements it as the UK national standard. BSI The UK participation 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, and keep 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 The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled "International Standards Correspondence Index", or by using the"Search" facility of theBSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not ofitself confer immunity fromlegalobligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 13 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication This British Standard was Licensed published under the authority Amd. No. Date Comments of the Standards Policy and Strategy Committee on 17 January 2006 BSI 17 January 2006 ISBN0580470997 BSISO17864:2005 ISO INTERNATIONAL STANDARD 17864 First edition 2005-08-01 Corrosion of metals and alloys Determination of the critical pitting temperature under potientiostatic control Corrosion des metaux et alliages - 一 Determinationdelatemperature critiquedepiqurationdes aciers inoxydablessous controle potentiostatique Reference number ISO 17864:2005(E) BSISO17864:2005 Contents Page Foreword IV Introductior 1 Scope 2 Normative reference 3 Terms and definitions.. 4 Principle. 5 Apparatus 6 Specimens.... 7 Calibrationofspecimentemperaturevs.solutiontemperature. 8 9 Assessmentofresults.. 10 Test report..... AnnexA (informative)Guidelinesforselectingthetestparameters. AnnexB (informative)Method of preventinga creviceattack....... AnnexC (informative)Potentialdifferenceof selectedreferenceelectrodes at25'cwithrespect to the standard hydrogen electrode (SHE) ... ili BSISO17864:2005 BS Foreword Copy, (c) 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 ,Uncontrolled International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. 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. iv BSIS017864:2005 Introduction Stainless steel is ssusceptibletoP pitting corrosion, crevice corrosion, and stress-corrosion cracking, etc., although it is used as generally a corrosion-resistan