EN ISO 10271:2011

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zobozdravstvo - Preskusne metode ugotavljanja korozije za kovinske materiale (ISO 10271:2011)Zahnheilkunde - Korrosionsprüfverfahren für metallische Werkstoffe (ISO 10271:2011)Médecine bucco-dentaire - Méthodes d'essai de corrosion des matériaux métalliques (ISO 10271:2011)Dentistry - Corrosion test methods for metallic materials (ISO 10271:2011)11.060.10Dental materialsICS:Ta slovenski standard je istoveten z:EN ISO 10271:2011SIST EN ISO 10271:2011en,fr,de01-december-2011SIST EN ISO 10271:2011SLOVENSKI
STANDARDSIST EN ISO 10271:2002/AC:2006SIST EN ISO 10271:20021DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN ISO 10271
August 2011 ICS 11.060.10 Supersedes EN ISO 10271:2001English Version
Dentistry - Corrosion test methods for metallic materials (ISO 10271:2011)
Médecine bucco-dentaire - Méthodes d'essai de corrosion des matériaux métalliques (ISO 10271:2011)
Zahnheilkunde - Korrosionsprüfverfahren für metallische Werkstoffe (ISO 10271:2011) This European Standard was approved by CEN on 29 July 2011.
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 alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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Reference numberISO 10271:2011(E)© ISO 2011
INTERNATIONAL STANDARD ISO10271Second edition2011-08-01Dentistry — Corrosion test methods for metallic materials Médecine bucco-dentaire — Méthodes d'essai de corrosion des matériaux métalliques
ISO 10271:2011(E)
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ISO 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 • CH-1211 Geneva 20 Tel.
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ii © ISO 2011 – All rights reserved
ISO 10271:2011(E) © ISO 2011 – All rights reserved iii Contents Page Foreword.iv Introduction.v 1 Scope.1 2 Normative references.1 3 Terms and definitions.1 4 Test methods.3 4.1 Static immersion test.3 4.2 Electrochemical test.6 4.3 Sulfide tarnish test (cyclic immersion).12 4.4 Sulfide tarnish test (static immersion).14 4.5 Static immersion test with periodic analysis.16 Annex A (informative)
Corrosion test method development.20 Bibliography.26
ISO 10271:2011(E) iv © ISO 2011 – All rights reserved 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 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-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. International Standards are drafted in accordance with the rules given in the ISO/IEC 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. ISO 10271 was prepared by Technical Committee ISO/TC 106, Dentistry, Subcommittee SC 2, Prosthodontic materials. This second edition cancels and replaces the first edition (ISO 10271:2001), which has been technically revised, in particular by the inclusion of two additional test methods. It also incorporates Technical Corrigendum ISO 10271:2001/Cor.1:2005. SIST EN ISO 10271:2011

ISO 10271:2011(E) © ISO 2011 – All rights reserved v Introduction This International Standard was developed from the original Technical Report (ISO/TR 10271) as a result of worldwide demand for standard test methods to determine acceptability of metallic materials for oral restorations in relation to corrosion. Specific qualitative and quantitative requirements for freedom from biological hazard are not included in this International Standard, but it is recommended that reference be made to ISO 10993-1 and ISO 7405 for assessing possible biological or toxicological hazards. The testing of the corrosion behavior of metallic materials in dentistry is complicated by the diversity of the materials themselves, their applications and the environment to which they are exposed. Variation occurs between devices and within the same device during the exposure time. The type of corrosion behavior or effect can also vary with exposure time. Accordingly, it is not possible to specify a single test capable of covering all situations, nor is it a practical proposition to define a test for each situation. This International Standard, therefore, gives detailed procedures for test methods that have been found to be of merit as evidenced by considerable use. This second edition differs from the first edition by the addition of two new test methods. To supplement the existing static immersion test, a static immersion test with periodic analysis has been added. A major reason for the addition of this test is that the rate of corrosion of most dental metallic materials varies over time. Thus, the aim of this supplementary test is to provide information on this variation in the corrosion of a dental metallic material. A classification scheme to interpret the rate of corrosion of a tested material with time (i.e. steady, decreasing, increasing) was not included as part of the static immersion test with periodic analysis. It is intended to monitor the use of the test through appropriate working groups of ISO/TC 106 to ascertain whether a classification scheme is needed in a future revision of this International Standard. To supplement the sulfide tarnish test (cyclic immersion), a sulfide tarnish test (static immersion) has also been added to this second edition of ISO 10271. This test has been used successfully for many years to evaluate the corrosion of silver alloys. In addition, an informative annex (Annex A) is provided that sets out a procedure for each element of the test system such that a consistent approach can be taken for the development of further test methods. Equally, it is recognized that any element can represent only the current recommendation, but changes in the future are unlikely to change the framework. It is not the purpose of this International Standard to propose corrosion test methods for specific applications or to set limits as precise as those in the standard relating to the type of product and its application. SIST EN ISO 10271:2011

INTERNATIONAL STANDARD ISO 10271:2011(E) © ISO 2011 – All rights reserved 1 Dentistry — Corrosion test methods for metallic materials 1 Scope This International Standard provides test methods and procedures to determine the corrosion behavior of metallic materials used in the oral cavity. It is intended that the test methods and procedures in this International Standard be referred to in the individual International Standards specifying such metallic materials. This International Standard is not applicable to instruments and dental amalgam and appliances for orthodontics. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1042, Laboratory glassware — One-mark volumetric flasks ISO 1942, Dentistry — Vocabulary ISO 3585, Borosilicate glass 3.3 — Properties ISO 3696, Water for analytical laboratory use — Specification and test methods ISO 6344-1, Coated abrasives — Grain size analysis — Part 1: Grain size distribution test ISO 7183, Compressed-air dryers — Specifications and testing 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 1942 and the following apply. 3.1 breakdown potential Ep least noble potential at which pitting or crevice corrosion, or both, initiates and propagates 3.2 corrosion physicochemical interaction between a metallic material and its environment that results in a partial or total destruction of the material or in a change of its properties SIST EN ISO 10271:2011

ISO 10271:2011(E) 2 © ISO 2011 – All rights reserved 3.3 corrosion potential Ecorr open-circuit potential measured under either service conditions, or laboratory conditions that closely approximate service conditions 3.4 corrosion product substance formed as a result of corrosion 3.5 crevice corrosion corrosion associated with and taking place in or near a narrow aperture or crevice 3.6 current density value of electric current per unit surface area flowing through a conductor 3.7 dynamic immersion test test in which the sample is exposed to a corrosive solution under conditions of relative motion between sample and solution 3.8 electrode potential potential difference between the sample and a reference electrode 3.9 electrolyte solution or liquid that conducts an electrical current by means of ions 3.10 open-circuit potential Eocp potential of an electrode measured with respect to a reference electrode or another electrode when no current flows 3.11 pitting corrosion localized corrosion which results in pits 3.12 potentiodynamic test test in which the electrode potential is varied at a preprogrammed rate and the relationship between current density and electrode potential is recorded 3.13 potentiostatic test test in which the electrode potential is maintained constant 3.14 sample totality of material for one type being tested, the group of all such specimens 3.15 set subgroup of the specimens of a sample SIST EN ISO 10271:2011

ISO 10271:2011(E) © ISO 2011 – All rights reserved 3 3.16 specimen individual single example of an objec
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