EN 12923-1:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Advanced technical ceramics - Monolithic ceramics - Part 1: General practice for undertaking corrosion testsCéramiques techniques avancées - Céramiques monolithiques - Partie 1: Pratique générale destinée aux essais de corrosionHochleistungskeramik - Monolithische Keramik - Teil 1: Allgemeines zur Durchführung von KorrosionsprüfungenTa slovenski standard je istoveten z:EN 12923-1:2006SIST EN 12923-1:2007en81.060.30Sodobna keramikaAdvanced ceramicsICS:SIST ENV 12923-1:20001DGRPHãþDSLOVENSKI
STANDARDSIST EN 12923-1:200701-maj-2007

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12923-1December 2006ICS 81.060.99Supersedes ENV 12923-1:1997
English VersionAdvanced technical ceramics - Monolithic ceramics - Part 1:General practice for undertaking corrosion testsCéramiques techniques avancées - Céramiquesmonolithiques - Partie 1: Pratique générale destinée auxessais de corrosionHochleistungskeramik - Monolithische Keramik - Teil 1:Allgemeines zur Durchführung von KorrosionsprüfungenThis European Standard was approved by CEN on 25 November 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, 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.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12923-1:2006: E

Appropriate container and specimen holder materials for corrosion testing.17 A.1 Mineral acids, excluding hydrofluoric acid.17 A.2 Hydrofluoric acid (HF).17 A.3 Aqueous-based alkaline solutions.17 A.4 Molten metal alloys.17 A.5 Molten slags.18

Part 1: General practice for undertaking corrosion tests
Part 2: Oxidation test At the time of publication of this edition of Part 1, Part 2 was a European Prestandard. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, 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.

Appropriate in some
appropriate cases
B. Change of mass Appropriate, but Inappropriate Appropriate if non-
sometimes inadequate
slagging
C. Change of cross- Not always appropriate Appropriate Appropriate section when change is small
D. Change of strength Appropriate Might be
Appropriate if non-
appropriate if adherent
slagging; might be
material is removed appropriate if adherent
material is removed
E. Change of surface Appropriate for slight Usually inappropriate Usually inappropriate roughness corrosion
F. Change of hardness Appropriate Usually inappropriate Might be
appropriate if
non-slagging G. Change of Appropriate Usually inappropriate Appropriate corrodent composition
5.3 Method B: Mass change 5.3.1 Accurate determination of change in dry mass might not properly reflect the extent of attack as a result of either the adherence of solid surface deposits or the retention of corrosion products within porosity generated by corrodent penetration. A change in mass therefore indicates that some attack might have occurred, but other criteria need to be employed to quantify its overall effect on performance. 5.3.2 Assuming that the process of mass gain or mass loss is attributable to the test piece behaviour, accurate determination of change in dry mass relies on being able to minimize contact between the test piece and the apparatus in which it is housed for the duration of the corrosion test. If strong reaction occurs between the test piece surface and its support, a significant error in registered mass change might result. NOTE 1 It might be necessary to perform some preliminary tests to ensure that the supporting material is sufficiently non-reactive with the test material before conducting the required tests. In some atmospheres, for example in low oxygen content atmospheres at high temperatures, the evolution of volatile species from one test piece can interact with or contaminate adjacent test pieces. Cases of this type necessitate separately exposing each test piece to the corroding medium. NOTE 2 For the particular case of high temperature oxidation tests, further information is given in
ENV 12923-2 [1]. 5.3.3 Free circulation of corrodent around the test piece is required. If this is for any reason significantly reduced by the geometrical arrangement of test pieces and supporting apparatus, rates of corrosion might be reduced as the corroding species become consumed. A very high velocity of
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