NF ISO 18089

January 2016

Standard Current

Corrosion of metals and alloys - Determination of the critical crevice temperature (CCT) for stainless steels under potentiostatic control

ISO 18089:2015 describes the procedure for determining the critical crevice temperature (CCT) for stainless steels under potentiostatic control. The principal advantage of the test is the rapidity with which the CCT can be measured in a single test procedure. The CCT, as determined in this International Standard, can be used as a relative index of performance, for example, to compare the relative performance of different grades of stainless steel. The test described in this International Standard is not intended to determine the temperature at which crevice corrosion will occur in service. This method is not intended for materials with critical pitting temperature (CPT) values below 20 °C measured in accordance with ISO 17864, when measured in the same test solution and at the same potential

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Main informations

Collections

National standards and national normative documents

Publication date

January 2016

Number of pages

19 p.

Reference

NF ISO 18089

ICS Codes

77.060 Corrosion of metals

Classification index

A05-172

Print number

International kinship

ISO 18089:2015

Sumary

Corrosion of metals and alloys - Determination of the critical crevice temperature (CCT) for stainless steels under potentiostatic control

ISO 18089:2015 describes the procedure for determining the critical crevice temperature (CCT) for stainless steels under potentiostatic control.

The principal advantage of the test is the rapidity with which the CCT can be measured in a single test procedure. The CCT, as determined in this International Standard, can be used as a relative index of performance, for example, to compare the relative performance of different grades of stainless steel.

The test described in this International Standard is not intended to determine the temperature at which crevice corrosion will occur in service.

This method is not intended for materials with critical pitting temperature (CPT) values below 20 °C measured in accordance with ISO 17864, when measured in the same test solution and at the same potential

Table of contents

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1 Domaine d'application
2 Références normatives
3 Termes et définitions
4 Principe
5 Matériel
6 Mode opératoire
7 Évaluation des résultats
8 Rapport d'essai
Annex A Exemples de raccordements de l'électrode
Annex B Représentation schématique de différents éléments initiateurs de l'effet de crevasses utilisés pour mesurer la température critique de corrosion caverneuse
Annex C Étalonnage de la température de l'éprouvette par rapport à la température de la solution en cas d'utilisation d'un porte-éprouvette
Annex D Potentiel des électrodes de référence sélectionnées, à 25 °C, par rapport à l'électrode normale à hydrogène (ENH)
Bibliographie

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