EN ISO 17864:2008 PDF

Corrosion of metals and alloys - Determination of the critical pitting temperature under potientiostatic control (ISO 17864:2005)

Название (английский):

EN ISO 17864:2008

Corrosion of metals and alloys - Determination of the critical pitting temperature under potientiostatic control (ISO 17864:2005)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 21
Дата публикации:: 16 апреля 2008 г.
Издание:: CEN EN 17864 edition 1 version 1
ICS:: 77.060

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Описание (английский):

ISO 17864:2005 describes the procedure for determining the critical pitting temperature for stainless steels (austenitic, ferritic/austenitic, ferritic stainless steel) under potentiostatic control. The principal advantage of the test is the rapidity with which the critical pitting temperature can be measured in a single test. The critical pitting temperature, 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 pitting will occur in service.

Технические детали

Технический комитет: CEN/TC 262 - Metallic and other inorganic coatings
SKU: EN ISO 17864:2008

Abstract

Overview

EN ISO 17864:2008 (ISO 17864:2005) specifies a laboratory method for determining the critical pitting temperature (CPT) of stainless steels under potentiostatic control. The CPT is defined as the lowest temperature on the specimen surface at which stable, propagating pitting occurs under the specified test conditions. This method is rapid - allowing CPT measurement in a single ramped-temperature test - and is intended as a relative index of pitting resistance, not as a prediction of field service behavior.

Key topics and technical requirements

Scope and materials: Applies to stainless steels (austenitic, ferritic/austenitic (duplex), ferritic).
Test principle: Heat the test solution to increase specimen surface temperature at a controlled ramp rate while maintaining the specimen potential with a potentiostat; CPT is recorded when current density exceeds a specified value for 60 s (to exclude metastable pits).
Apparatus:
- Potentiostat capable of holding potential to within ±1 mV.
- High-impedance electrode potential measurement and current-measurement accuracy (~±2%).
- Reference electrode external to the cell connected via a Luggin capillary; typical types (Ag/AgCl, SCE) and their SHE potentials are referenced in the standard.
- Auxiliary electrode (e.g., platinum) with an area at least equal to the specimen area.
- Temperature controller and temperature-measurement instrumentation (solution temperature accuracy ±0.4 °C).
- Test cell and specimen holder constructed from inert materials (glass, PTFE, polycarbonate) and designed to prevent crevice corrosion (Annex B discusses flushed-port/flushed-holder approaches).
Specimen and cell geometry:
- Minimum exposed test area: 1 cm².
- Solution volume / specimen area ratio: at least 100 ml/cm².
- Luggin tip placement: not closer than ~2× tip diameter from the specimen.
Calibration: Account for temperature gradients by calibrating specimen surface temperature versus bulk solution (installing a probe

Overview

Key topics and technical requirements

Scope and materials: Applies to stainless steels (austenitic, ferritic/austenitic (duplex), ferritic).
Test principle: Heat the test solution to increase specimen surface temperature at a controlled ramp rate while maintaining the specimen potential with a potentiostat; CPT is recorded when current density exceeds a specified value for 60 s (to exclude metastable pits).
Apparatus:
- Potentiostat capable of holding potential to within ±1 mV.
- High-impedance electrode potential measurement and current-measurement accuracy (~±2%).
- Reference electrode external to the cell connected via a Luggin capillary; typical types (Ag/AgCl, SCE) and their SHE potentials are referenced in the standard.
- Auxiliary electrode (e.g., platinum) with an area at least equal to the specimen area.
- Temperature controller and temperature-measurement instrumentation (solution temperature accuracy ±0.4 °C).
- Test cell and specimen holder constructed from inert materials (glass, PTFE, polycarbonate) and designed to prevent crevice corrosion (Annex B discusses flushed-port/flushed-holder approaches).
Specimen and cell geometry:
- Minimum exposed test area: 1 cm².
- Solution volume / specimen area ratio: at least 100 ml/cm².
- Luggin tip placement: not closer than ~2× tip diameter from the specimen.
Calibration: Account for temperature gradients by calibrating specimen surface temperature versus bulk solution (installing a probe

EN ISO 17864:2008 PDF

Технические детали

Abstract

Overview

Key topics and technical requirements

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Abstract

Overview

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