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.
Tämän julkaisun valmistelusta Suomessa vastaa Metalliteollisuuden Standardisointiyhdistys ry, puh. 09 19 231 (vaihde).
Sisällysluettelo
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
5.1 Potentiostat
5.2 Electrode potential-measuring instrument
5.3 Current-measuring instruments
5.4 Temperature controller
5.5 Temperature-measurement instrumentation
5.6 Specimen holder
5.7 Test cell
5.8 Auxiliary electrode
5.9 Reference electrode
6 Specimens
7 Calibration of specimen temperature vs. solution temperature
8 Procedure
8.1 Preparation of reference electrodes
8.2 Preparation of specimen
8.3 Preparation of solution
8.4 Setting up the test
8.5 Ending test
9 Assessment of results
10 Test report
Annex A Guidelines for selecting the test parameters (informative)
Annex B Method of preventing a crevice attack (informative)
Annex C Potential difference of selected reference electrodes at 25 °C with respect to the standard hydrogen electrode (SHE) (informative)