Corrosion of metals and alloys. Electrochemical potentiokinetic reactivation measurement using the double loop method (based on Cihal's method) (ISO 12732:2006)
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ISO 12732:2006 specifies the method for measuring the degree of sensitization (DOS) in stainless steel and nickel-based alloys using the Double Loop Electrochemical Potentiokinetic Reactivation (DL-EPR) test (based on Cihal's method). The method may be used for the quantitative assessment of deleterious thermal effects resulting in the formation of alloy-element-depleted zones at grain boundaries or in the matrix. However, attention should be paid when testing heat-affected weld zones, due to possible non-uniform distribution of sensitized zones along the fusion lines. The results of the test can be used as an index to identify the potential susceptibility of stainless steel and nickel-based alloys to intergranular corrosion, pitting corrosion, and intergranular-stress corrosion cracking, but prediction of these corrosion modes depends on complementary specific testing. ISO 12732:2006 describes the general methodology and gives examples of suitable test exposure conditions for specific alloys.
Tämän julkaisun valmistelusta Suomessa vastaa Metalliteollisuuden Standardisointiyhdistys ry, puh. 09 19 231 (vaihde).
Sisällysluettelo
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
5.1 Scanning potentiostat
5.2 Electrode potential-measuring instrument
5.3 Current-measuring instruments
5.4 EPR test cell
6 Test solutions
7 Test specimen preparation
8 Procedure
9 Metallographic inspection
10 Evaluation of results
11 Test report
Annex A Flushed port cell and flushed electrode holder (informative)
Annex B Potential of selected reference electrodes at 25 °C with respect to the standard hydrogen electrode (SHE) (informative)
Annex C Suggested method for sensitizing test specimens (informative)
Annex D Correlation of Ir/Ip with the degree of grain-boundary sensitization, Pa (ASTM G108), QGBA and QGBL (informative)
ISO 643:2003 Steels -- Micrographic determination of the apparent grain size
ISO 8044:1999 Corrosion of metals and alloys -- Basic terms and definitions
ISO 643:2003 Steels -- Micrographic determination of the apparent grain size
ISO 8044:1999 Corrosion of metals and alloys -- Basic terms and definitions