EN ISO 12732:2008

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Test solutions
7 Test specimen preparation
8 Procedure
9 Metallographic inspection
10 Evaluation of results
11 Test report
Annex A (informative) - Flushed port cell and flushed
         electrode holder
Annex B (informative) - Potential of selected reference
         electrodes at 25 degree C with respect to the
         standard hydrogen electrode (SHE)
Annex C (informative) - Suggested method for sensitizing
         test specimens
Annex D (informative) - Correlation of I[r]/I[p] with the
         degree of grain-boundary sensitization, P[a]
         (ASTM G108), Q[GBA] and Q[GBL]

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.