NF EN ISO 12732
Corrosion of metals and alloys - Electrochemical potentiokinetic reactivation measurement using the double loop method (based on Cihal's method)
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.
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.- Avant-proposiv
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1 Domaine d'application1
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2 Références normatives1
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3 Termes et définitions1
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4 Principe2
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5 Appareillage3
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6 Solutions d'essai5
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7 Préparation de l'éprouvette5
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8 Mode opératoire5
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9 Examen métallographique6
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10 Évaluation des résultats6
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11 Rapport d'essai7
- Annexe A (informative) Cellule à circulation sous joint et porte-électrode à circulation9
- Annexe B (informative) Potentiel à 25 °C d'électrodes de référence sélectionnées par rapport à l'électrode normale à hydrogène (ENH)12
- Annexe C (informative) Suggestion de méthode pour sensibiliser les éprouvettes13
- Annexe D (informative) Corrélation entre Ir/Ip et le degré de sensibilisation, Pa (ASTM-G 108), QGBA et QGBL14
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