Assessment of electrochemical methods used on corrosion of superduplex stainless steel

Kioshy S. de Assis (1) , Flavio V.V. de Sousa (1) , Marcelo Miranda (1) , Isabel C.P. Margarit-Mattos (1) , Oscar R. Mattos (1) , Vincent Vivier (2)

1 LNDC / UFRJ - Laboratório de Ensaios Não destrutivos, Corrosão e Soldagem
2 LISE - Laboratoire Interfaces et Systèmes Electrochimiques

This paper addresses the electrochemical parameters proposed in ISO 12732 standard that are used to quantify undesirable phases in a superduplex stainless steel. The relationship among these electrochemical parameters (listed as the maximum current and overall charges ratio during the activation and reactivation polarization curves) and the quantity of undesirable phases were evaluated. It was shown that ferrite is always preferentially corroded in that steel. For aged conditions, the undesirable phases were satisfactorily detected by Double Loop Electrochemical Potentiokinetic Reactivation. A new experimental protocol developed made possible the characterization of the attack occurring at each polarization range.

Mots clés: Stainless steel; Cyclic voltammetry; SEM; Polarization; Intergranular corrosion

Domaines: Autre

Kioshy S. de Assis, Flavio V.V. de Sousa, Marcelo Miranda, Isabel C.P. Margarit-Mattos, Oscar R. Mattos, et al.. Assessment of electrochemical methods used on corrosion of superduplex stainless steel. Corrosion Science, 2012, 59, pp.71-80. ⟨10.1016/j.corsci.2012.02.014⟩. ⟨hal-00788037⟩