Assessment of electrochemical methods used on corrosion of superduplex stainless steel

作者：de Assis Kioshy S; de Sousa Flavio V V; Miranda Marcelo; Margarit Mattos Isabel C P; Vivier Vincent; Mattos Oscar R^*

来源：Corrosion Science, 2012, 59: 71-80.

DOI：10.1016/j.corsci.2012.02.014

• Stainless steel
• Cyclic voltammetry
• SEM
• Polarization
• Intergranular corrosion

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.

• 出版日期2012-6