Fast testing of ambient temperature pitting corrosion in type 2205 duplex stainless steel by bipolar electrochemistry experiments

• Main Authors: Yiqi Zhou, Dirk Lars Engelberg
• Format: Article
• Language: English
• Published: Elsevier 2020-08-01
• Series: Electrochemistry Communications
• Subjects: Duplex stainless steel; Pitting corrosion; Crevice corrosion; Bipolar electrochemistry; SEM/EDX
• Online Access: http://www.sciencedirect.com/science/article/pii/S1388248120301302

Commercial grade type 2205 duplex stainless steel is resistant to localised corrosion at room temperature. With the application of bipolar electrochemistry, pitting and crevice corrosion can be probed at room temperature, with corrosion pits nucleated in 0.1 M HCl within 15 s of exposure. The evolution of localised corrosion kinetics as a function of applied electrochemical potential is discussed. Pit nucleation occurred at the interface between ferrite and austenite, growing into the ferrite phase. Pits with lacy covers formed via selective dissolution of the ferrite.