fig5

A review on pitting corrosion and environmentally assisted cracking on duplex stainless steel

Figure 5. Study of the passive film degradation of duplex stainless steel after anodic polarization at 900 and 1400 mV (vs. Ag/AgCl) in 1 M NaCl (aq). (A) During the polarization test, selective dissolution occurred on the ferrite phase and the austenite phase was corroded as well. (Reproduced with permission[43]. Copyright 2018, Elsevier). (B) The main composition was ferrite and austenite.(Reproduced with permission[43]. Copyright 2018, Elsevier). (C) The small diffraction peaks corresponded to multiple crystal oxides (Reproduced with permission[43]. Copyright 2018, Elsevier). (D) Chromium oxide is the major compound of crystal oxides. The random noise represents the nano-crystalline structure of the oxides. (Reproduced with permission[43]. Copyright 2018, Elsevier). (E and F) The X-Ray Fluorescence (XRF) data for Fe, Cr, Ni, and Mo after applying different anodic polarization at room temperature[44]. (Open access). (G) The degradation mechanism of 2,507 duplex stainless steel under the applied potential[44]. (Open access).

Microstructures
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