Abstract
AbstractThe surface electrochemical corrosion activity of the economic lean duplex stainless steel LDX2101 was investigated in situ in chloride solution with a combination of long working distance microscope (LWDM) and electrochemical techniques. In addition, the site and chemical composition of the electrochemical active points on the specimen surface were also determined with integrated scanning electron microscope/energy dispersive X‐ray spectroscope (SEM/EDS) system. The results demonstrated that: (i) The reaction of α → Cr2N + γ2 precedes that of α → σ + γ2 when LDX2101 was aged at 700°C. (ii) The initiation sites of electrochemical active points could be determined by LWDM in combination with potentiostatic pulse technique (PPT). (iii) The sites of electrochemical active points were found to change from inclusions (MnS/Al2O3) to secondary austenite phase (γ2), with the increase of aging time at 700°C.
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