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In Situ Observation of Surface Electrochemical Activities of Lean Duplex Stainless Steel LDX 2101
Author(s) -
Li Xuyan,
Guo Lifang,
Han Dong,
Li Jin,
Jiang Yiming
Publication year - 2013
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201200131
Subject(s) - scanning electron microscope , electrochemistry , materials science , in situ , austenite , metallurgy , corrosion , microscope , duplex (building) , analytical chemistry (journal) , microstructure , electrode , composite material , chemistry , optics , physics , organic chemistry , chromatography , dna , biochemistry
The 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 → Cr 2 N + γ 2 precedes that of α → σ + γ 2 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/Al 2 O 3 ) to secondary austenite phase (γ 2 ), with the increase of aging time at 700°C.