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Corrosion behavior of different parts of the weld of 316L/52M/A508 dissimilar metal welded joint in simulated pressurized water reactor primary water
Author(s) -
Ding J.,
Zhang Z.M.,
Wang J.Z.,
Wang J.Q.,
Han E.H.
Publication year - 2015
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201508448
Subject(s) - materials science , x ray photoelectron spectroscopy , welding , scanning electron microscope , metallurgy , corrosion , dielectric spectroscopy , oxide , polarization (electrochemistry) , composite material , electrochemistry , chemical engineering , chemistry , electrode , engineering
The electrochemical behavior and oxide film structure of the weld of 316L/52M/A508 dissimilar metal welded joints were investigated via scanning electron microscopy (SEM), potentiodynamic polarization measurements, electrochemical impedance spectroscopy (EIS), and X‐ray photoelectron spectroscopy (XPS). The electrochemical measurements revealed that the weld materials could be arranged in descending order of protectiveness of the oxide film formed on their surface; that is, Alloy52Mw > Alloy52Mb > C52M > C308. The results of EIS and XPS analyses showed that the oxide films formed on these materials were duplex‐structured; this duplex structure consisted of a Cr‐rich (in 52M nickel‐based weld materials) or Cr/Fe‐rich (in C308 stainless steel weld materials) inner layer and a Ni/Fe‐rich (in 52M nickel‐based weld materials) or Fe‐rich (in 308 stainless steel weld materials) porous outer layer.