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Ding J.,Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016 | Zhang Z.-M.,Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016 | Wang J.-Z.,Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016 | Wang J.-Q.,Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016 | Han E.-H.,Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016
Materials and Corrosion | Year: 2015

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. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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