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The objective of this work is to investigate the magnetite-accelerated corrosion phenomenon of SA508 used as tubesheet material in simulated secondary side environments of pressurized water reactors through immersion and electrochemical tests. The presence of sulfate ions induced the fast growth of a corrosion product layer on SA508, and this phenomenon was accelerated when the SA508 was coupled to magnetite. From the perspective of electrochemical behavior, it was found that SA508 behaves as an anodic member in the coupling system with magnetite, resulting in an increased corrosion rate.

Magnetite-Accelerated Corrosion of SA508 Tubesheet Material and Its Effect on Steam Generator Tube Denting